Originally posted by Gemballa750
The rust marks are from obvious lack or improper user maintenance, this has nothing to do with quality control from mugen or novarossi. I can believe that there were metal shavings in your engine from the time you purchased it, but like others have said, if your running a 180 dollar engine and you supposedly modify engine like you're a hot shot, you should have the commen sense to open the engine up and inspect before using it. Live and learn.
that crank shaft is what Mugen USA sent him claimed that it's a "brand new" shaft.........so there should not be any "lack or improper user maintenance" damage on it coz it is not suppose to be used !!