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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
03 cr250 head mod
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[QUOTE="CR69r, post: 664846, member: 42827"] after exhausting enough bolt on mods, i've decided i want to go the motor mod route. everybody always complains about hondas having lousy bottom end on the 250's. i've noticed they also have the lowest compression ratio at 8.5:1. my idea is to simply have the head turned down to raise the compression similar to a yamaha's at 9.5 to 1, and have the ports polished but not altered. will i see a substantial difference in the bottom end power, or will it be miniscule? the tuners i've spoken to are all pushing for a port job as well. i understand they can get bigger gains with additional porting, but i'd sooner take it one step at a time, and so would my wallet. this bike runs fine on pump gas, which i also like. theoretically, raising compression requires higher octane levels, so i'm logically thinking i MAY need race gas now. but but but- i have many friends running the higher compression yz250's on pump gas without incident, so how is that? is the octane requirement also dependent on the characteristics of the porting? [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
03 cr250 head mod
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