The carbs may look the same, but they are different. The MR uses a smaller main jet, bolsterd by a third "power jet." The front wheels are different, as the MR has narrower, offset hub for speedometer hookup. Pipes, look the same, but are slightly different--although they are interchangeble in a pinch. Muffler is more restrictive on MR, but will bolt on. Seat is longer on MR, with metal base. Obvious differences are transmission gearing, flywheel/stator, points. The top of the airbox is different on a CR. Frame is carbon steel on MR and chromoly on CR. Fenders are same mold, but white on MR and red on CR. Footpegs are higher on MR and I prefer them for trail riding. Rear brake pedal is different. The only difference on the engine case is one is stamped MR and the other CR (unless they're replacement cases and I don't believe they are stamped). About the only parts that are really exactly the same are: forks, crankshaft, rod, piston, clutch parts, side covers, cylinder head, shocks, shifter, kickstarter, kickstart internal parts, air intake boot and carburetor insulator mount, air cleaner cage, grips, brake and clutch handles, clutch and throttle cable, clutch actuator, brakes, and rear wheel. Just list the stuff from the MR as from an MR. I'd like to think most buyers know what they are looking for and what is interchangable, but judging from the number of people I've heard from that purchased MT parts thinking they would bolt onto a CR or MR, I guess that's not really the case.
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