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Old February 17th 2005, 03:59
4agedub's Avatar
4agedub 4agedub is offline
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2008cc type 1... carb jetting? where to start

Hi all
I'm currently finishing off my 2008cc type 1 engine. The carbs that I want to use is twin 44idf webers. Where is a good place to start off with the jetting?
choke tubes?
Thanks guys
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Old February 17th 2005, 09:06
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vujade vujade is offline
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Im no carb expert by any means... this is just info that I am passing
on that Ive learned from others on the forums...

first off from what I understand, you start by taking the size of your intake
valve (say you have 40 x 37 valves).

so yo take the 40mm valve and subtract 3mm to come to your venturi
size of 37. then you take 37 and multiply by 4.2 to get your main jet size
(37 x 4.2 = 155)

so you would start with a 155 main jet and go from there.
how you get your air jet & idle jet sizing Im not sure...
I do know that the air jet will usually be larger then the main jet
as in (180, 190, 200, etc)
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