Polaris 400 on 250r??
#1
I was just browsing the classfieds a few minutes ago and saw an ad for a Polaris scrambler top end and the guy said it would bolt right onto a 250r? I somehow think this is bull, but I guess you never know. I know that you can put a honda pilot top end on the R but I was under the impression it took crank and case work to do it, plus its a honda.
Is there any truth to the polaris thing?
Is there any truth to the polaris thing?
#2
#4
It's not a direct bolt up. It does require some case machining to get the larger sleeve to fit within the cases. A YZ piston and a spacer will work to get your deck hgt somwhere near where you want them.
Dave Moore, of MP Racing in Salem Ore makes them, he calls them Polondas. They are pretty fast!!!
Dave Moore, of MP Racing in Salem Ore makes them, he calls them Polondas. They are pretty fast!!!
#7
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#9
#10
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The Pilot cylinder requires case welding and stroking. The bolt pattern is larger. The Pilot is a 79mm stroke vs 72mm for the 250R. The Polaris is 70mm so the conversion is actually a larger displacement.
I'm not sure if there is enough sleeve material there, but a YZ490 piston has the same diameter wrist pin with an 86mm bore vs. the 83mm bore of the Polaris.
The Pilot cylinder requires case welding and stroking. The bolt pattern is larger. The Pilot is a 79mm stroke vs 72mm for the 250R. The Polaris is 70mm so the conversion is actually a larger displacement.
I'm not sure if there is enough sleeve material there, but a YZ490 piston has the same diameter wrist pin with an 86mm bore vs. the 83mm bore of the Polaris.