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Everything Dirt Bike
Make / Model Specific
Honda
ball park HP numbers and top end rebuild
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<blockquote data-quote="cleonard" data-source="post: 100076" data-attributes="member: 21"><p>I have no experience on particular setup, so what follows is based on general experience. Could be totally off base, but I doubt it.</p><p> </p><p>Why is everyone so hung up on hp? It really doesn't matter. What matters is torque. I imagine that the 490 kit is simply a larger diameter piston running the same crank. Larger piston means more area for the combustion gases to push against which makes more torque. This is more torque starting down at they bottom and staying until the high revs. Now between the heavier piston and heavier stainless valves you will lose a bit on the very top end. If you live on the rev limiter I wouldn't even install the kit as it will not be good for engine longevity. Then again living on the rev limiter on a 450 would be totally insane so I really doubt that is an issue.</p><p> </p><p>The hp gains are modest, but the torque gains at the low to mid end are very real. Expect to notice the difference everywhere.</p><p> </p><p>One question. Did you not have enough juice with the stock engine?</p><p> </p><p>Come to think about it, that is a stupid question as I just purchased the beta 520(498cc) instead of the because I wanted more low end torque,</p></blockquote><p></p>
[QUOTE="cleonard, post: 100076, member: 21"] I have no experience on particular setup, so what follows is based on general experience. Could be totally off base, but I doubt it. Why is everyone so hung up on hp? It really doesn't matter. What matters is torque. I imagine that the 490 kit is simply a larger diameter piston running the same crank. Larger piston means more area for the combustion gases to push against which makes more torque. This is more torque starting down at they bottom and staying until the high revs. Now between the heavier piston and heavier stainless valves you will lose a bit on the very top end. If you live on the rev limiter I wouldn't even install the kit as it will not be good for engine longevity. Then again living on the rev limiter on a 450 would be totally insane so I really doubt that is an issue. The hp gains are modest, but the torque gains at the low to mid end are very real. Expect to notice the difference everywhere. One question. Did you not have enough juice with the stock engine? Come to think about it, that is a stupid question as I just purchased the beta 520(498cc) instead of the because I wanted more low end torque, [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Honda
ball park HP numbers and top end rebuild
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