KTM jetting info

Aussie_power_sports
Edited Date/Time 1/23/2012 8:35pm
Hey guys
Just got a 2011 ktm 250-excf and have some jetting questions.
Where I am we are forced to run a lower octance fuel http://www.opalfuel.com.au/
So I took the bike for a spin and it backfires (pops) when the throttle is let off and won't idle for longer for a few seconds.
It also felt extremely snappy, not sure whether this is because I haven't ridden for so long or maybe the fact its got 13-51 gearing.
Also the bike hasn't been run in yet, if that helps

If somebody could give me some help it would be greatly appreciated cheers
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mxryder231
Profile picture for user mxryder231
Posts
70
Joined
6/24/2008
Location
San Marcos, CA US
mxryder231 9/7/2011 10:23am
9/7/2011 10:23am
when we would set up ktms at the shop they come a but lean so we had to adjust the fuel screw about half a turn out, it sounds like your running lean. but i would only adjust it 1 to 2 times before you get the bike broken in cause they will loosen up a bit if that makes sense. not sure how or what jetting or restrictions you guys have.
Aussie_power_sports 9/8/2011 2:54am
9/8/2011 2:54am
So today I fitted the akrapovic muffler that came with the bike and took out the spark arrestor.
Fiddled with the idle screw and it now idles normally. Played with the fuel/air mixture screw, it kind of lagged when opening the throttle up but stopped popping (backfiring) when deaccerlerating. Went for a ride and it ran great, no bog no crackle no delay.

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