Oil leaking onto rear mudguard then tyre

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Thanks everyone for your valued suggestions. Pretty sure the oil has been leaking from the tank cap even screwed down hard. When I took the battery out, I could see the oil was misted all over the back of the tank and around the neck of the filler cap. There was no branch off the return pipe for a feed to the chain oiler. I am going to do the kitchen towel test to prove/ disprove this theory. Will renew the cork seal but see that US owners can get a synthetic one which has a larger diameter and would be a better fit in the filler cap. WHen you press the dipstick holder part back against the spring, you can see that the cork floats around a lot. This is no good as the flange to the neck against which the cork sits os compromised by the two 'nicks' taken out to allow the cap catches to pass below the flange. At these 'nicks' there is next to nothing for the cork to compress against. Given that the tank is almost pressurised, it is a rubbish bit of design. Something along the lines of a radiator cap would have worked. I am not sure that fitting a pressure valve on the crankcase breather pipe will do much. Thanks again. Richard
 
Something along the lines of a radiator cap would have worked. I am not sure that fitting a pressure valve on the crankcase breather pipe will do much. Thanks again. Richard

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RICHARD MOLYNEUX said:
Given that the tank is almost pressurised, it is a rubbish bit of design.... I am not sure that fitting a pressure valve on the crankcase breather pipe will do much. Thanks again. Richard
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Just to refer back to these comments for a moment...

The tank is not ‘almost pressurised’ as it’s open to atmosphere, so tank ‘pressure’ isn’t an issue per se.

A reed valve in the engine breather stops the continual sucking and blowing of (in your case) 920cc of oil and gasses. This helps reduce frothing etc in the tank. But the main benefit is reduced internal crank case pressure when running. This generally helps reduce / prevent a myriad of potential oil leaks.
 
Glad to hear it was an easy fix, something they taught us in auto shop, start with the easy stuff first. Nothing worse than pulling everything apart to find something easy.
 
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