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Message: [QUOTE="TexKDX, post: 143923, member: 16276"] Yea, JE piston not JB. JB was to fix that nasty hole left by the con rod ;). On the cam chain wear and adjustments, just relaying what someone with experience told me. Technically it is not stretch, it is wear, and the wear shows up as lengthening the chain. The metal does not stretch. XRsonly touts the merits of the adjustable gear on their web site. Must just be marketing BS then? Chamfering - yes the xr250 has a chamfer on the bottom of the barrel. Taking out the material from the bore job squares the taper on the base of the cylinder. The chamfer makes it easier to get the piston in upon reassembly. The work was done by the guy who did Colin Edwards' race bikes prior to him being picked up by Yoshimura, so I assume it was done right. If you still disagree maybe you can supply some type of write-up and I'll make sure he sees it. Compression ratio - per honda's web site: "SPECIFICATIONS Model: 2002 XR250R Suggested Retail Price: $4,699 Engine Type: 249cc air-cooled dry-sump single-cylinder four-stroke Bore and Stroke: 73.0mm x 59.5mm Compression Ratio: 10.2:1 " 10.2 vs. 10.3 - as far as I'm concerned they are the same. If you would not mind expounding a bit more on some of your statements dualsportr it might be of some interest here. Example: "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. " Any supporting info would be appreciated. Thump provided a nice head flow chart, stock vs. modified, on another Yamaha-related thread. [/QUOTE]

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