Author Topic: RM250A oversize Pistons ?  (Read 1509 times)

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Offline micko

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RM250A oversize Pistons ?
« on: February 28, 2015, 05:01:05 pm »
Seems to be a bit of a rare thing being different size to B and C RM's. whats around these days ?
RM370A RM250A RM125A RM125S YZ250A YZ125C XR75K4

Offline LWC82PE

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Re: RM250A oversize Pistons ?
« Reply #1 on: February 28, 2015, 05:15:51 pm »
Might be able to make TS250 work as they are 70-72mm.
Wanted - 1978 TS185 frame or frame&motor. Frame # TS1852-24007 up to TS1852-39022

Offline pmc57

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Re: RM250A oversize Pistons ?
« Reply #2 on: February 28, 2015, 05:17:32 pm »
TS250 pistons do the trick. They just need some of the skirt removed to clear the crank webs and drill the two holes at the exhaust bridge. I've built two RM250A motors with TS250 in each, performance is great.

Pretty sure Wiseco do them in 0.5mm increments up to 72mm.

Offline micko

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Re: RM250A oversize Pistons ?
« Reply #3 on: February 28, 2015, 05:35:32 pm »
Thanks, just read it in an older thread. Wealth of information you guys ????
RM370A RM250A RM125A RM125S YZ250A YZ125C XR75K4

Offline LWC82PE

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Re: RM250A oversize Pistons ?
« Reply #4 on: February 28, 2015, 05:36:57 pm »
Thats what i thought. Yes up to 72mm.
Wanted - 1978 TS185 frame or frame&motor. Frame # TS1852-24007 up to TS1852-39022