Originally posted by revzalot
Just purchased a ZX21 Race motor and want to grind the ports. I would like some advice. I already have a dremel with the grinding stones and polishing pads. I do have an old spare engine to do a test run on. Thanks in advance.
Get diamond bits 3/32 shank and 3/32 cutting end. You will need 2 types cylinder and bulet type. Diamond bits are the best for this kind of work, but pretty expencive, but last forever.
Edward