MOUNTOPZ 3125xr8-u piston size???

POPtimusPrime · Yesterday, 11:27 PM

We got blue smoke! How do I know if I need the 52.4mm or the 54mm piston. Plate does not seem to give any indicators either (152I, 154I, etc. that I read tells you what size it is). My bit of research says the 52.4mm but, I read that's for the 110cc and I'm pretty confident it's 120cc (despite labeled 125). Only other visible marking is the 124cm3 on side of jug/case. I had trouble uploading pics. I can do the work but, lack confidence in knowing the riggt part. I'd be interested in upgrades too!? Pls help before she blows!! (I'll keep trying for pics)

david3921 · Yesterday, 11:55 PM

If you need parts for your ATV, they are available from the Coolster website.

https://coolster.com

Piston and rings:

https://coolster.com/product/piston-...-120-lpj-c004/

dirtbkr188 · Today, 08:34 AM

The only sure way to get the correct parts is to take the head and cylinder off and measure the bore with a digital caliper. Then you can measure to see if you need a piston with a 13mm or 14mm wrist pin.

Yesterday, 11:27 PM	#1
POPtimusPrime Join Date: Jul 2024 Posts: 1	MOUNTOPZ 3125xr8-u piston size??? We got blue smoke! How do I know if I need the 52.4mm or the 54mm piston. Plate does not seem to give any indicators either (152I, 154I, etc. that I read tells you what size it is). My bit of research says the 52.4mm but, I read that's for the 110cc and I'm pretty confident it's 120cc (despite labeled 125). Only other visible marking is the 124cm3 on side of jug/case. I had trouble uploading pics. I can do the work but, lack confidence in knowing the riggt part. I'd be interested in upgrades too!? Pls help before she blows!! (I'll keep trying for pics)
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Yesterday, 11:55 PM	#2
david3921 Join Date: Feb 2009 Location: Michigan Posts: 1,038	If you need parts for your ATV, they are available from the Coolster website. https://coolster.com Piston and rings: https://coolster.com/product/piston-...-120-lpj-c004/ __________________ 2012 Kawasaki Versys 1984 Honda Magna V65 2016 Rhino 250 2016 Tao Tao 125D
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Today, 08:34 AM	#3
dirtbkr188 Join Date: Aug 2009 Posts: 536	The only sure way to get the correct parts is to take the head and cylinder off and measure the bore with a digital caliper. Then you can measure to see if you need a piston with a 13mm or 14mm wrist pin.
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