DorkingBonny, two things to remember here. Firstly and MOST important, it is better to have LESS oil than too much in the primary case. Secondly, it is better to put straight grade SAE20 oil in the primary and NOT 20/50. The straight 20 WILL NOT CONTAMINATE the engine oil.
However, BOTH of these will benefit the the barely capable standard clutch.
I would drain the oil, remove the cover clean it all out and check the clutch, chain & adjuster and the alternator ready for the start of the season. New gasket and fill to the CORRECT level and ENJOY
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See you and your bike at the Bexley Legend rally in July????
Roy.
