cmusselwhite
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- Joined
- Nov 27, 2012
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I bought an hmf slip on, k&n air filter and dyno jet kit. followed the instructions. running lean, road it for 7 mins tonight and header was red... put in 148 main and needle on 4th groove. wants to stumble and pop at 500-1500rpm, after that runs good at 1/4-full throttle, if i run it up hard to wot and chop the throttle it wants to pop and backfire, also having some plames out the tail pipe. i read the long "how to jet thread" and learned a few things i didnt know, so i ordered a 45 pilot jet, when it comes in a am going to install it and the 150 main jet. if no luck after that, should i move the needle to the 3rd groove?? also my airbox has the lid and no holes in it. no other engine mods done.. any help will be appreciated. going racing the 17th and 18 of dec.. so hope to hear something soon.
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