100 motor in 80?

alright i know what your going to say why do it when i can buy a 100. well i can get the motor for under 200 bucks (less than a big bore kit for the 80) plus i could later bore it to a 120 then. most of the pit bike races are 98cc 80's so i could be closer to competeing. finally all it is a motor. will everything electronics and all work on it. i know a carb will be a must but anything else. motors a 2004 bikes a 2003 xr 80. thanks

It will be fine.

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