Topic: 26mm CR Specials on a CB400F

[turboguzzi]

hei rudi

zehr cool stuff,

when you are back from holidays, open your own thread, your bikes are worth it and its not nice kidnapping dave's thread...

like your 500/590, but with all that parts and work, why CV carbs?

would also be great to see some shots of the porting, cant really imagine how the stock seat can accept a + 1.5mm hole!

[MaaseyRacer]

Does anyone have the photos that were listed at beginning of this thread?  I would love to see what was done, I now have a set of these for my CB350, and it looks like they are going to be quite interesting to set up.  Anyone have any jetting recommendations for a CB350F with 26mm CR specials and a MC again exhaust?

[davesprinkle]

Sorry for the issues with the pics.  I haven't kept my photobucket account active.  Anyway, I've gone back and edited my posts, deleting the links to photobucket and uploading the images directly to the forum.

Regarding fitment of these carbs to your 350, I'd start with the jetting I used for my 450.  I will say this: these carbs run better with more displacement.  I put my carb rack on a stock displacement 400 and I found that engine speed at which the bike would tolerate full throttle was about 1000 to 1500 rpm higher for the 400 than for my 450.  The 450 will tolerate full throttle if rpm is greater than 6500 -- the 400 will tolerate full throttle if rpm is > 7500.  Going even smaller in displacement will make the problem worse -- it might just drive the full-throttle point so high in the engine-speed range that you'll never practically be able to get to wide-open throttle.

Here's another gratuitous trumpet shot.

[Blackhorse]

Dave,

Where did you obtain the monoposto seat assembly. I'd like to do something similar to my '75 CB550F

[davesprinkle]

I designed the shape in Solidworks and had a good friend cut the plug out of modeling foam on an NC mill.  A composites guy made a mold from which was created the final part in fiberglass.  I cut the stock seat pan in half and glassed the cowl to the front half of the seat pan, thus keeping the stock hinges and latch.

[turboguzzi]

I designed the shape in Solidworks and had a good friend cut the plug out of modeling foam on an NC mill.  A composites guy made a mold from which was created the final part in fiberglass.  I cut the stock seat pan in half and glassed the cowl to the front half of the seat pan, thus keeping the stock hinges and latch.

cool, are you in the design industry?

TG

[davesprinkle]

I designed the shape in Solidworks and had a good friend cut the plug out of modeling foam on an NC mill.  A composites guy made a mold from which was created the final part in fiberglass.  I cut the stock seat pan in half and glassed the cowl to the front half of the seat pan, thus keeping the stock hinges and latch.

cool, are you in the design industry?

TG

No, I'm an electronics engineer.

[Speedy Siegl Racing]

I am resurrecting this thread because I was able to relocate the throttle pulley without making a lot of modifications and new parts! I had to cut the CR throttle pulley apart from the assist spring to allow it to fit between the carbs. Then I had to cut the push cable part of the pulley off so it would clear the choke linkage for the #1 carb.
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I then had to mill a pocket to drill a pin hole through the pulley and pin it.
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