Could anybody tell me how much the ports on a untouched malossi 172 barrel need to be raised by in order to benefit from a 55mm stroke crank? My boss has done port and flow work before, and said he will do my barrel for me. Any help will be much appreciated, as I don't really want to shell out £150+ for JB Tuning to do it :banghead: Thanks, Conor.
It's 10 years later now. I have the same issue, + I have no one to do it in close countries.. Any portsmaps for 55mm Stroke?
