My xlr600 honda (1986) has had a slight oil leak on the transmisson/shifter side of the engine for a while but last time out more oil came out, onto the chain (maybe a cup of oil) and the motor seemed to be hot. Any ideas besides gaskets. The manual refers to an oil screen as well as an oil filter but I;ve never actually found the screen, could that be my problem?? Any and all comments/suggestions welcome, thanks