hi everyone, its been a while since i was on this forum but i have a new bike! this time a yamaha and im pretty happy with it, now the bike was in pretty good condition so i saw a potential to build it into a supermotard. the engine is in the shop for a revision, and i mean everything is being replaced EVERYTHING! now the bikes frame looks new, i even polished the aluminium parts and i have some sm wheels standing ready to be mounted ;) an oversized braking kit and everything it needs to be a worthy sm... now my question is that the engine block is pretty filthy, and i dont mean sand and dirt but its filthy with oil stains no rust or corrosion only grease and oil, i have tried everything to clean those out but the black and gray stains wont go away... is there a way to get those out of the way? the tricky part is that its cast aluminium so its pretty hard to get out, so guys maybe you have some trics to get those out. tahnks in advance
and yet again sorry for my bad english since i'm from belgium
and yet again sorry for my bad english since i'm from belgium