No run, no happy :(

[desertgasser300]

I would do a compression check and pull the cylinder. And measure the ring gap.

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[farmerj]

So a day or two ago the bike started, ran for a few minutes and then died (as it has done several times) But while it was running I was able to ride it, and remember that it had acted this way when the problem started...it ran fine at low throttle openings, but over half-throttle, it sputters and bogs.

Does this give us any clues?

FWIW, it seems like an electrical problem, to me. But I could be wrong. It also seems like when the thing heats up a bit, then whatever the problem is gets worse and kills the engine.

[wa_ndro]

Originally Posted by farmerj

So a day or two ago the bike started, ran for a few minutes and then died (as it has done several times) But while it was running I was able to ride it, and remember that it had acted this way when the problem started...it ran fine at low throttle openings, but over half-throttle, it sputters and bogs.

Does this give us any clues?

FWIW, it seems like an electrical problem, to me. But I could be wrong. It also seems like when the thing heats up a bit, then whatever the problem is gets worse and kills the engine.

so ur definitely getting fuel if its running then...
I was going to suggest you had adjusted the float too far and weren't getting enough fuel. I have done this before.
Easy to check - just drop the bowl and turn the fuel on and play with the float.

[Neil E.]

The float would have to be adjusted very low to have an effect at half throttle. Lack of flow is usually more noticeable above 3/4 throttle.

I would tend to think this is electrical which could be any of the following: connections / stator exciter coil / ignition coil / CDI.

[iamovru]

Originally Posted by farmerj

Thanks guys, I appreciate it! I had pulled the pilot & main jets and they looked fine, no gunk in the carb, but I'm thinking you're right about the need for a good cleaning and can do a pilot jet replacement. Will check some of the other items mentioned and keep on the path!

Jeff

You really cant tell with jets by a visual inspection. I had the same issue with my KTM 450EXC and I replaced the pilot and it started right up. If gas has been sitting in there for a year, I would bet that is one of your problems.