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Author Topic: 1973 CB350F "Modest Original" build  (Read 103376 times)

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Offline iiAtlas

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Re: 1973 CB350F "Modest Original" build
« Reply #525 on: February 01, 2017, 04:23:50 PM »


Finally, finally, FINALLY!  She is done.  And running absolutely beautifully!  I've been in hiding for the past few days contemplating whether to post my most recent revelation, the one which allowed us to finish this bike up.  I will give you all one hint....chapter IV...



Whoever can guess what were we're doing wrong wins...well...a running bike  ::)  Anyways here she sits happily waiting for her owner to pick her up.



The quick disconnect install also went well.

Closed:


Open:


And installed:


I checked to make sure it wasn't impeding flow or anything and we look all good there.  It is a real bugger to get on under the tank, but it is worlds better than dumping gas everywhere...there is a latched release on the bottom so it shouldn't come apart unbeknownst to the rider.

Anyways, very happy to have this little thing back on the road!!  And that much more excited to finish my 350 Four.  She's up next, I promise you!
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Offline grcamna2

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Re: 1973 CB350F "Modest Original" build
« Reply #526 on: February 01, 2017, 05:42:15 PM »
That's great Atlas,
I'm glad you followed-through on the vintage Honda 350 twin rather than 'just enough to get it running and out the door'  ::) as I've seen So many PO's do to 350 twins;nice work.I imagine you might have had the choke in the wrong position for running when warmed up causing your rich running problem? just a guess,it happens.
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75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline 540nova

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Re: 1973 CB350F "Modest Original" build
« Reply #527 on: February 02, 2017, 03:58:59 AM »
You can make those hoses longer for easier access, just above the carbs. Having them that short is a pain to access the quick disconnect.


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Offline iiAtlas

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Re: 1973 CB350F "Modest Original" build
« Reply #528 on: February 02, 2017, 07:18:11 AM »
Quote from: grcamna2 on February 01, 2017, 05:42:15 PM
That's great Atlas,
I'm glad you followed-through on the vintage Honda 350 twin rather than 'just enough to get it running and out the door'  ::) as I've seen So many PO's do to 350 twins;nice work.I imagine you might have had the choke in the wrong position for running when warmed up causing your rich running problem? just a guess,it happens.

Winner, winner, winner! So embarrassing..but even reading and trying to understand I just couldn't wrap my head around it.  The only way I was able to "get it" and finish up the bike was to read along that chapter in the manual with the air box removed to visualize the choke action.  With the choke in the "Open" position, the choke valve is OPEN, this is the natural run state for the bike.  With the engine NOT being choked for air.





With the choke in the CLOSED position, the choke valve is CLOSED and the engine is getting restricted air.  This leads to a richer fuel mixture, good for first starting the bike (but not for prolonged running!!).





Anyways...with a better understanding of that system we were able to confirm that the biggest issue with the bike was indeed the human behind the wrench.   :-\  But I am happy to report that with this newfound knowledge we we're able to tune the bike sans-problem.  She is running like a rocket!  The fixes we did were all in benefit of the final product.  The new ignition will allow the owner more freedom from maintenance (and the old points were shot), the spark plug caps were at their resistance limit, the carbs had mismatched jets and one was completely locked with varnish-like fuel.  The quick disconnect is a nice improvement (and yes 540nova slightly longer lines would've been a better idea!), as is the battery tender.  The new tires are totally awesome!!  We definitely took the long way around but I think the new owner is going to be really, really happy when he gets this ol girl back.  She feels like a totally new bike.

PS I think the root of the choke confusion comes from A) a previous lack of complete understanding of the system (I though choke increased airflow...d'oh!) and B) the "Enrichener" mechanism on our airheads which is push DOWN to engage, the opposite of this choke system.
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Offline 540nova

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Re: 1973 CB350F "Modest Original" build
« Reply #529 on: February 02, 2017, 08:08:30 AM »
Mikuni calls their chokes "enricheners", because with the choke on/closed, it enrichens the air / fuel ratio.


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Offline iiAtlas

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Re: 1973 CB350F "Modest Original" build
« Reply #530 on: February 02, 2017, 08:37:21 AM »
Quote from: 540nova on February 02, 2017, 08:08:30 AM
Mikuni calls their chokes "enricheners", because with the choke on/closed, it enrichens the air / fuel ratio.


Sent from my iPhone using Tapatalk

An "enrichener" is a different method of air / fuel ratio altering though, no?  A choke chokes the air, and enrichener increases the fuel (to untouched air).  Or so this is what I thought from my research.  (https://forums.bmwmoa.org/showthread.php?34090-Bing-Carb-Enricher-Choke-Demo)
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Offline iiAtlas

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Re: 1973 CB350F "Modest Original" build
« Reply #531 on: February 02, 2017, 08:47:49 AM »
Quote from: calj737 on February 02, 2017, 08:46:25 AM
same-same. The only way to enrich fuel mixture is to increase the ratio of fuel to air. So, either restrict the air, or increase the fuel. Either method you're enriching.

Yes same net result but different mechanism.  Anyways..GLAD to have this bike running and happy to further understand the choke.  Now back to the 350 Four!
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Offline grcamna2

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Re: 1973 CB350F "Modest Original" build
« Reply #532 on: February 02, 2017, 09:49:16 AM »
Atlas,You might mentioned to the owner that  he would benefit taking the bike out wide-open and 'seeing how fast it will go'..   :) To 'blow out' all that carbon that got in there from testing it w/ the choke on.
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75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline iiAtlas

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Re: 1973 CB350F "Modest Original" build
« Reply #533 on: February 02, 2017, 09:51:06 AM »
Quote from: grcamna2 on February 02, 2017, 09:49:16 AM
Atlas,You might mentioned to the owner that  he would benefit taking the bike out wide-open and 'seeing how fast it will go'..   :) To 'blow out' all that carbon that got in there from testing it w/ the choke on.

Smart  8)
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Offline grcamna2

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Re: 1973 CB350F "Modest Original" build
« Reply #534 on: February 02, 2017, 09:53:14 AM »
Quote from: iiAtlas on February 02, 2017, 09:51:06 AM
Quote from: grcamna2 on February 02, 2017, 09:49:16 AM
Atlas,You might mentioned to the owner that  he would benefit taking the bike out wide-open and 'seeing how fast it will go'..   :) To 'blow out' all that carbon that got in there from testing it w/ the choke on.

Smart  8)

Unless he wants you to do that  ;D
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75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline SOHC4 Cafe Racer Fan

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Re: 1973 CB350F "Modest Original" build
« Reply #535 on: February 02, 2017, 10:20:22 AM »
85 mph in second gear or you have to wear this. . .
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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 MoMo

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Re: 1973 CB350F "Modest Original" build
« Reply #536 on: February 02, 2017, 02:32:55 PM »
Quote from: calj737 on February 02, 2017, 10:06:14 AM
Quote from: grcamna2 on February 02, 2017, 09:49:16 AM
Atlas,You might mentioned to the owner that  he would benefit taking the bike out wide-open and 'seeing how fast it will go'..   :) To 'blow out' all that carbon that got in there from testing it w/ the choke on.
It had better exceed 80MPH in 2nd gear too else, we will rat you out as being a second-rate mechanic.  >:(





I agree.........80 in 2nd or else. ::)
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Offline grcamna2

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Re: 1973 CB350F "Modest Original" build
« Reply #537 on: February 02, 2017, 02:47:52 PM »
I think the CL350 may do like 90(not 150  :D) in 5th.. w/ it's larger(than a CB) stock rear sprocket;it would be interesting to know how it runs up there at redline in 5th w/ that ignition work,etc. you did to it.
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75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline MoMo

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Re: 1973 CB350F "Modest Original" build
« Reply #538 on: February 02, 2017, 05:10:18 PM »
Quote from: grcamna2 on February 02, 2017, 02:47:52 PM
I think the CL350 may do like 90(not 150  :D) in 5th.. w/ it's larger(than a CB) stock rear sprocket;it would be interesting to know how it runs up there at redline in 5th w/ that ignition work,etc. you did to it.



C'mon man, Bill, you know in can do 80 in second, 110 third, 130 fourth and 150 in fifth.   Ask The WildeOne, he'll vouch for it
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Offline grcamna2

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Re: 1973 CB350F "Modest Original" build
« Reply #539 on: February 02, 2017, 05:50:13 PM »
Quote from: MoMo on February 02, 2017, 05:10:18 PM
Quote from: grcamna2 on February 02, 2017, 02:47:52 PM
I think the CL350 may do like 90(not 150  :D) in 5th.. w/ it's larger(than a CB) stock rear sprocket;it would be interesting to know how it runs up there at redline in 5th w/ that ignition work,etc. you did to it.



C'mon man, Bill, you know in can do 80 in second, 110 third, 130 fourth and 150 in fifth.   Ask The WildeOne, he'll vouch for it

Did that former member 'Wilde' really think that his CB350F could do 80 in 2nd ?  :o :D
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75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline SOHC4 Cafe Racer Fan

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Re: 1973 CB350F "Modest Original" build
« Reply #540 on: February 02, 2017, 06:13:25 PM »
Quote from: grcamna2 on February 02, 2017, 05:50:13 PM
Quote from: MoMo on February 02, 2017, 05:10:18 PM
Quote from: grcamna2 on February 02, 2017, 02:47:52 PM
I think the CL350 may do like 90(not 150  :D) in 5th.. w/ it's larger(than a CB) stock rear sprocket;it would be interesting to know how it runs up there at redline in 5th w/ that ignition work,etc. you did to it.



C'mon man, Bill, you know in can do 80 in second, 110 third, 130 fourth and 150 in fifth.   Ask The WildeOne, he'll vouch for it

Did that former member 'Wilde' really think that his CB350F could do 80 in 2nd ?  :o :D

Actually, I believe he claimed 85 mph in 2nd gear.
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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 grcamna2

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Re: 1973 CB350F "Modest Original" build
« Reply #541 on: February 02, 2017, 06:32:34 PM »
Must've been running nitrous..  ::) through his oxygen mask.
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75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline MoMo

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Re: 1973 CB350F "Modest Original" build
« Reply #542 on: February 02, 2017, 09:05:30 PM »
Quote from: CB750 Cafe Racer Fan on February 02, 2017, 06:13:25 PM
Quote from: grcamna2 on February 02, 2017, 05:50:13 PM
Quote from: MoMo on February 02, 2017, 05:10:18 PM
Quote from: grcamna2 on February 02, 2017, 02:47:52 PM
I think the CL350 may do like 90(not 150  :D) in 5th.. w/ it's larger(than a CB) stock rear sprocket;it would be interesting to know how it runs up there at redline in 5th w/ that ignition work,etc. you did to it.



C'mon man, Bill, you know in can do 80 in second, 110 third, 130 fourth and 150 in fifth.   Ask The WildeOne, he'll vouch for it

Did that former member 'Wilde' really think that his CB350F could do 80 in 2nd ?  :o :D

Actually, I believe he claimed 85 mph in 2nd gear.



My bad (one of those horrible hip phrases I despise). You're correct, it was 85-
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Offline RAFster122s

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Re: 1973 CB350F "Modest Original" build
« Reply #543 on: February 03, 2017, 12:43:44 AM »
He may have installed a kmh instrument to achieve his 80...
He had issues with math or truth...take your pick.  Bet he could tell a mean fishing story too!
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David- back in the desert SW!

Offline SOHC4 Cafe Racer Fan

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Re: 1973 CB350F "Modest Original" build
« Reply #544 on: February 03, 2017, 06:05:07 AM »
Quote from: RAF122S on February 03, 2017, 12:43:44 AM
He may have installed a kmh instrument to achieve his 80...
He had issues with math or truth...take your pick.  Bet he could tell a mean fishing story too!

If he was retelling riverfever's squirrel hunting foray, the squirrel would have been the size of a Sasquatch.
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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 iiAtlas

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Re: 1973 CB350F "Modest Original" build
« Reply #545 on: February 03, 2017, 02:42:09 PM »
Haha! You guys are crazy, will be hard to test those speeds in downtown Manhattan!!  She feels quick all right, and a damn nick quicker than when she came in!
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Offline grcamna2

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Re: 1973 CB350F "Modest Original" build
« Reply #546 on: February 03, 2017, 03:54:08 PM »
Quote from: iiAtlas on February 03, 2017, 02:42:09 PM
Haha! You guys are crazy, will be hard to test those speeds in downtown Manhattan!!  She feels quick all right, and a damn nick quicker than when she came in!

Wait til the weather gets nice and take a good blast on the Interstate.
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75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline iiAtlas

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Re: 1973 CB350F "Modest Original" build
« Reply #547 on: February 20, 2017, 08:46:02 AM »
Morning folks!  Back from a couple week trip.  I am dying to get this motor put back together.  Time to get cleaning!
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Offline MoMo

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Re: 1973 CB350F "Modest Original" build
« Reply #548 on: February 20, 2017, 07:58:12 PM »
Vacation?   ...Larry
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Offline grcamna2

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Re: 1973 CB350F "Modest Original" build
« Reply #549 on: February 20, 2017, 09:50:57 PM »
Glad to hear you back Atlas.
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75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.
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