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I have a 2010 brute force 750. We went to an atv Park here in Missouri and I started having a tapping noise and blue smoke coming from the exhaust. It is lifted sitting on 30 inch in-laws has a programmer and hmf exhaust. Not sure of any other work done as I bought it used. It still has power but worried about the noise and smoke..... engine rebuild time or just valves?
 

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Pumping oil into the exhaust isn't a sign of a bad valve unless it has a bent stem...and that usually won't happen unless she gets hit by the piston from a chain jump. I suggest you stop running it while you still have something to rebuild.
 
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