RM125 piston question

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9/16/2016 5:35 AM

Recently scored a brand new cylinder/head combo for an 04 RM125 I am rebuilding for my youngest one to ride. My question is which piston to use? Aren't most aftermarket pistons slightly oversized? Should I go OEM? Thanks for your input.

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9/16/2016 10:47 PM

I have been running ProX piston in my RM125 with no issues. That is likely because they are from the same manufacturer as the OEM.

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9/18/2016 4:26 AM

Measure the bore of the cylinder and get the proper sizes piston, its used so no telling what you have.

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9/18/2016 10:13 AM

xnationalwrench wrote:

Measure the bore of the cylinder and get the proper sizes piston, its used so no telling what you have.

As mentioned, both pieces are brand new OEM in the wrapper. I do believe Pro-X parts are manufactured to OEM specs. Thanks for the input.

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9/18/2016 1:30 PM

xnationalwrench wrote:

Measure the bore of the cylinder and get the proper sizes piston, its used so no telling what you have.

1stSSPZ wrote:

As mentioned, both pieces are brand new OEM in the wrapper. I do believe Pro-X parts are manufactured to OEM specs. Thanks for the input.

He is referring to the fact that they offer A, B, C, and D size pistons. They are each .01mm larger than the previous, strting at A. Usually a B piston is fine. You can measure the bore but you will need a bore gage to do it correctly.

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9/18/2016 3:32 PM

Thanks!

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9/18/2016 8:07 PM
Edited Date/Time: 9/18/2016 8:08 PM

ProX pistons are OEM pistons in a ProX box. With ProX, their A size is OEM standard bore. That being said, you can pick up a piston kit for $64 shipped. I recommend OEM gaskets and seals.

http://www.ebay.com/itm/Pro-X-Racing-Parts-01-3224-A-Piston-Kit-for-2004-11-Suzuki-RM125-53-95mm-/162181735171?_trksid=p2141725.m3641.l6368

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9/19/2016 3:53 PM

No doubt! Thanks!

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