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Dirt Bike Brands - Other
2003/2005 kx154 questions(144 kit + 58mm stroke)
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[QUOTE="ignition retard, post: 1249156, member: 82557"] I'd say the bore stroke ratio is actually altered BACK closer to what it was as a 125. I think rod ratio is the rod length/stroke ratio. The effect of a decrease in rod ratio is to increase the pistons velocity when close to TDC and decrease its velocity closer to BDC than if you had a larger rod ratio. This is because the crank motion perpendicular to the axis of piston motion is amplified by a shorter rod relative to crank throw. Think of it in terms of angles, with a short rod the piston is close to the crank so from 90°(rotational) BTDC to 90°(rotational) ATDC the angular separation from the crank journal to the wrist pin axis is larger than if the rod were longer (think of the triangle those two crank positions with the wrist pin makes). I hope that didn't make it more confusing. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
2003/2005 kx154 questions(144 kit + 58mm stroke)
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