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Discussion Starter · #1 ·
Hello,

This is my first post here, but have used this forum throughout my build (so much good info!). I'm finishing up a 76' CB500t build. Bought the bike as a pile of parts after another guy attempted a cafe build on it. I have gone completely though every part of the bike including the engine, fuel and electrical systems but cannot get this bike to run smoothly in the lower rpms. The bike does have pod filters and I understand the challenges with CV carbs... but I figured I could still use the pods and have a somewhat rideable bike.

What I've done so far:
complete tear down and cleaning of the carbs
Bench Sync the Carbs
Sync both throttle cables
Increased the main jet to 155... have also tried 150s and 160s (stock was 145)
Adjusted and dialed in the timing
***The Engine is from a CL450***

The bike is running Uni pod filters with the stock headers and 12" shorty mufflers. I re-packed the mufflers and installed a baffle in hopes of more back pressure on the engine... This helped a bit.

Im seeing very poor and sporadic throttle response between 1000-3000 rpm. She idles fine...

Any thoughts/advice would be much welcomed! attached a few pics of the bike as well :)
 

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Moved to DOHC fuel section.

Your symptoms sound like an issue with the slow jets. You're not going to fix it by changing the main jets. Folks with more experience with the DOHC bikes will be along with more on that. In case you haven't already seen this, even though it refers to a different bike the fundamentals still apply:

https://www.hondatwins.net/forums/6...4-cb400-cv-carbs-pods-how-make-them-work.html

And, as long as you're here:

https://www.hondatwins.net/forums/23-member-introductions/121120-critical-read-before-posting.html

Welcome to the group.

Nice bike.
 

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You're going to have a hell of a time tuning the CV carbs to run with pods. They don't do well with pods at all and run best with the stock air box.

Extending the carb intake to create an air tunnel of sorts may help as per the thread Jim referred to.

But honestly you're in for one frustrating experience trying to tune the carbs to run on pods. Might be better off running with velocity stacks instead.
 

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The PO of my CB450 put K&N pods with built in velocity stacks on it and they seem to work ok. I will post a photo when I get a chance, not sure if you can still get them or not.
 

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Discussion Starter · #8 ·
Moved to DOHC fuel section.

Your symptoms sound like an issue with the slow jets. You're not going to fix it by changing the main jets. Folks with more experience with the DOHC bikes will be along with more on that. In case you haven't already seen this, even though it refers to a different bike the fundamentals still apply:

https://www.hondatwins.net/forums/6...4-cb400-cv-carbs-pods-how-make-them-work.html

And, as long as you're here:

https://www.hondatwins.net/forums/23-member-introductions/121120-critical-read-before-posting.html

Welcome to the group.

Nice bike.


Appreciate the link to the velocity stack idea. I have plenty of room to try this... and Ill hunt around for some slow jets to experiment with those! Thanks!
 
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