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MX, SX & Off-Road Discussions
General Moto | Off-Topic Posts
CRF vs. YZF vs. KXF - my 250F shootout/ride reports
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[QUOTE="nephron, post: 690456, member: 23759"] Would be interesting to see side by side camshaft specs. "Where" the power is on a 4 stroke is [I]almost[/I] exclusively dependent upon camshaft timing. Hotcams, eg, shows a stage 1 and 2 cam for the CRF450. Why they start with so much exhaust timing is a mystery to me, but they obviously don't feel the need to increase it as they go up to the stage 2 cam, where they're just bumping Intake lift a mm or so and adding 6 or so degrees of gross duration. Lobe separation angle is not listed, but is obviously very important. The reason I'm saying this, is that in a few years, they'll have as many camshaft options for these bikes, as say Engle has for a BBC. You'll be able to pick your power curve for each track, let alone SX vs. MX....and just like jetting, we'll be fiddling with camshaft, mounting advance, etc. changes before each race. This would be a good time to start an aftermarket dirtbike cam company. If Rich sees this: Why the [B]huge[/B] discrepancy b/t Intake and Exhaust timing? Couldn't be exhaust beyond the head, right? Are we talking valves, exhaust port? What? Nikki--that's the kind of review we need in the mags. Good job. [/QUOTE]
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MX, SX & Off-Road Discussions
General Moto | Off-Topic Posts
CRF vs. YZF vs. KXF - my 250F shootout/ride reports
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