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i shouldnt be asking this BUT.......

643 Views 7 Replies 8 Participants Last post by  trx310r
Im tired of playing a guessing game, my quad is poping and backfiring after i accelerate wide open and let off the throttle which area of the carb do i need to adjust mods are listed below and im running a 160 main, needle 3rd, air to fuel is unknown, 55 leak 42 pilot and a boysen quck shot thanks in advance!
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Im tired of playing a guessing game, my quad is poping and backfiring after i accelerate wide open and let off the throttle which area of the carb do i need to adjust mods are listed below and im running a 160 main, needle 3rd, air to fuel is unknown, 55 leak 42 pilot and a boysen quck shot thanks in advance![/b]


lean on top, fatten up the main try 170
back the fuel screw out a little too....should be about 2-2.5 turns
^^^Yup....turn your fuel screw out 1/2 turn at a time and test....until it goes away.If you have to adjust beyond 3 1/2 turns increase your pilot jet size.
Im tired of playing a guessing game, my quad is poping and backfiring after i accelerate wide open and let off the throttle which area of the carb do i need to adjust mods are listed below and im running a 160 main, needle 3rd, air to fuel is unknown, 55 leak 42 pilot and a boysen quck shot thanks in advance![/b]
I shouldn't be questioning this but did you make sure your exhaust bolts didn't come loose?
Although 160 on your main does sound awful lean.
make sure you check exhaust i chased bad jetting for a couple hours until i found header loose!!
I had to put in an hrc needle to cure mine all the way, but mine just popped some didn't backfire....And make sure your header is tight mine has came loose too.......
turn out the fuel screw.main jet is probably fine.
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