YZ125 problem

i got an 03 yz125 earlier this year and ive put a lot of hours on it and now its bogging really bad. ive cleaned the carb, the air filter, and switched spark plugs, and when i did that, it bogged a little less but there is now a noticable knocking sound inside the engine. top end rebuild im thinking? thank you

Yep,definately time to pull the ole jugaroo,better now than later financially.Let us know what you find.Good luck.

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