Piston ring broken, can't find seller?

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Tekky

New Member
Apr 3, 2012
9
0
0
Maine
I've been looking for someone who sells piston rings for a 49cc HT engine, but all I'm finding is 48cc piston rings. Will those work for me since they're so close together?
 

Tekky

New Member
Apr 3, 2012
9
0
0
Maine
How should I measure? What's the procedure? Sorry, this is the first engine I've ever been able to dig into and actually work on, haha.
 

Al.Fisherman

New Member
Sep 9, 2009
1,966
5
0
Calera, Alabama
Seems to be 39mm. Trying to find a converter that only needs hole diameter in mm.
What do you mean..."Trying to find a converter"?
If you can't find the proper size, go up one size higher, and file the ends. Keep in mind the ring pin in the piston. Normal ring clearance is .004 X the bore, a 66cc has roughly a 2" bore, that will be .008 clearance. Place the ring into the cylinder to measure. Me (on a 66cc) I'd file/cut, so I'd have .008 clearance, then file for the pin. Use a file or a dremele type tool.
 
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motor_bike_fanatic

New Member
Jul 26, 2011
377
2
0
Pennsylvania
If your piston ring is broken, you better make sure it didnt scratch the cylinder when it broke. I had a piston ring burn up and it scratched all the way down the cylinder. if it did scratch it, you will need a new jug and piston. you will easily be able to see scratches by looking in the cylinder.
 

a_dam

New Member
Feb 21, 2009
351
0
0
Momence, IL
You can also try Frank Bowman. He makes rings. Not only does he have many common sizes in stock, but will provide custom-made rings if given the necessary dimensions/information.

If you google his email address, you should easily find prices, parts in stock, etc...

I got a couple rings from him and am very satisfied.


Frank Bowman

[email protected]