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Hate knowing the answer on this one....

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I started my bike the other day (2003 XR50 w/82cc BBR kit) and it started making a tack, tack, tack, tack sound from the engine casing. It doesn't sound like valves and the sound is coming from in the casing, NOT the head. When the engine rev's up, the sound increases then at some point in acceleration the sound goes away, until...the engine is around idle again.

I am not sure how many hours I have on this engine but it can't be too many. It was running strong the last time out but when I decided to start it a day later, it started making this noise....

I hope it is nothing expensive :thumbsup:

Anyone experience this before???

Thanks! :devil:

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