Hi On My Yz 125 engine the gear that is attatched to the crankshaft behind the clutch basket area the nut that only the gear on won't come off. iv tried impact driver socket and rench, spanner and a hammer. but still nothing its not welded on as can't see anything apart from the nut which is pretty clean. any ideas iv got a air tool thats my last shot but if that doesn't work i don't know what will.
