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Ok i have a 04 ltz400 with the stock carb., i have a White Brothers Aluminum Pro full exhaust with a uni air filter. I hve been runnin this thing for a lng time with stock jets until i finally got tired of hearin the back firing, i had a 155 main put n the carb with air box lid on it bogs dwn really bad witch i expected but no back firing when the lid off their is no bogging but my back firing comes back? Also had a 13T sprocket put on it. Do i need to change the pilot to? I ride from 410ft-550ft. Thanks for all and any help Matt
 

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search the stickied jetting thread
 

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i run a 155 main, 25 pilot, air screw 3.5 turns, needle 3rd clip. with full system you need to get jet kit that has new needle. your air screw might not be drilled out either.
 

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i run a 155 main, 25 pilot, air screw 3.5 turns, needle 3rd clip. with full system you need to get jet kit that has new needle. your air screw might not be drilled out either.
theres not an "air screw" on the stock bsr carb...there is however a fuel screw ;)
 

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Check the jetting database sticky.
 

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