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Hi all,

Following the Clymer procedure for installing the cylinder and head in ch4 (pg60) on a 69 desmo 350. Step #5 says to "Make sure the small o-ring is fitted in place over the hollow oil lubricating stud". I do not see what they are referring to on the cylinder or crankcase, nor do I see this o-ring listed in the parts catalog. Can someone kindly point me towards the part they are describing? There's a small hole on the crankcase that I think is an oil passage and the base gasket has a hole for this -- is that what they are referring to?

Thanks,
Neal.

It’s the o-ring shown below which fits over the protruding piece (assuming you are not missing that part (also illustrated)

Ian

photo of one of mine being stripped, Shown at top right of barrel next to cylinder bolt hole with squashed O ring in place

The O-ring should be made of heat resistant material.
These days you can buy Viton or silicone O-rings.
Standard type is likely to go hard and leak as it loses its "springiness".
This size works:
Designation = BS 011
Inside diameter = 5/16"
Outside diameter = 7/16"

Ohhhh. This is on the top of the cylinder. From the steps in Clymer, it made it sound like it was on the bottom, where it fits to the crankcase. I got it now. Thanks all.

Neal.