afew400ex
12-19-2011, 08:50 PM
Ok, here's the issuse....
I'll try to give as much details as possible to try and speed up the help from you guys.
I bought a 2000 400ex that is stock, except for aftermarket k&n knock off air filter, he had it for a few years with no problems until carb started dumping fuel during wheelies. so he parked it (outside, bad move). that was 2 years ago.
I brought it home and started messing with it.
Cleaned the carb, complete tear down, pulled needles, bowl, air/fuel ratio screw, main jet & slow jet.
All looks good, no debris or bent parts.
clean air filter, new gas, cleaned plug.
now heres where it sits:
Will not hold idle, backfires real bad under 1/2 or full open chock, & won't run unless I rev it up at least 1/2 throttle.
the idle srew is maxed out, the pilot screw is 2 1/2 turns out & slow jet is 1 1/2 turns out. I also tried to run it with slow jet bottom out(no turns out) Plug is blackish, little wet. But it will fire up under full chock with a little gas(1/8 throttle)
ANY IDEAS ????
I'll try to give as much details as possible to try and speed up the help from you guys.
I bought a 2000 400ex that is stock, except for aftermarket k&n knock off air filter, he had it for a few years with no problems until carb started dumping fuel during wheelies. so he parked it (outside, bad move). that was 2 years ago.
I brought it home and started messing with it.
Cleaned the carb, complete tear down, pulled needles, bowl, air/fuel ratio screw, main jet & slow jet.
All looks good, no debris or bent parts.
clean air filter, new gas, cleaned plug.
now heres where it sits:
Will not hold idle, backfires real bad under 1/2 or full open chock, & won't run unless I rev it up at least 1/2 throttle.
the idle srew is maxed out, the pilot screw is 2 1/2 turns out & slow jet is 1 1/2 turns out. I also tried to run it with slow jet bottom out(no turns out) Plug is blackish, little wet. But it will fire up under full chock with a little gas(1/8 throttle)
ANY IDEAS ????