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I'm relatively certain it's a clamshell motor, so I doubt there are better cylinders for it. Exhaust could be widened and a little timing advance probably wouldn't hurtI ordered a brand new OEM muffler for $13. The plan was to give it a little mod.
Any suggestions for a p/c swap? I was going to pull the cyl and see if there is any “porting” to be done to try to give it a little more grunt.