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Hi Guys. I found one of those little black miniature pucks on my garage floor with a dollop of oil on it. I discovered then that the "puck" is supposed to reside between the fins on the cylinder heads- presumably to stop them from vibrating. On close examination, I found oil on several of the fins, notably close to the spark plug location. But I have not been able to locate a source of the oil. Any ideas?

Thanks in advance. Perhaps copy replies to smseigel@shaw.ca

If we are talking about the rear cylinder, on 900 heads there is a small blindplug just behind the spark plug hole. This blind plug often is a small cause of oil leakage.

perhaps this plug is also on 750 heads?

Michiel

Thanks Michiel. There is a small screw on the aft cylinder near the spark plug. That could be the cause of the leak. Is that what you are calling a "blindplug" What is it for?

Sms

If it's what I'm thinking of, it blanks off an oil passageway that is machined in after the head is cast. As in they drill a hole to allow oil to flow in the head, and then cap the end so it doesn't leak.. which it ends up doing anyway...

That would be it. Thanks