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07-31-2024, 11:27 PM | #1 |
Join Date: Jul 2024
Posts: 4
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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: 1,043
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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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08-02-2024, 04:05 PM | #4 |
Join Date: Jul 2024
Posts: 4
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Are you saying that the wrist pin is an indicator to piston size?
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08-02-2024, 07:05 PM | #5 | |
Join Date: Aug 2009
Posts: 572
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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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08-02-2024, 04:16 PM | #6 |
Join Date: Jul 2024
Posts: 4
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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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08-02-2024, 10:54 PM | #7 | |
Join Date: Feb 2009
Location: Michigan
Posts: 1,043
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Quote:
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2012 Kawasaki Versys 1984 Honda Magna V65 2016 Rhino 250 2016 Tao Tao 125D |
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08-03-2024, 02:52 PM | #8 |
Join Date: Aug 2009
Posts: 572
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+1 on what david says above, join the website and you will be able to access a lot of specific information for the quad you have.
I nosed around on there for a while, I found out the bore is 52.4mm and the stroke is 55.5mm.Using the formula to calculate the total displacement, I came up with this: 5.24 x 5.24 x 5.55 x .7854 = 119.68 cc Not only is the piston listed, but there is also a gasket set with all of the top end gaskets you'll need. |
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08-03-2024, 10:34 PM | #9 |
Join Date: Jul 2024
Posts: 4
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Dude! Thanks for taking the time to do that digging. I guess I need to register with the site. I've ordered parts from coolster before but, it was parts that were more easily discernable. My other concern was that the website didn't specify that it came with rings and pin I'm cautions with Chinese sites as they show ya 1 thing and...!
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