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Dirt Bike Brands - Other
xr 250 big bore
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[QUOTE="dirt bike dave, post: 1147356, member: 18302"] XR 250 has a 73 mm bore and 59.5 mm stroke. It is a 6 speed. A common big bore kit is 77 mm. XR400 has a 85 mm bore and 70 mm stroke. It is a 5 speed. The engines share a strong family resemblance, but the 400 is not a bored out 250. FWIW, I had a big bore piston put into my '90 XR250. It added nicely to power, including to low end. However, the bike still liked to rev, and it was not exactly a powerhouse even with the big bore. IMO, a stock XR400 has much more low end power than a big bore XR250. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
xr 250 big bore
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