Yd100 needle bearing slop

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6:17 PM
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Jan 18, 2017
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68
Hi everybody, I took apart my yd100 today to give it a windowed piston and noticed that the there is a lot of space between the piston and the needle bearing sitting on the wrist pin. So much that with the needle bearing slid up against the piston the crank arm loop has only ½-⅔ of needle bearing under it. I'm sure even if I center that bearing under the crank arm it is going to decide it wants to live up against one side of the piston. Does anyone else experience that. To me that doesn't seem like that bearing would last very long. Anyone else see this on theirs and what are your thoughts??
 

cdeuce1988

New Member
Local time
8:17 PM
Joined
Oct 6, 2022
Messages
4
What kind of connecting rod does your motor have. Mine was a zmn100 rod which only takes a 12mm wrist pin and needle bearing so you might have to send back that window piston and the order a new one that comes with a 12mm wrist pin and needle bearing the yd100 connecting Rod is made for a 10 mm m wrist pin and needle bearing.idk if that's helps or not but hopefully it should.
 
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