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220 Died. Help.

Perk

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#1
2002 KDX 220, FMF Rev, Q Silencer, Frisbee removed, RB carb mod running jetting that was installed in carb from RB.

Today while riding tight off road terrain the bike started to bog badly in the upper end of RPM range, 3/4 throttle and above. No problem anywhere else in power range until a little bit later in the ride. Bog got worse later on in ride and started to appear in lower throttle untill bike just stopped running. Tried new plug with no luck. Checked vent tube on top of tank and breathing fine. Still appear to have good compression but bike will not refire. When it cut out, it acted if out of gas, but there was plenty in tank. Yes, the petcock was on. Even tried reserve but nothing. I'm thinking trash in carb but I am not the best at diagnosing issues with the bike.

Fire away.

Thanks,

Perk
 

BSWIFT

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#2
Disconnect the fuel line from the carb and drain some into a container. If it flows good, remove your carb and clean thoroughly. It sounds like you have some blockage and your starved for fuel.
 

Perk

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#3
Thanks for the feedback BSWIFT. That's along the same lines as I was thinking, but I trust a lot of you long time DRN members more than myself when it comes to these issues. I'm pretty good with a wrench, but don't have a lot of confidence in my thoughts as to what's wrong. If anyone else has a different potential diagnosis, I'm all ears. This site and this forum in particular have never let me down. Thanks again.

Perk
 
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#4
Stator

Had a similar problem a while back. Turned out to be the stator failing. Shop Manual has to specs to test it if the fuel system checks out.
 

Perk

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#5
More good feedback. Preeschateya OldDirt.
 

Perk

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#7
No, not yet. I've never had to check before, so I'm not sure how to do it. Someone please refresh me. I've seen it done but it's been an eternity since. I pulled the carb today but did not have time to tear it down and clean everything out. I could definitely see a little bit of very fine funk and gunk in there. I guess it is just stuff that made it's way through the air filter over numerous rides. I keep the bike pretty clean, but do not keep up with routine maintenance like I should. I keep fresh tranny oil in it and clean the filter pretty regularly, but I get pretty lazy after that.
 
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#8
/\ Remove the plug from the head and put it back in the boot. Now lay it on a conductive metal part of the bike (frame, pipe, etc.). Kick it over with your hand a few times and you should see a spark. Don't hold the plug against the metal with your free hand or you'll get zapped, just let it lay against it.
 
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#10
check your airfilter also. dirty filter, or over oiling is a very common problem i see on dirtbikes when they come into the shop. if in doubt just clean and reoil it. it wouldnt hurt to do it anyways ;P happy riding
 

BSWIFT

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#12
I forgot to mention to check your float level. Too low and it will starve for fuel.
 

Perk

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#13
Would the float level be an issue over that short of a time span? The bike went from perfect to just having a lean bog near redline within about a minute. Everytime I would get the revs up, the bog would come down further and further in the RPM range, until it reached the midrange, then it just went kapoot. This all took place from start of problem to dead in about 20 minutes. Got into the carb today and main jet and pilot appeard to have some degree of blockage. Kind of hard to see in those tiny holes though. After some carb cleaner the jets looked perfect though.

I am a bit confused though about setting the float. Was looking at the float tip on the JUSTKDX site and can't figure out what they are referring to as the float bowl mating surface. I could not find what I would call a mating surface. I get everything else in the instructions but that. Is he referring to the surface where the float bowl and the upper half of the carb meet? That makes sense to me, that's probably it. Can anyone confirm that for me? If that is it then I'm going to definitely have to bend that tang on the bowl pivot thingy. Mine is not even close to level when it meets that little actuator pin thingy.
 

Perk

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#14
paab also mentioned above to check reeds. Forgot to mention that I have a V-Force II installed. Have not yet checked reeds. That would have been a nice post to have read before re-installing the carb today. :bang:
 
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#15
I would check the Top End. If the bike Quit after a lean condition, I would check to see if the piston is about to grenade or Major scoring of the cylinder