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Message: [QUOTE="kx125412, post: 1274770, member: 68341"] Well for starters you never ever use engine braking on a 2-stroke if you can help it. You're using high rpms when on the gas and getting proper lubrication to everything then you let go of the throttle getting enough lubrication for idle, not high rpms, from your pilor jet and nothing else. 20:1 is a little much, 32:1 is basically standard mix ratio and has worked for many, many people. The magnetic material sounds like the iron bore. Are you sure its not flaking, or coming apart anywhere? Possibly the piston snagging a port, although you should notice that damage. It could be your big end bearings came apart. It happened to me on my RM125, mind you it was a 1982. I don't even know if its worth to fix man, cut your losses and sell it blown up. I got $350 for mine with it totally messed up and beaten. Mind you this is Canada and we pay too much for stuff. [/QUOTE]