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So, I'm replacing the piston and rings in my sons scrambler 50. I don't have the year because it is rubbed off. It is blue and yellow if that helps, I'm assuming they are are all the same. I have found some pistons on ebay, but they look to be over bore. Any idea on stock piston size? Or should I buy the kit with the cylinder and all? Also, I didn't notice when I took it off, but I believe the arrow goes towards the exhaust?

By the way I was having trouble with it staying running after it warmed up and it was bogging down. I did a compression check and it was at 70 psi. I'm not sure how it cranked and ran as much as it did.

I will also block off the oil injection, but will start a new thread for that.

Thanks for any help!
 

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