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Message: [QUOTE="DualSportr, post: 143910, member: 19592"] Not much - valve to valve and valve to piston clearance are tight on all the XR's. I'm not saying cam timing can't be changed, it's just not something that should be tackled by the average joe in his garage - unless you're willing to clay the top of the piston to check tolerances. As far as cam chain wear goes, I assume you're talking about stretch - the change is negligible, so adjusting for stretch is typically not necissary - if the cam chain is stretched enough to change cam timing - it's time for a new chain. Excellent kit! really makes a difference in torque especially. 10.3:1 is still higher comp than stock, but not so high as to cause any detonation problems for most. I assume you mean JE piston - I'm not aware of the JB brand. No chamfer on a four stroke - hope you didn't pay for it :) The reason it seems to work so well is that it utilizes the stock porting and camshaft so much better than the stock displacement - the stock head/cam configuration actually flows better than the 400cc requires. The 415cc just kinda optimizes everything. Admittedly, the 440cc will add more, but is more expensive and for lighter riders doesn't gain much over the 415cc kit - I was just offering a cheaper option which many people aren't aware of. For the same reasons you chose the 250 over your WR400. Bullet proof, long-proven technology. Smooth trail-friendly power. No hi-tech radiators to deal with. Why do modifications? For the same reason you did the 277cc kit. You weren't looking for a different bike, just more of what the XR already has to offer! [/QUOTE]

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