09 klx250s backfiring
Senior Member
Joined: Sep 2009
Posts: 5,050
From: Abilene, TX
1st Gear Member
You're running a 42 pilot, 2.5 turns out, with smog stuff still on? I think you're pouring lots of unburned fuel into the exhaust, and the smog gear is injecting air so the fuel is burning off resulting in backfires.
A 42 pilot jet is on the large side IMO.
If you use the high temp rtv type stuff on the exhaust, follow instructions. Seal it up, let it set for 24 hours before fully tightening the clamps.
A 42 pilot jet is on the large side IMO.
If you use the high temp rtv type stuff on the exhaust, follow instructions. Seal it up, let it set for 24 hours before fully tightening the clamps.
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Junior Member
1st Gear Member
Joined: Jan 2014
Posts: 18
ya i put the stock exhaust back on it today,rode almost 100 miles. It did alot better the pilot is def to big but that was the only one i had. Im going back to a 38 pilot and prob a 124 main with 2 turns out. What do think about that? im going to leave the stock exhaust on the other was just way to loud. It revs up alot better since i did the dynojet kit with the diff spring.
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