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big-bore
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[QUOTE="tentbound, post: 208841, member: 22562"] I don't know how the Honda big bore works, but the 265cc cylinder that Eric Gorr did for my Yamaha works great. The best 250 motor I have ever ridden. I little faster than before, but with a much smoother powerband. A 265cc is legal for the 250 class for AMA amateur competition (0.080 overbore rule) The only thing I did to the modified cylinder was to polish the exhaust port and PV after I got it back from Eric. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
big-bore
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