when is it time for a top end

have an 06 yz450, when do you know you need a top end, as far as compression and all??i checked the valves last week,they were in spec. not knowing the history of the bike,ive only owned it about 6 months. seems it soesnt top out like t used to,riding down the road,but i can tell the clutches slipping a bit now too

Take it to a dealer for a leak down test. All of your questions will be answered.

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