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Old 07-04-2007
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Default rm250 stroke

Hey guys im currently looking for someone who knows a hella lot about rm250's. I need someone who can tell me the stroke of the rm250 from the years of 1986 to 1989. Thanks guys. Reason i need to know this is because iam going to be a building a stroker crank for my lt250r and already have a 1986 rm250 top end.
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1992 lt250r
.030 over
Wiseco 86 rm250 piston
Kinney racing ported rm250 cylinder
Hot Rods crank [lt250r bottom end]
LRD Pipe and Silencer
Lonestar +2 +1 arms
Lonestar +4 Axle
Lonestar Sway Bar
Works dual rate front shocks
stock reed cage....soon for aftermarket
39mm Keihin Carburetor
UNI filter
Rear Duro flattrack tires
Front Duro flattrack tires
Ice racing is just around the corner
By the way if you want to know more about this motor just ask.
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Old 07-04-2007
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all i know is the 87 rm top end is different...i saw somewhere on the net were someone started to build a lt250r engine with a 87 topend but they machined the cases to make the top end fit...but
i think the stroke are the same
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89 QUADRACER W/
86 RM250 cylinder
Using a 86 Rm piston..with cut skirt to match bottom of the sleeve on intake side.
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Old 07-04-2007
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I am no expert but if the 87 LT was based off the 86 RM then wouldn't the stroke be the same since the cylinders swap?

RM250G is 246cc.
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Old 07-04-2007
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indeed it is 70mm
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