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Part throttle problem

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I have a '03 YZ450. It is stock, the only thing I've done is take 4" off the stock muffler. It is running the 165 main, stock needle position, and I'm at 15' elevation.

It has always had a part throttle, mid rpm problem. If I hold steady throttle, say 30~50% it pops through the exhaust and feels like it is missing.

What do I do to fix this?

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this happens while your riding it?

Yes, while riding. If I hold it in second or third, any gear really, at part throttle it does it. Coasting too, it pops through the exhaust. I checked my plug but it's black except that the electrode tip is clean. I'll have to put a new plug in, this could be from someone idleing with the choke on or something.

Thanks for the interest.....

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ok,well you can try richening the nedle 1 clip.if that does not clear it up,un plug the tps and test.wr450 guys have found that to clear up the miss.

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