i spoke quite extensively with the rep at wiseco, (who could have increased his sale by selling me the additional parts) and he assures me that although that would be optimal it is not necessary. he also said this kit is considered a "drop-in" kit and it would run on pump gas. only requires power commander and dyno. also spoke with my machinist/drag racing friend who has done more extreme work on bikes and he seems to agree. all depends on what rpms and gas mileage i want to run.i did however, replace all bearings and slightly larger oil jets.So are you going to strengthen the bottom end too?
My motor was already built and in the bike when I bought it, so I don't have too much info, only the receipt which doesn't list the specs.Sime, what are you're engine specs? Cam Specs too? Looking at the 900rr head from Erion someone took the time to have that head lapped/milled on the main sealing surface. That seems like a good idea for a used head.. making sure it's 110% flat.