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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
99 KX 144 test (Eric Gorr vs. RPM)
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[QUOTE="EricGorr, post: 215079, member: 19611"] Just some observational notes. The KX cylinder must be turned down .050 inch at the cylinder base because RPM and I both use the same basic piston forging. I did cut the base of the cylinder but it may not of been apparent to the naked eye since I do all the machine work before plating. I use a single ring and RPM uses a 2 ring piston. I go for the lighter, low friction design. A 2 ring piston is better for longevity, in fact it will probably last 50-100hrs.A 2 ring piston also seals better when using extrememly high compression ratio head designs. The YZ requires crankcase mods because the 58mm piston would hit the front side of the cases. Yamaha and Suzukis are the only models that require case mods. In fact my web site provides that information up front, and my book has a picture for people who want to try and do it themselves. It's a bummer that RM and YZ owners must pay more but I didn't design those engines in the first place. Keep in mind that the $1600 RPM engine mods includes bottom end rebuilding and crankshaft stroking, so thats not a bad price. You guys can criticize me all you want, I don't care and I certainly won't try to censor any of this. With regards to turnaround time, that varies based on shipping time and backlog at US Chrome. Besides the 98YZ125 engine in question was in my shop in the middle of September and there were a lot of other things going on in the country at that time, and a lot of uncertainty whether air and truck traffic was even possible in those dark days. Yeah I pretty much just chilled out and waited until things settled down before I shipped packages. I learned a hard lesson from the previous years UPS strike, where dozens of my customers packages sat in empty wharehouses for 2 weeks and I was held captive on the phone to their screaming. Recently I lost several hundred dollars worth of books and videos sent through the post office because of security and scrutinization by customs officials in foriegn countries. And just in case some of you guys don't read the newspaper, theres a WAR going on. And nothings normal anymore. As far as being dishonest goes, thats bovine feices! I try to be as honest as I can but sometimes you just can't keep a schedule in a hectic business. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
99 KX 144 test (Eric Gorr vs. RPM)
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