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Yz125 ticking after rebuild

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Hi guys, Having a little drama with a 2002 Yz125 after rebuilding it,

 

what is happening is a ticking noise that seems to come from the top end, In my Opinion it sounds like the piston is just touching something on every revolution. It has been pulled down a few times now and according to the manual everything seems to be correct,

 

The bike seems to make full power and starts very easy, I havent done a compression test but im guessing it will be fine due to the easy of starting

 

 

any help would be greatly appreciated

 

Cheers

 

Craig

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Will you post a video? How are your tolerances between cylinder and piston? Did you check for play in the rod and wrist pin? Any marks on the piston?

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put the original piston back in and the noise went, so must of been the wrong size piston

 

thanks for all your help

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