Still blows smoke!

[jimg1au]

the best way to see if its sucking gearbox oil is to drain out oil fill with Castrol R start up bike and use your nose the smell of burning Castrol R is unmistakeable as long as you are not using it in you petrol that is
jim

[OverTheHill]

in the "70's i used to use diff oil in my air filter because it was thicker--certainly had a distinctive smell if it sucked a bit through or maybe i was thinking of my stuffed PB Vauxhall come to think as ran it in that till it drank the lot lol. Anyway, put a litre in your gearbox & you'll soon know!! & so will the neighbours. Be very unlikely for the center gasket to leak though unless misplaced on assembly or had case damage etc but gotta be an answer there somewhere.

[Curtis]

I recon there could be case damage, filling the gearbox results in filling the crancase.

[Momus]

I fixed a similar issue on my RM370 for one ride by replacing the phillips head screws in the cases with shcs's and tightening them carefully and well.

I subsequently replaced the center gasket and both seals to be sure.

[Tomas]

Since you have already run the gearbox with no oil in it, I would just split the motor check everything and replace all bearings, seals and gaskets. Good luck

[MaxPower]

It probably is the crank oil. But those bikes are really restricted with the stock exhaust. If you have the money get a RM exhaust and give it a try. The worst that can happen is your bike will run better and be lighter after you have it together again if the issue didnt turn out to be a oil filled twin wall exhaust

[Curtis]

Its got a FMF on it, and I really dont think running it for a short period of time in neutral will damage any bearings.

[Curtis]

Ends up after splitting the engine and finding the centre gasket OK and cases OK that the new Genuine crank seal that I fitted has the wrong ID  :'(
Incorrectly supplied from my Suzi dealer....BUGGER!
At least I found the problem

[TT5 Matt]

thats alot of effort and cost to find out the dealer forked up on 1 seal but at least you know where your bottom end is at and no need to go in there for awhile