ive got after market carb and that dumb exhaust, getting ready to gasket delete i just need yamabond, is this not the aluminum air filter
If you want more power youre gonna have to do more than do the gasket delete.....
You must widen the exhaust port 1/8" on each side plus raise the exhaust port atleast 1/16"
For the intake side you want to widen the sides 1/8" each side and lower it 1/8"
For the transfer ports you want to open them up a lil so the flowmore fuel then also polish them ...
You want to reshape the skirt on the flow side of the cylinder so the cylinder skirt doesnt cause turbulence...
Turbulence is a power robber,,,,Velocity is what you need to make power.....
Seems to me this thing has been ridden hard with that exhaust leak hole and put away wet without very much love.....
What you really need to do is start off with a brand new fresh cylinder with brand new piston...……….
Good Luck