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Message: [QUOTE="mtngoat, post: 143167, member: 18818"] Spoke with Steve at XRsOnly today. He said the 430 kit leaves the cylinder wall very thin. I didn't press him for a numerical value. But, he also said they've done a lot of them and no problems have been reported. They have done sleeves on a 430 kits too. The cost difference for a sleeve is ~$200. Considering all this, I think I'd opt for the sleeve or a smaller bore. Here's a funny development. I asked them about valve seals. They confirm avoiding the black ones, but recommend red neoprene replacements. Red, brown or green; anything but black, I guess. I figure substance is more important than color. One other area of interest is cams. Seems there are hard-welds (stock cores re-welded/ground), HRC/stock and a weird XRsOnly variant they claim is not hard-welded. Hard-welds require aftermarket "hard" rockers, HRC/stock and the XRsOnly variant do not. I have no clue how XRsOnly produces a re-ground cam with more lift/duration without welding material onto a core :think Maybe something's getting inflated. Anyway, longevity seems questionable with the hard-welds. There's conflicting opinions on this, but my dealer has built and re-built many 400 motors with hard-weld cams and claims they wear significantly faster than stock (which doesn't seem to wear much at all; ever heard of a cam failure on an XR?) The HRC cam at ~$390 is twice the cost of aftermarket hard-welds. My buddy runs one and compared to my 440, it really runs strong top end, where my 440 excels on the low side. I'm wondering whether a pumper carb and cam might be a more effective cost/benefit combo for your track application. BTW, I checked out the Powroll site and really liked it. I appreciate sites that educate in addition to profiling product. [/QUOTE]

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