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Author Topic: 1976 CB750F - first bike, first build - mild cafe  (Read 36145 times)

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Online seanbarney41

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #175 on: April 30, 2016, 10:15:08 AM »
Take the springs off the shocks, put the shocks back on the bike, and compress the shock to the bumpstops is the correct way to check clearance.  You may be able to space or obtain a slightly larger bumpstop.  Longer shocks will decrease rake and trail which is sometimes ok but you gotta do the math...or be prepared to find out the hard way
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Offline riffman12

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #176 on: May 15, 2016, 09:34:21 PM »
OK been a while since an update. I've been back and fourth with brake lines, tail lights etc. so this is where I'm at. If anyone sees anything that looks wrong, please let me know!

bobbed front fender and front brakes all finished:




Rear brakes all finished:




chain, turn signals, and side plate mount installed:




waiting for my blade fuse holder from HondaMan then it's time for tuning. While waiting for that, I noticed this. Anyone know why I would have one green wire dangling here?




Also installed new NGK plug caps so the bike is all ready to run as soon as I have the fuse box in. If anyone has a good tuning guide that would be great! Not really sure what to do with the air screws with the K&N filter and carpy exaust.
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Offline SOHC4 Cafe Racer Fan

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #177 on: May 16, 2016, 10:15:49 AM »
You might want to move your license plate holder to the right side of the bike.  Otherwise, you might clip your leg when you are pushing the bike around (dismounted). Ask me how I know.
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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 riffman12

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #178 on: May 16, 2016, 11:08:44 AM »
haha good tip, I'll try that out. My only worry is that my exhaust will blast the back of my plate then  ;D
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Offline SOHC4 Cafe Racer Fan

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #179 on: May 16, 2016, 11:21:09 AM »
Good point.  I've learned to live with mine on the left, and I use a similar pipe, too.
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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 Jerry Rxman Griffin aka MuthaF'er

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #180 on: May 16, 2016, 11:49:36 AM »
The extra green is just a spare ground. We'd all probably like to know what Honda initially had in mind.

Good job on the fender.   
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As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline riffman12

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #181 on: May 20, 2016, 09:02:30 AM »
update:

I had a little tab welded up for my LED tail light. It's angled just enough that the light will be more visible than if it were on top of my seat. It doesn't look pretty right now, but I think once painted all will be OK:




and with the light mocked up:




what do you guys think?

Also got my HondaMan fuse block in the mail, installed that. So the plan is tuning tomorrow, test ride and more tuning on Sunday. Then if all goes well, the seat and side covers will be off to paint next week  ;D
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Offline riffman12

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #182 on: May 21, 2016, 12:52:26 PM »
Anyone have a quick guide on carb syncing with gauges?

I know the top adjusters are the major thing you change, but im pretty sure mine are close. From that point do i just fiddle with mixture screws?
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #183 on: May 21, 2016, 03:04:26 PM »
Get all 4 flowing as close as possible. Get your jetting as close as possible including the screws. Take it to the dyno.
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As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline riffman12

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #184 on: May 21, 2016, 06:40:18 PM »
OK cool. Got it running much better today. Once warm it starts on the first kick. Sync gauges are all very close together. I'm aiming to do a little test ride tomorrow to do some higher throttle tests.

This is after idling / gauge syncing / little revs here and there:




Specs:

1976 CB750F
Carpy 4 into 1 exhaust (with baffle)
stock airbox with K&N filter
115 main jets (105 is stock)
stock 42 pilots
stock needle position
air screws were 3/4 turn out (1 turn out is stock)


I'm pretty new to carb tuning. How does this look for idle readings?
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Offline flybox1

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #185 on: May 24, 2016, 09:48:09 AM »
After vacuum sync is done, mixture screws are set independently, based on plug color.  Not by idle sound.
Looking good.
Pics of how  you mounted your LED stop/tail light?
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'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

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Offline riffman12

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #186 on: May 25, 2016, 12:51:27 PM »
sort of hard to see, but this is how the LED strip sits. It was taped on for the test run, but will be properly mounted once the seat is painted.

My friend behind me said it was quite dim in daylight, but I'm hoping that just because of the low voltage / charging problem.

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Offline SOHC4 Cafe Racer Fan

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #187 on: May 25, 2016, 04:50:31 PM »
Make sure it is visible enough in sunshine, because that's what you'll be riding in most of the time.  You don't want to get rear-ended in LA (or any other) traffic.

Your painter should be able to body fill and blend the seat to the light.
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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 Thousandson

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #188 on: May 27, 2016, 11:46:38 AM »
Looks great. One thing I found out on my 750SS 78', when I did clubman bars. It put me really far forward, great attack position, feels like I am part of the bike. But I had to roll the bars pretty far forward just so they didn't hit the tank. It looks like you did the same thing, I just can't ride for long long distances. I traded out to drag bars, it was a compromise.
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Offline SOHC4 Cafe Racer Fan

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #189 on: May 27, 2016, 12:42:27 PM »
Quote from: Thousandson on May 27, 2016, 11:46:38 AM
Looks great. One thing I found out on my 750SS 78', when I did clubman bars. It put me really far forward, great attack position, feels like I am part of the bike. But I had to roll the bars pretty far forward just so they didn't hit the tank. It looks like you did the same thing, I just can't ride for long long distances. I traded out to drag bars, it was a compromise.

A nice alternative are the Tommaselli Condor Clubmans which are adjustable.  You can adjust the bars to a zero or even positive angle because the attachment point remains static.  They are pricier than a standard clubmans.  The adjustment points are indexed and have a LARGE allen bolt so they do not move even when applying lots of force.



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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

Online seanbarney41

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #190 on: May 27, 2016, 01:20:49 PM »
Quote from: Thousandson on May 27, 2016, 11:46:38 AM
Looks great. One thing I found out on my 750SS 78', when I did clubman bars. It put me really far forward, great attack position, feels like I am part of the bike. But I had to roll the bars pretty far forward just so they didn't hit the tank. It looks like you did the same thing, I just can't ride for long long distances. I traded out to drag bars, it was a compromise.
yup...standard clubmans dont really work with these bikes.  They came about for 1960s twins and singles raced in sportsman classes
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Offline riffman12

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #191 on: July 10, 2016, 07:05:45 PM »
so after almost exactly a year, this project is finally finished. Rode it all day today, high speed runs, twisties, around town. So much fun to ride!

Huge thank you to all of you who helped me through the way. Couldn't have done it without all of you. Here's some pics:











I'm sure it's not completely done. More things will come up, but for now it's just where I want it.  :D
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Offline calj737

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #192 on: July 10, 2016, 07:13:36 PM »
Great looking bike!
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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

Offline SOHC4 Cafe Racer Fan

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #193 on: July 10, 2016, 08:47:52 PM »
It came out great.  Glad you got the seat/taillight sorted.
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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 Yozzer74

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #194 on: July 15, 2016, 10:06:09 AM »
Bike looks great how was the fitment of the exhaust pipe
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Offline riffman12

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #195 on: July 25, 2016, 10:39:25 AM »
Thanks guys!

I'm still having a bit of wobble in the outside rim of the front comstar. I've had it up to 85mph and there is still no shake or anything through the bars, so I'm hoping the wheel is just a bit out of round (and balanced properly). Brake rotors are still dead straight so there is no movement at the hub. Is this normal for comstars?

Quote from: Yozzer74 on July 15, 2016, 10:06:09 AM
Bike looks great how was the fitment of the exhaust pipe

Thank you! the exhaust can be a bit of a pain to get all 4 headers lined up with the head. Just takes a bit of muscle. Once it's in it fits the bike really well.


Here's a recent shot of the bike:

« Last Edit: July 25, 2016, 11:46:08 AM by riffman12 »
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Online seanbarney41

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #196 on: July 25, 2016, 12:36:18 PM »
My comstar does exactly that...visual wobble at speeds of about 30 to 50, above 50 you can't see it, no affect on handling or how the bike rides
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Offline SOHC4 Cafe Racer Fan

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #197 on: July 25, 2016, 06:44:57 PM »
Trippy!
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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

Online seanbarney41

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #198 on: July 25, 2016, 06:56:25 PM »
every spoked wheel I have ever had did similar except some could be felt and did affect handling
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Offline Retro Rocket

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Re: 1976 CB750F - first bike, first build - mild cafe
« Reply #199 on: July 25, 2016, 11:15:52 PM »
Quote from: seanbarney41 on July 25, 2016, 06:56:25 PM
every spoked wheel I have ever had did similar except some could be felt and did affect handling

Sean, was that before or after dropping acid...?   ;D :P
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750 K2 1000cc
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