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Message: [QUOTE="arnego2, post: 1279748, member: 86293"] [b]Rpm[/b] That could be, but the pre owner of my bike a RM125 year of 1995 did have to change the plugs once per ride. He did run it if 30:1 to 32:1, while I run it with 45 to 50:1. He had the problem that the oil left over the pipe. I did clean the pipe up and ride it in hills, but with around 5000 RPM or even more as with less I couldn't get up there. :yikes: Now, I never had to change the plug and the oil which leave the pipe is down to 2 drops per 4 hours how riding. I think that 2 strokes, like the RM125 or all others, like the higher RPM when riding, around 5000 to 8000 and in the MX even higher I guess. :nod: just my 2 cents Arnego2 [/QUOTE]