revzalot

iTrader: (4)

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.

EdwardN

iTrader: (1)

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

revzalot

iTrader: (4)

Thanks for the suggestion. Would you know of any cool site on how to port and polish the ports. Just want to improve flow on the engine. I know grinding the crank will help too but that's for advanced grinders.

EdwardN

iTrader: (1)

I don't personaly believe in ports grinding or polishing and it was proven that it is not changing a thing, but if you look for JP's or other manufacturers web sites you will find there how the modding looks like and can copy it ( any way most of modders do it )
I will sugest you to spend more time on cranck and there is realy power hidden.
Edward

revzalot

iTrader: (4)

Sweet. Thanks good buddy.