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Canadian Daves JustKDX
any machinist types? sleeve question
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[QUOTE="reepicheep, post: 1366579, member: 104942"] I did the Eric Gorr big bore / port / plating kit and like it. That being said, I just helped a buddy buy a KDX-220 and am restoring it for him now. According to the previous owner, his stock piston grenade within the first three months of ownership (naturally), so he bored and plated it to repair it. Not long after, that plating then started to peel, and caught a piston, and grenaded it *again*. Or maybe he was dumb and reused stock pistons, who knows. My guess is that the 220 won't let you bore enough material out to get a clean bonding surface for the nickisil... thats consistent with what Eric told me... he said the 225 big bore for the 200 was the more reliable path, as boring it out removes more of the factory tungsten deposition coating that can interfere with the nickisil bonding. Makes sense, but I am no expert. Anyway, in disgust, that guy said he he bored and sleeved it in steel. It then proceeded to run like a clock for the next 7+ years, he would just re-hone and slap in a new piston once every season or two. I tore it down last weekend, and everything still looked fine, so I bolted it back together. Looking at his sleeve, I think it was already into the water jacket, but it's hard to tell. Not much material left for boring on the 220. So nikasil is the theoretically better coating... it transmits heat insanely well and should be very durable. That being said, especially if you start with a 220, I am now thinking going with a steel sleve isn't as dumb as I was originally thinking... especially if you can find somebody to do good work cheap. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
any machinist types? sleeve question
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