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Message: [QUOTE="EricGorr, post: 147490, member: 19611"] Although FMF makes a valiant effort to post baseline jetting specs on their web site, they don't post other important data like; 1) Fuel brand and specific gravity 2) Oil brand and pre-mix ratio 3) Air temperature or density altitude 4) Spark plug heat range They also don't have any disclaimers like your riding ability, terrain where you ride, and bike condition have a bit more to do with jetting than your choice of exhaust system. Boyesen does the same thing, instructing people to drop their jets by 3-4 sizes. I can't tell you how many people seize their bikes from well meaning instructions then call me up asking what went wrong. Don't blame your dealer for your bike seizure, most mechanics try their best and assume that if a big company makes a particular suggestion that its good as gold. Your bike seized because the piston expanded at a faster rate than the cylinder. So it either has too lean of a main jet, you loaded too hard just after start-up before the coolant temperature stabilized, or perhaps the left crank seal is leaking (very common problem on CR125s) and the extra air seeping by the seal leaned the mixture like too small of a main jet and caused the seizure. Good luck, Eric [/QUOTE]