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[Graham43]

Thanks Norm I will use your test. Getting oil from the chaincase breather too.
Alan R thanks for the advice re the Bullet 65 engine. May need to raid the kids inheritance. Is the starter OK on this ie no weak sprag?

[Norm]

Graham, Sprag the same. When you say the crank case breather, have you drilled the under barrel breather out?

[Graham43]

Norm: it has a pipe from the primary chaincase and one from the top of the oil tank/gearbox and breather from timing case.

[Norm]

Graham, primary case shouldn't put anything out, breather from the timing cover shouldn't either because it should have a duckbill on it inside the timing chest. That only leaves the oil tank breather for oil to be coming from, as I said run a clear plastic hose ditectly up from the breather and up under the seat and then you can see if and how much oil is being lifted up. At one stage I ran the tube out to the rear and fitted a small bottle on the end so I could monitor how much oil was being carried over