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Top end tapping

Hi,my name is ed.from cape breton n.s.bought my son a 250cc 4 stroke dirt bike from giovanni.it was brand new when i got it and i was wondering if the valves have to be adjusted after so many hours of using it.there is a tapping noise coming out of it and it sounds like valves to me but i am no mechanic.sounds like it's in the top end.power and reliability seem to still be there though.any help would be great thankyou.

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This might be obvious but I would change the oil and replace it with a high quality fully synthetic oil. If the bike was run low on oil or if the engine became super heated the viscosity of the existing oil is shot. I would also make sure the cooling fins on the head is clear of any mud or crud.Check the cooling fins that are under any type of cover, I have had mice pack these areas full of stuff that has caused overheating. Generally I would be sure that the bike is runnng at the correct temperature before taking anything apart such as setting the valves. When an engine gets hotter than it should be, the oil thins and this can cause knocking. Good Luck:)

Posted on Feb 18, 2010

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Hello adj your valves to spec

Posted on Nov 25, 2008


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