2001 Yamaha 660 Raptor - HELP PLEASE!!

[raptor1660]

Hello there i have an 01 raptor 660 and have had a lot of problems..Right now i have replaced my stator, my cdi box, my kill switch and so on.... I am trying to figure out when i try to start it, it will backfire loud as hell like a gun shot, it is pissing my neighbors off lol... I choke it it will pop (not loud though) turn the choke off and start to crank and some of the times it will just blast out the pipe it is a pain and sometimes it will start up great end of story... I have no problems when riding with it back firing or anything...just when i first start it if i ride more than a block or two its good to sit and wont backfire when starting if i go into the store or something....It has a jet kit that the previous owner put on it could that be it..Im debating on rebuilding and cleaning the carbs...Just someone get back to me need this fixed thank you for taking your time to reade!!!

[oxidized_black]

try spraying carb clean in the carb while it's running good and dump the gas if old and replace with some gas/carb cleaner additive. a new plug would be good too ...

[raptor1660]

i have put a new plug in it and the gas is only a few days old i fill it up quite often and never let it sit..The backfiring is not a problem when riding just when cracnking over it is loud!!

[Mudflap64]

Sounds like it's been jetted too rich.

[raptor1660]

ok thank you i am wondering now should i buy stock jets and put back in it...i plan to get a pipe before the ice comes...when i put a pipe on it should i put this jet kit back in it?? Or should i just put stock in it with an aftermarket pipe..do i need a aftermarket jet kit with a aftermarket pipe

[rappy97]

No... Don't run aftermarket jetting with stock parts unless it's lean. Jet accordingly and also get a good FULL exhaust system, such a Sparks, Monster, or Barker. Makes sense to me- stock pipe = stock jetting... Aftermarket exhaust = aftermarket jetting...