No there was not build up. rings and piston were fine but I installed a new cylinder and head new piston and rings and new exhaust
I have not checked compression
I have not re jetted what do you recommend and top speed prior was 28 now 35 so top speed is faster.
seems about the same except for the late power band it now has.
I have a 1978 NC 50 and put the big bore kit on essentially making it a 60cc. I added an m/m pipe and mini K&H carburetor. seems small I even added Boysen Power reeds.Here's the problem it starts and idles just fine, its just slow to get to speed. once it gains momentum the power band kicks in. How do I get quicker response?