K & N Air Filter

deerman2701 · Sep 21, 2010

I have been running my quad with stock jets, the only mod i have is the motor is bored out a little bit, and i have a K & N Air Filter. Should I go up one jet size or should i be good at 145.

I still run closed air box with NO holes and stock exhaust WITHOUT baffle.

DeadLastRacing · Sep 21, 2010

I take it that the K&N is a stock replacement drop in type filter? Jetting is mainly for how the carb is breathing. Your Jetting should be fine. Unless you notice it acting weird. Do you?

deerman2701 · Sep 21, 2010

it was fine until i started getting all these problems with the engine stalling and backfiring, i was just wondering if it would contribute.

DeadLastRacing · Sep 22, 2010

How long were you riding with the filter and bore before it started all that? Did it happen right after those mods were done or just randomly?

Have you by chance checked you carb boot for cracks?

juggaloclownz187 · Sep 22, 2010

Good call deadlast.... Also look into your accel pump, make sure its not sticking.... Also do a plug chop, it will tell you were your at, what part of the throttle is it backfiring/dieing at?

deerman2701 · Sep 22, 2010

it started randomly just like 2 weeks ago, i torn the carb apart and found the accel pump plunger frozen down, i dunno if it was frozen while it was still on or after i reassembled it but it is unfrozen now, and also there was a crack in the boot but i might have done that, so i ordered a new one. We will see i just didnt know if a wrong jet over time would cause issues.

deerman2701 · Sep 22, 2010

and it was at HIGH RPM when i goose it, but it was only sometimes

DeadLastRacing · Sep 22, 2010

the carb boot crack was your problem. Or do you still have issues with the new boot?

deerman2701 · Sep 22, 2010

will find out soon, its the last thing to come in the mail... figures haha. i bought a new shifter for direct shift because i was in the woods and it broke off, a carb rebuild kit for the carb gaskets, and some various brake parts. i will let u know