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CB350 Mikuni Jetting

1296 Views 5 Replies 4 Participants Last post by  ROSKO
Well I have been struggling to get my bike tuned right over the past few weeks. I used the Ohio site to get a general idea on what kind of jets my bike would need, but after switching and swapping I'm always running lean or rich depending on needle or main jets, when I hit about 6k on the rpms.

Here's my list of mods. Todds pistons, New Cam chain with slipper tensioner, Megacycle 123-20 cam, and Mikuni VM32 Carbs with velocity stacks.

If anybody has a similar setup and could throw me a bone on where to find a better start, or if you have any better ideas.
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A lot of the 350's raced by people here are run in a 'formula' class, so we have to run the stock carbs...

SUDCO makes a great carb tuning manual, you may want to check that out.

The thing to do is start with a huge jet and work your way down till it gets lean. Start with a 120 main and do some plug chops under load (any gear) at REDLINE (9500-10000rpm) move down from there, 6000rpm is right around the point where the fuel control is being shifted from the needle to the main jet.

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