80cc Chappy/Champ Yamaha Bore

Kevin Z /
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I have a 77' Yamaha Champ lb 80 (same as chappy 80). Took the cylinder out today and the piston is toast. I believe its a 47mm. There is some wear on the cylinder too as well so i am thinking i should bore it larger and get a bigger piston. I'm a little lost on what I should ask the machine shop and what pistons i could use. I will be upgrading the carb/intake but do i need to change the exhaust as well. Any input/guidance would be appreciated

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