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'04 450 EXC idle

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Hi Guys,

Rode the 450 ('04 EXC) around for a bit yesterday and noticed the idle was going up and down on it. It would surge up for about 3-4 seconds then come down and go back up again, never really held steady. Am I correct in assuming this is usually a lean condition on the pilot or a possible air leak on the intake somewhere? The temp hasn't really stabalized here in Michigan yet (40 deg. 1 day, 80 the next) and I havn't been riding it so I've done nothing with the jetting. It does have a JD kit on it from the P.O. though. Other than this, it starts up really easy and pulls like a freight train with good throttle response so I dont think my pilot is clogged. Anything else I should check out besides what I mentioned? I got it all cleaned up now and I'm ready to strip it down and check the valve adjustment anyway. Thanks in advance for any input. :smirk:

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Lean or clogged pilot jet. a JD kit will make that bike rip. If it has stock jetting it's lean.

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JD kit is in from PO, can't recall what pilot was missing from the pack (at work now,shhhh :smirk:). Thanks, just wanted to make sure I wasnt overlooking some common issue with them I havn't heard about yet.

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Sometimes JD uses the stock size pilot but that is a starting point only. Sometimes I would bump the pilot one size. When I had my KTM dealership every bike left my shop with a JD Jet Kit.

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