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Author Topic: lt250 misfire  (Read 509 times)

Offline Zilla273

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lt250 misfire
« on: July 02, 2013, 02:40:05 pm »
ive been noticing my 250 will misfire when revving, weird thing is it seems to pull through all the gears good, when I rev it with the clutch in it sounds like its got a limiter like a 4stroke 450. my jetting is 42 pilot,180 main with a pwk38.. shearer pipe, carls porting.. ive replaced the stator assembly and coil, this problem is hit or miss, sometimes it runs great does this sound like a cdi problem??
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Offline Zilla273

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Re: lt250 misfire
« Reply #1 on: July 02, 2013, 02:51:21 pm »
biggest thing is when its doing it I cant launch, not even in 1rst gear in sand with 13 42gears :P
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Offline LT250RWV

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Re: lt250 misfire
« Reply #2 on: July 02, 2013, 03:18:21 pm »
What needle are you running in your 38pwk
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Offline Zilla273

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Re: lt250 misfire
« Reply #3 on: July 02, 2013, 03:37:36 pm »
I believe its the dgh needle, il have to double check
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Offline Zilla273

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Re: lt250 misfire
« Reply #4 on: July 02, 2013, 06:24:14 pm »
yes it is a dgh needle
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Offline Chuckie25

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Re: lt250 misfire
« Reply #5 on: July 02, 2013, 07:37:50 pm »
Our CR80 with a kart cylinder will do the same thing. Acts just like its on a rev limiter (sounds pretty badass lol)

Not the same thing I mean lol it doesn't misfire. Just acts like its on the limiter. I believe it's cause it's running out of fuel/air flow. Our 85 is RETARDEDLY ported though.

This may seem odd but have you tried replacing your plug?
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Offline Zilla273

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Re: lt250 misfire
« Reply #6 on: July 02, 2013, 08:07:09 pm »
yeah I've tryed changing plug acpl times, it seems really flat up top too  when its acting up
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Offline GrkGuy

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Re: lt250 misfire
« Reply #7 on: July 03, 2013, 06:14:57 am »
check marks on stator to make sure they are lined up, or sounds like your jetting may be of
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Offline MotorGeek - Jerry Hall

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Re: lt250 misfire
« Reply #8 on: July 03, 2013, 06:58:19 am »
Quote from: Zilla273 on July 02, 2013, 02:40:05 pm
ive been noticing my 250 will misfire when revving, weird thing is it seems to pull through all the gears good, when I rev it with the clutch in it sounds like its got a limiter like a 4stroke 450. my jetting is 42 pilot,180 main with a pwk38.. shearer pipe, carls porting.. ive replaced the stator assembly and coil, this problem is hit or miss, sometimes it runs great does this sound like a cdi problem??

Most two strokes act rich at high RPM without a load on the engine.  It might be a little rich but you are close to having the correct main jet if it pulls through the lower gears without a high RPM miss-fire. 

If you install a main jet that runs clean at high RPM in neutral it will be too lean under a load.
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