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91' CR 125 engine swap into a 99' frame

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Hello, I have a 91' CR 125 engine that I am wanting to put into my 99' CR 125. In other words, I have 2 complete bikes with electronics and carbs on both, but only the 91' has a good engine(recently rebuilt) and I want the good engine in the newer frame. I know the mounting holes are different sizes, no problem we have a machine shop. But I have some questions, should I use the 91' or 99' pipe? Will the 99' stator bolt into the 91' engine? Which electronics (stator, flywheel, CDI box, and coil) do I run for this setup? Are the carburetors interchangeable? What parts are interchangeable? Thank you

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