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VERY VERY noticeable ticking on motor start up please help

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I just started my dads '02 WR250F and I immediately noticed a VERY loud ticking noise coming from the motor. We have had this bike since feb '05 and it has never made a ticking this loud. Does anybody know what it could be?

Oh yeah, we just had the valves adjusted and it hasnt been ridden since. Right after we got it back we did ride it for a little bit and it wasnt making this ticking noise. It has sat for about 3 weeks since it was last ridden.

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Is the noise coming from the top or bottom end? Could be the decomp mechanism sticking or not having enough freeplay thus having the exhaust valve slam in to it if it is coming from the top end.

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its possible that the gas in it has gone bad and it is making the motor "ping" is that what you hear? i heard that when you let gas go bad the octain evaperates which makes the gas have a super low octain level.

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