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honda tb 88cc w/race head kit, what main jet?

4593 Views 9 Replies 5 Participants Last post by  dirtbkr188
Hi, I'm new to this forum and pit bikes. This site is awesome and what i've been looking for to get advice. I just installed a Honda TB 88cc big bire kit with cam, race head, 20mm carb, air filter and a fmf power core 4 exhaust. What size main jet should I run? I haven't even broke in the bike yet because I didn't know what size to use. also any break-in tips? Thanks guys! -Evan
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I have that exact same setup. I run a 38 pilot, needle clip one down from the middle and I was 1 size up on the main though I don't remember what number that is. I think I might need to go one size richer again on the main since it got cold since last time I rode it had a tiny sputter at WOT. I usually have the air screw somewhere between 1 to 1 and a 1/2 out but I pretty much have to adjust that all of time. I live in phoenix so all of this is for about 1700 ft elevation. If you don't have the pilot jet kit the stock 35 pilot worked ok for me but I had to run the air screw all of the way in pretty much in order for it to have any kind of throttle response.
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