Author Topic: 1977 cb750f2 (915cc)  (Read 240681 times)

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Offline tweakin

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1000 on: June 02, 2014, 07:54:06 AM »
Selling the Duc too?   Package deal?? [kidding]

Yep-  All bikes with the exception of the K1 and dirtbikes. 

Thanks for getting the bidding going. ;)


Offline flybox1

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1002 on: June 02, 2014, 10:09:36 AM »
dang....it'll be gone before i get to see this version of it in person. :-\
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

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Offline Blackfin5

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1003 on: June 02, 2014, 12:06:54 PM »
Tige, you are killing me!  I guess timing is everything.  If had not started my F1 Blaster, would have paid top $$ for the 915.  Still may throw my hat in the ring ;) - but it would sure help to know your "Buy It Now" price or your reserve.  PM me if willing to disclose.  It's one of my all time favorite builds on here.

Best of luck with the auction!

Offline madScientist

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1004 on: June 02, 2014, 01:57:05 PM »
This makes me sad...and yet kind of happy that I'm going to be bidding on the bike that inspired me to build mine...
You CAN do great things...with enough beer.


78 cb750f
http://forums.sohc4.net/index.php?topic=113293.0
70 CL350 Street Tracker / Cafe
http://forums.sohc4.net/index.php?topic=125641.0
83 KZ1100ltd
76 GL1000
71 Kaw H2 (to be built)
77 cb750A (sold)
74 cb125s (sold)

Offline cgarbe

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1005 on: June 05, 2014, 10:32:43 AM »
Your reserve has already been met?! There is no way you built that thing for less than $6k!
1975 Honda CB400F
1978 Honda CB750F

Offline Stev-o

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1006 on: June 05, 2014, 04:31:58 PM »
Your reserve has already been met?! There is no way you built that thing for less than $6k!

The motor alone was over $6K.  I say keep it as part of your IRA acct, will be worth $50K by then.
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline sazaver

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1007 on: July 17, 2014, 08:56:54 AM »
this is a steal my god 8k!

Offline SOHC4 Cafe Racer Fan

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1008 on: July 17, 2014, 05:58:17 PM »
this is a steal my god 8k!

Yes, indeed. Hope it went to a deserving buyer.
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline welard

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1009 on: September 03, 2014, 09:28:08 AM »
Hi Tweakin

Sorry for resurrecting this thread, I've only just become active on the forum and am doing a hell of a lot of reading in preparation for my project 76 CB 750 F.

I hope its ok if I ask you a couple of quick questions.....from the early posts, I notice that you fitted a set of CR 29 Carbs with pod filters and it seemed to just start up seemingly without any issues or at least that were mentioned regarding the dialing in of the carbs to work properly with pods.

Pods are something i would like to fit to my project, but after reading many threads on this and another forum, I really don't need the headache nor the tuning expense for someone else to do it. The people who are against them are quite vocal, but those who run them seem to be very quiet about them. Isd there anything you can impart that will help me make a decision. Just as a background...I'm planning on a full engine rebuild either either to 836 or 915 with new CR 31 carbs.

And secondly, what rear shocks did you end up fitting?

Once again sorry for resurrecting this thread, but I really found a lot in it that will be helpful for me in my project and have bookmarked it.

Also, I read you were turning your hand to photography and hope that is going well....I'm a professional photographer in Sydney, Australia... check me out at https://www.facebook.com/pages/Panos-Photography/697221903639782
and if you need any advice, happy to oblige in return.

Cheers

Pete

Offline MCRider

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1010 on: September 03, 2014, 09:37:03 AM »
If I may, while waiting on your answer, I have Pods on an 888cc and they start and run fine, seem to pull to the limit.  Granted the current engine has virtually no miles on it. But prior to this, I had an 888 for 15 years and about 50,000 to 60,000 miles on it. I never had any problems, except a slight gasp every now and then from side winds. Just enough to tell me they were there. VERY occasionally.

ITs been my observation that the bigger the engine the less the pods make a difference. IF tis a 500/550 or lower you'll lkely have problems.

My Mikuni VM29s came jetted from SUDCO for a 900cc engine. One jet change and some airscrew tweaking was all it took. Never touched them again.   ;D
« Last Edit: September 03, 2014, 09:38:52 AM by MCRider »
Ride Safe:
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1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline SOHC4 Cafe Racer Fan

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1011 on: September 03, 2014, 09:56:00 AM »
I have CR29s on my 836cc (CB750) and stock carburetors on my CB550 -- both with pod style filters.  Both start without issue and run smooth (steady idle, good power).  I am not advocating ditching your airbox.  I simply don't have the stock airbox on either bike.
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline Retro Rocket

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1012 on: September 03, 2014, 03:12:09 PM »
Just to clear a few things things up Welard, the pod threads you refer to, use stock carbs, Tweakins bike, Rons bike {MC rider} and CRF's bike all run different carbs. Honda designed its induction system as a whole, the stock keihins really don't work well with pods, anyone that tells you otherwise has probably never ridden a well tuned Honda/4. CR's/RS's are a race carbs by design and will run fine with pods, but you will still be susceptible to rain and wind, which will have an effect on how the bike runs, merely opening your legs a little when riding will produce a leaner condition, you will be best off using a dyno to tune any carb with pods {or any carb really} as it still takes time and if you aren't too sure how to do it yourself, you will be paying someone else to do it.... Just so you know its not an emotional subject for me, ALL modern race bikes and or factory built race bikes for 30 years or more  use airboxes, its the best way to guarantee a stable supply of air and cut out the turbulence that is problematic when tuning carbs, correct length velocity stacks are also part of the equation, i'm more into the tech side of things than the emotional side... Just a side note, the CR's and RS's would still be easier to tune and run better for street application, with an airbox, the problem on the old Honda's is that you can't fit a bigger airbox, so it also has its limitations {smaller limitations on the street than the track}, look at the size of the airbox on modern bikes, they have far more volume than our old bikes. Thats another reason you see old hotted up Honda's with modified airboxes to get more air in, there are quite a few examples on the forum.... Just something else to think about  ;). I'm running airboxes on all 3 bikes i have, a 900, a 970 and a 1000, all will have airboxes, Also looking into having a carbon fibre airbox made, just because i can, can't wait to smoke the pod guys... ;D ;D ;D  8) :P
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline SOHC4 Cafe Racer Fan

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1013 on: September 03, 2014, 03:39:02 PM »
Just to clear a few things things up Welard, the pod threads you refer to, use stock carbs, Tweakins bike, Rons bike {MC rider} and CRF's bike all run different carbs. Honda designed its induction system as a whole, the stock keihins really don't work well with pods, anyone that tells you otherwise has probably never ridden a well tuned Honda/4. CR's/RS's are a race carbs by design and will run fine with pods, but you will still be susceptible to rain and wind, which will have an effect on how the bike runs, merely opening your legs a little when riding will produce a leaner condition, you will be best off using a dyno to tune any carb with pods {or any carb really} as it still takes time and if you aren't too sure how to do it yourself, you will be paying someone else to do it.... Just so you know its not an emotional subject for me, ALL modern race bikes and or factory built race bikes for 30 years or more  use airboxes, its the best way to guarantee a stable supply of air and cut out the turbulence that is problematic when tuning carbs, correct length velocity stacks are also part of the equation, i'm more into the tech side of things than the emotional side... Just a side note, the CR's and RS's would still be easier to tune and run better for street application, with an airbox, the problem on the old Honda's is that you can't fit a bigger airbox, so it also has its limitations {smaller limitations on the street than the track}, look at the size of the airbox on modern bikes, they have far more volume than our old bikes. Thats another reason you see old hotted up Honda's with modified airboxes to get more air in, there are quite a few examples on the forum.... Just something else to think about  ;). I'm running airboxes on all 3 bikes i have, a 900, a 970 and a 1000, all will have airboxes, Also looking into having a carbon fibre airbox made, just because i can, can't wait to smoke the pod guys... ;D ;D ;D  8) :P

Well put.  It's a shame you can't find a good aftermarket airbox (Carbon Fiber would be awesome) for CR or RS carbs.  Steel Dragon Performance makes an aftermarket metal airbox, but I have not heard any reviews from anyone running their current model.  http://www.steeldragonperformance.com/air_boxes_7.html  If you don't have a viable stock airbox, this might be a decent option.
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline Retro Rocket

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1014 on: September 03, 2014, 03:45:40 PM »
Just to clear a few things things up Welard, the pod threads you refer to, use stock carbs, Tweakins bike, Rons bike {MC rider} and CRF's bike all run different carbs. Honda designed its induction system as a whole, the stock keihins really don't work well with pods, anyone that tells you otherwise has probably never ridden a well tuned Honda/4. CR's/RS's are a race carbs by design and will run fine with pods, but you will still be susceptible to rain and wind, which will have an effect on how the bike runs, merely opening your legs a little when riding will produce a leaner condition, you will be best off using a dyno to tune any carb with pods {or any carb really} as it still takes time and if you aren't too sure how to do it yourself, you will be paying someone else to do it.... Just so you know its not an emotional subject for me, ALL modern race bikes and or factory built race bikes for 30 years or more  use airboxes, its the best way to guarantee a stable supply of air and cut out the turbulence that is problematic when tuning carbs, correct length velocity stacks are also part of the equation, i'm more into the tech side of things than the emotional side... Just a side note, the CR's and RS's would still be easier to tune and run better for street application, with an airbox, the problem on the old Honda's is that you can't fit a bigger airbox, so it also has its limitations {smaller limitations on the street than the track}, look at the size of the airbox on modern bikes, they have far more volume than our old bikes. Thats another reason you see old hotted up Honda's with modified airboxes to get more air in, there are quite a few examples on the forum.... Just something else to think about  ;). I'm running airboxes on all 3 bikes i have, a 900, a 970 and a 1000, all will have airboxes, Also looking into having a carbon fibre airbox made, just because i can, can't wait to smoke the pod guys... ;D ;D ;D  8) :P

Well put.  It's a shame you can't find a good aftermarket airbox (Carbon Fiber would be awesome) for CR or RS carbs.  Steel Dragon Performance makes an aftermarket metal airbox, but I have not heard any reviews from anyone running their current model.  http://www.steeldragonperformance.com/air_boxes_7.html  If you don't have a viable stock airbox, this might be a decent option.

Yeah, i've seen them mate, far too small for my application, i touched on air box volume in my last post, the steel dragon one is a cool looking part but in all reality does nothing close to the job of a well designed airbox, they would probably be a better option to most pods though as they have velocity stacks built in... ;D ;)
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline SOHC4 Cafe Racer Fan

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1015 on: September 03, 2014, 03:49:02 PM »
Just to clear a few things things up Welard, the pod threads you refer to, use stock carbs, Tweakins bike, Rons bike {MC rider} and CRF's bike all run different carbs. Honda designed its induction system as a whole, the stock keihins really don't work well with pods, anyone that tells you otherwise has probably never ridden a well tuned Honda/4. CR's/RS's are a race carbs by design and will run fine with pods, but you will still be susceptible to rain and wind, which will have an effect on how the bike runs, merely opening your legs a little when riding will produce a leaner condition, you will be best off using a dyno to tune any carb with pods {or any carb really} as it still takes time and if you aren't too sure how to do it yourself, you will be paying someone else to do it.... Just so you know its not an emotional subject for me, ALL modern race bikes and or factory built race bikes for 30 years or more  use airboxes, its the best way to guarantee a stable supply of air and cut out the turbulence that is problematic when tuning carbs, correct length velocity stacks are also part of the equation, i'm more into the tech side of things than the emotional side... Just a side note, the CR's and RS's would still be easier to tune and run better for street application, with an airbox, the problem on the old Honda's is that you can't fit a bigger airbox, so it also has its limitations {smaller limitations on the street than the track}, look at the size of the airbox on modern bikes, they have far more volume than our old bikes. Thats another reason you see old hotted up Honda's with modified airboxes to get more air in, there are quite a few examples on the forum.... Just something else to think about  ;). I'm running airboxes on all 3 bikes i have, a 900, a 970 and a 1000, all will have airboxes, Also looking into having a carbon fibre airbox made, just because i can, can't wait to smoke the pod guys... ;D ;D ;D  8) :P

Well put.  It's a shame you can't find a good aftermarket airbox (Carbon Fiber would be awesome) for CR or RS carbs.  Steel Dragon Performance makes an aftermarket metal airbox, but I have not heard any reviews from anyone running their current model.  http://www.steeldragonperformance.com/air_boxes_7.html  If you don't have a viable stock airbox, this might be a decent option.

Yeah, i've seen them mate, far too small for my application, i touched on air box volume in my last post, the steel dragon one is a cool looking part but in all reality does nothing close to the job of a well designed airbox, they would probably be a better option to most pods though as they have velocity stacks built in... ;D ;)

Maybe that crafty bugger Devin (Cognitomoto) can whip up a larger than stock aftermarket CF airbox!
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline calj737

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1016 on: September 03, 2014, 03:58:29 PM »
If I could lay my hands on a complete 550 airbox assembly, I'd undertake it for myself. Regrettably, every bike in my stable has come with pods already and whacked frames, so even the mounting points are unknown to me.

May have to shop around and but a survivor bike  :D or borrow one from a member...
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline SOHC4 Cafe Racer Fan

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1017 on: September 03, 2014, 04:08:59 PM »
My last 550 stocker had a busted box. 

Cal, would you essentially use the stocker as a template for a larger box?
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline Retro Rocket

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1018 on: September 03, 2014, 04:38:15 PM »
Just to clear a few things things up Welard, the pod threads you refer to, use stock carbs, Tweakins bike, Rons bike {MC rider} and CRF's bike all run different carbs. Honda designed its induction system as a whole, the stock keihins really don't work well with pods, anyone that tells you otherwise has probably never ridden a well tuned Honda/4. CR's/RS's are a race carbs by design and will run fine with pods, but you will still be susceptible to rain and wind, which will have an effect on how the bike runs, merely opening your legs a little when riding will produce a leaner condition, you will be best off using a dyno to tune any carb with pods {or any carb really} as it still takes time and if you aren't too sure how to do it yourself, you will be paying someone else to do it.... Just so you know its not an emotional subject for me, ALL modern race bikes and or factory built race bikes for 30 years or more  use airboxes, its the best way to guarantee a stable supply of air and cut out the turbulence that is problematic when tuning carbs, correct length velocity stacks are also part of the equation, i'm more into the tech side of things than the emotional side... Just a side note, the CR's and RS's would still be easier to tune and run better for street application, with an airbox, the problem on the old Honda's is that you can't fit a bigger airbox, so it also has its limitations {smaller limitations on the street than the track}, look at the size of the airbox on modern bikes, they have far more volume than our old bikes. Thats another reason you see old hotted up Honda's with modified airboxes to get more air in, there are quite a few examples on the forum.... Just something else to think about  ;). I'm running airboxes on all 3 bikes i have, a 900, a 970 and a 1000, all will have airboxes, Also looking into having a carbon fibre airbox made, just because i can, can't wait to smoke the pod guys... ;D ;D ;D  8) :P

Well put.  It's a shame you can't find a good aftermarket airbox (Carbon Fiber would be awesome) for CR or RS carbs.  Steel Dragon Performance makes an aftermarket metal airbox, but I have not heard any reviews from anyone running their current model.  http://www.steeldragonperformance.com/air_boxes_7.html  If you don't have a viable stock airbox, this might be a decent option.

Yeah, i've seen them mate, far too small for my application, i touched on air box volume in my last post, the steel dragon one is a cool looking part but in all reality does nothing close to the job of a well designed airbox, they would probably be a better option to most pods though as they have velocity stacks built in... ;D ;)

Maybe that crafty bugger Devin (Cognitomoto) can whip up a larger than stock aftermarket CF airbox!

I've got 3 spare stock airboxes here i'm going to cut up and stitch together to see just how big is possible, there will be a different method of holding it together {no screws or nuts at the bottom of the airbox} to make it easier to remove....
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Offline calj737

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1019 on: September 03, 2014, 04:44:27 PM »
I would certainly start there. Then solicit input from Bwaller and Retro and others with road race wisdom on what/where mods should be. Hate to admit it, but it's been 30 years since I've seen the working model (last time I owned a CB) and I really can't get a good picture in my head for the installed and configured part.

I'm dead certain there will be far more to it than "bigger" is better. It's got be all about "bigger in the right way and places" just as cylinder head porting is.

You saw my email to 2Stroke. He's close enough (150 miles) that maybe I could dash up there, borrow a unit, and get some really detailed pictures and measurements. Then set about molding it up. I'd probably start with aluminum box as a prototype. Easy to bend, easy to weld, easy to machine. Then, if it seems right, I could do a vacuum molded version in CF perhaps. Probably have to rely on the boy at school to Vf it then autoclave it. Maybe talk to my powder coater about using his oven... Get a small vacuum press and then cure it at his place.

Something to think about.
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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1020 on: September 03, 2014, 04:59:00 PM »
I would certainly start there. Then solicit input from Bwaller and Retro and others with road race wisdom on what/where mods should be. Hate to admit it, but it's been 30 years since I've seen the working model (last time I owned a CB) and I really can't get a good picture in my head for the installed and configured part.

I'm dead certain there will be far more to it than "bigger" is better. It's got be all about "bigger in the right way and places" just as cylinder head porting is.

You saw my email to 2Stroke. He's close enough (150 miles) that maybe I could dash up there, borrow a unit, and get some really detailed pictures and measurements. Then set about molding it up. I'd probably start with aluminum box as a prototype. Easy to bend, easy to weld, easy to machine. Then, if it seems right, I could do a vacuum molded version in CF perhaps. Probably have to rely on the boy at school to Vf it then autoclave it. Maybe talk to my powder coater about using his oven... Get a small vacuum press and then cure it at his place.

Something to think about.

Since we are talking about air/fuel issues, maybe Mike Rieck could offer some pearls of wisdom into design and improvements over the stocker.  Maybe your designer in training can 3d design it and do airflow computer simulations and then 3d print a prototype for the molds.  Damn skippy!
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Offline calj737

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1021 on: September 03, 2014, 05:42:14 PM »
Unfortunately, he's not in engineering design, he's in industrial design; they styling aspect of things. Wants to be the next Chip Foose and Massimo Tamborini rolled into one.
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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1022 on: September 03, 2014, 06:11:38 PM »
I have looked at this numerous times, at least for my 550 racebike. On a CB550/550 the stock plenum is tiny and the attached airbox is full of filter. It obviously works, but cannot be easily expanded because of the rear frame rails. In my case the carbs are wider and inclined, but I have open space behind the rails. I think it would need to be in multiple pieces and I always just "give up". I doubt the shape needs to be complicated, but am not sure what the "inside" of the box should be like, probably a lower air intake section somewhat separate from the upper part. It's important that the V-stack bellmouthes have plenty of open space and undisturbed air. I'd like some sort of snorkel towards the front for cooler air intake. Oh I give up again!  ::)

Cal I likely have 500 airbox parts I can send you if you want to take a peak at one. Let me know, racing this weekend then I could ship it out.

Offline welard

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1023 on: September 03, 2014, 06:23:08 PM »
Thanks once again for the input guys.

In all probability I will be using the CR carbs which Retro says lend themselves a little better towards pods, but stock box provides a higher level of intake air stability.

Before posting I had already decided that the stock box would be my way to go mainly because I don't need the headache or expense as I mentioned, and my thoughts were turning to how to make that thing look better, in amongst all the nice bits that I'm planning on using.

Hey Retro, sorry I wasn't implying that anyone was emotional about the topic on this forum.....I actually started reading on another forum and the guys over there were dropping F bombs and calling each other offensive names about this topic.

Unlike here where its quite civilized and dignified-ish....

Offline calj737

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Re: 1977 cb750f2 (915cc) For Sale
« Reply #1024 on: September 03, 2014, 06:44:43 PM »
I think I've located a complete bike and assemblies just up the road from thru another member. But I will be soliciting input for mods and suggestions if I undertake this in any meaningful way towards making them for others.
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis