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Message: [QUOTE="BigRedAF, post: 1259719, member: 58172"] Yamalube-R is good stuff. I used it from 1979- 1990 in Yamahas and Hondas at 32:1 in 125's, 250's and 500's. Never an oil related failure. I switched to Klotz R50 when I got back into racing in 1999 and had some unusual crank wear on my YZ250 at the six month mark. The pistons in that bike always looked great so the crank may have been marginal from the factory. YZ250 with Klotz [url]http://s258.photobucket.com/albums/hh263/bigredaf/?action=view&current=image0-1.jpg[/url] :cool: I started using Amsoil Dominator 40:1 in 2005 when I went to the CR500AF and have had zero problems, no smoke, no fouling. The piston was still at the high end of the manufacturer's specs at the end of my first full year as measured by a micrometer. The good thing about Yamalube-R is that you can find it anywhere... [/QUOTE]