Oil leak

lewisjohn · May 22, 2019

A mates bike R100/7 has developed an oil leak, it seems to be coming from the area that houses the starter motor, there’s oil showing in the air filter to carb pipes, leaking from the little drain hole above the dipstick, and between the crankcase and the timing chain case.
I’m thinking it could be a problem with the crankcase breather.
Any suggestions?

solidstate100 · May 22, 2019

Firstly, the basics. Is it overfilled with oil?

It could be a breather issue, but it could possibly be compression blow by/crankcase compression (I note also the barrel base gasket is leaking quite nicely) - is it a smoker?

lewisjohn · May 22, 2019

solidstate100 said:
Firstly, the basics. Is it overfilled with oil?

It could be a breather issue, but it could possibly be compression blow by/crankcase compression (I note also the barrel base gasket is leaking quite nicely) - is it a smoker?

It is an occasional smoker, mainly on overrun , compression on both cylinders is 145 psi.Im going to take out the filter and remove the starter cover tomorrow, then go from there.

lewisjohn · May 23, 2019

Found the problem,split rubber pipe on the breather .

Oil leak

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