750 Oil Leak

S

Simon Yates

Senior member
My '69 750 has a small pool of oil under the starter.  Enough so that it is travelling along the ignition cable and dripping out of the ignition cover (which has a tiny vee ground in the underside).  Any suggestions before I start removing parts?
 
Primary cover gasket... where the ignition cables pass through.    Have chased this numerous times, now start off by looking there first.

Pauls options are all very obvious, this is a bastard, difficult to trace. :D

piet
 
poorly welded crank case repair under starter motor, near cylinder  base, left rear, and leaking through the chicken shit, this area was later stiffened with a web, and even later with two webs.
CLEM



ok then maybe not, kept you reading though didn't it
 
I will start looking at the primary drive area as all was well before I fitted a new gasket last time.
At the same time keeping an open mind as to what it could be.
Thanks Clem :o :o :o
 
Should there be an o-ring between the front face of the starter and the casing?
There is a shallow groove in the casing but no seal on my bike.
 
If it is a single lug crankcase (one stiffening rib in front of the oil filler/dipstick) they have a tendency to crack the crankcase at the left rear stud.
 
Simon Yates said:
I will start looking at the primary drive area as all was well before I fitted a new gasket last time.
At the same time keeping an open mind as to what it could be.
Thanks Clem :o :o :o
Click to expand...

Says it all... :D

The lug through which the cable passes is sometimes a bit irregular, with the gasket sometimes a bit iffy.  Use a little gasket-goo around this lug, and only this lug, otherwise you will have extreme difficulty removing the cover in future.

piet
 
Cleaned the bike and ran it for a while before giving it a close visual inspection ::)
The only leak is the original one from the primary chaincase (with the new gasket).
I can tolerate this until I change the oil and fit another new one (with some goo).
Must have been a leakage as I filled the bike.
 
No sign of any possible route for the oil leak on my 750.  Am reassembling with a new gasket and a little sealant along the lower edge.
The dipstick is 202 mm exposed rod length, could someone please check the length of theirs?
I want to fill with correct quantity of oil as I drained 2.25 litres and it was to the lower dipstick mark.  The green book says 3 litres capacity.
 
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