Suzuki GS1100L

I met Steve Moran on a plane (Account Executive for Canadian Scooter Corp) and he suggested that TK4 might be able to help me with my 1980 Suzuki GS 1100L problem. 

I've had the bike for about 3 years and have fixed it up to work well except for one problem. When I drive the bike for a prolonged period at the higher RPM's it seems to build up pressure in the crankcase. After use like this – and you stop the bike – it spews up oil. Can you help?

Thanks, David Jones

Hmmm, where to begin ?

Given the fact that it's 28 years old and of unknown (by me) mileage, it could simply be worn out. A compression test would verify that.

OR...
If it still has the stock airbox, could the crankcase breather hose be kinked or plugged ?
If it doesn't have an airbox (i.e. K&N pod air filters), where does the breather hose vent to ?
Is the crankcase overfilled ?
If oil changes are infrequent, what you're seeing may be a combination of water vapour (normal condensation) and motor oil.

I know, so many questions...

TK4 

Yes, barring other simple, external causes like blocked crankcase ventilation, worn/cracked rings allowing the compression gases to slip by them is the only explanation.

A common cause on even low mileage older motors that they can stick a ring, even if the bore is good. Older engines need very careful storage because they are more prone to this.

The problem is, even if it's a simple stuck ring, you have to tear down the motor to fix it anyway. A big bore kit would be neat at that point ....

KC

Steve Moran works for CSC? That guy does get around ....

Editor 'arris

P.S. I'm betting on worn rings with the GS1100. 

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