What pistons are you guys running in your RM250’s?

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1/13/2019 11:53 AM

When I purchased my 06, it had fresh Wiseco single ring race piston in it. The part number on that piston shows it is a Yamaha YZ 250 piston. I heard that people run the yami piston in it - some more intel on that would be appreciated. The guy gave me a brand new Vertex piston with it also, which is a double ring, and is the RM 250 piston. I am kind of sketched out to run it with a yami piston in it. I am thinking to replace it with the Vertex piston. What do you guys think?

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Born in Prague,living in LA,so if you don't like my spelling,blow me!

18 YZ450F
16 Yamaha YXZ 1000R
17 Yamaha MT-10 FZ-10 165 Hp RWP
06 CRF450X street legal supermoto
06 RM250 smoker
1992 CR250R basket case
2006 CRF50








1/13/2019 12:01 PM

Yup that's what is mine. One of Digger29 old bikes built by Ron Bushy. John Dowds old factory mechanic. Thing rips!!! Major engine work done to it though.

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1/13/2019 12:19 PM

Pretty much indentical engines, based off the YZ. Run the YZ pistons, I have in all of my RM’s, most everyone i know run YZ pistons, better overall performance vs. the RM piston.

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1/13/2019 12:38 PM

Pro-x.

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1/13/2019 1:48 PM

I run Wossner single ring in mine, works awesome.

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1/13/2019 2:21 PM

Wiseco racer elite here. It's also a single ring. About 20hrs on it no issues, runs great.

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1/13/2019 2:31 PM

Run the Wiesco Racers Choice 808 YZ250 piston in the RM250. The bike won't even sound the same with it. You'll thank me later :-)

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1/13/2019 4:11 PM

Digger29 wrote:

Run the Wiesco Racers Choice 808 YZ250 piston in the RM250. The bike won't even sound the same with it. You'll thank me later :-)

Wiseco is still making the racers choice piston however no more TiNi rings for it. Still a good piston and yes, run the YZ piston in the RM as noted.

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1/13/2019 5:42 PM

? , thanks guys.

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Born in Prague,living in LA,so if you don't like my spelling,blow me!

18 YZ450F
16 Yamaha YXZ 1000R
17 Yamaha MT-10 FZ-10 165 Hp RWP
06 CRF450X street legal supermoto
06 RM250 smoker
1992 CR250R basket case
2006 CRF50