Piston wrist pin too small???

James2132 · 07-02-2014, 10:51 AM

I just install a 61mm bbk and I think I install my 150cc wrist pin instead of the pin that came with the kit by accident. After I test drove it oil started leaking everywhere and engine cut off. Scooter would not crank up. Do you think a too small of a wrist pin could cause any problems??

Madathlon · 07-03-2014, 07:44 PM

If you put the wrong wrist pin it, a few things can go wrong.

1: The pin can shift to one side and break out of the piston
2: If it louse it can beat up the inside of the piston and then break loose from the rod.
3: It can cause the piston to tilt and seize up in the cylinder

James2132 · 07-05-2014, 09:56 AM

Thanks. You were rightt. I took the engine apart and the piston had bad scuff marks on it and the rings were smashed! Now in see why i wasn't getting compression. Loos like I can just order a new piston and I'll b good. I saw one on ebay for $ only $14 61mm

07-03-2014, 07:44 PM	#2
Madathlon Join Date: May 2014 Location: Redding, Ca Posts: 70	If you put the wrong wrist pin it, a few things can go wrong. 1: The pin can shift to one side and break out of the piston 2: If it louse it can beat up the inside of the piston and then break loose from the rod. 3: It can cause the piston to tilt and seize up in the cylinder
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