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Check the crankcase vent, it is the tube from the left rear of the engine going to the air cleaner. It may be clogged causing excess crankcase pressure. Other than that Pour a bottle of Marvel Mystery oil or about 1/2 can of seafoam in the oil and take it for a 100 to 200 mile ride and change the oil when you get back. The engine may just need a good cleaning out.
Check the crankcase vent, it is the tube from the left rear of the engine going to the air cleaner. It may be clogged causing excess crankcase pressure. Other than that Pour a bottle of Marvel Mystery oil or about 1/2 can of seafoam in the oil and take it for a 100 to 200 mile ride and change the oil when you get back. The engine may just need a good cleaning out.