07-31-2024, 11:27 PM | #1 |
Join Date: Jul 2024
Posts: 3
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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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07-31-2024, 11:55 PM | #2 |
Join Date: Feb 2009
Location: Michigan
Posts: 1,039
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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/
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2012 Kawasaki Versys 1984 Honda Magna V65 2016 Rhino 250 2016 Tao Tao 125D |
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Yesterday, 08:34 AM | #3 |
Join Date: Aug 2009
Posts: 539
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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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Today, 04:05 PM | #4 |
Join Date: Jul 2024
Posts: 3
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Are you saying that the wrist pin is an indicator to piston size?
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Today, 04:16 PM | #5 |
Join Date: Jul 2024
Posts: 3
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The coolster website was my first stop. Primarily for the part number, which then led me down this rabbit hole of figuring out if I got a 110cc or 120cc. Coolster website only shows skirt length and wrist pin center to top of piston and no further info is found in the description. I don't know if the engines where switched during a specific year or series or something!? I understand chinesium quad curators are hard to cone by but, maybe somebody knows something?
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Today, 07:05 PM | #6 | |
Join Date: Aug 2009
Posts: 539
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Quote:
The Chinese engines are very unreliable when it comes to the information in the engine VIN and the displacement on the cylinder wall. You cannot assume that you have a 52 or 52.4mm bore going by the numbers, the engine has to be taken apart and certain parts measured for accuracy. |
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