86 300 gs burning g/box oil

[gra1961]

have an 86 300gs had been sitting for bout 5 yrs due to corroded out water pump housing,replaced and run the bike but was burning g/ox oil,replaced crank seal with gen seal but still smokes badly.drained g/box oil and started and run it for about 30 seconds,no smoke.would be unusual to be sucking it in thru crankcase gasket I would think.anyone think of where else it may be getting thru ?cheers gregg

[evo550]

Through your case halves between crank area and gearbox. Maybe a faulty gasket.

[supermotomc]

Have you burnt out the chamber and silencer yet?

[gra1961]

no smoke when run without g/box oil cancels out oily pipe .guess i was trying to talk myself out of spliting the cases.motor out she comes.

[g465b]

can offer the same advice you offered me-only have two spares and use paper mache,that 300 was mint when u got it
what have u done. cheers

[Canam370]

If you aren't sure whether the bikes burning gearbox oil (or if the pipe is full of old oil smoking) put a little Castrol R into the gearbox (with the existing lubricant, not instead of ) - you'll smell it in the exhaust. 

[gra1961]

thanks grant.where's my compliance plate?

[80-85 husky]

go the crank gasket for sure. try the Castrol r trick, will defiantly confirm or deny the need for a costly time consuming rebuild when all you want to do is ride it.....