Jim,
If you're using multi-viscosity oil (10W-30) I suggest switching to single viscosity 30 weight, and if you're already using single viscosity, you might try non-detergent oil. Non-detergent oil won't hurt your engine for a season or two and will allow you to put off any heavier maintenance until a more convenient time.
As an option, we have had reports of people using a motorcycle oil that was designed for engines with integrated clutches to cure slippage in forward. I can't recall hearing of any particular brands, but a call to your local cycle dealership should get a recommendation.
Don
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