cylinder questions

i replaced the cylinder, piston and rings on my motor.
the new cylinder i got had wayyy smaller ports
the old cylinder has a dent where a piece of the carb got wedged in,
(the reason that i replaced them)
the dent is below the intake port,
almost as wide and about 1/2 inch down

with the smaller ports, i can feel the engine has more to go, but isn't giving it


if i put the old cylinder back on, what could happen?
where could i get this new one ported?

p.s. thw motor ran amazing for the few seconds when:
- i had a flat rear tire
- i had inadvertently shut the gas off,
right before it bogged out, it was running better that ever
why is that?^^ .



any and all help is appreciated

also, what sprocket is best for speed.
i got plnty of bottom end torque, but not a very high speed
it seems rpms arent getting as high as they could

were would i get a smaller jet?
and also, i modified the pipe for my stingray, and the length before the bottle, which i guess is the muffler and expansion chamber, is alot longer than the regular
because of that, im assuming, im not getting as much power