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Larry

Molesworth wrote in news:ukmole-
:

The motor is 2003. Doesn't use any oil normally, but I noticed the level
had got higher when I checked.

PS Found the buzzer circuit!

Not good. The other posts were spot on as to possible answers. Don't run
it this way just to ruin it. Could also have a cracked ring, or cracked
head letting the pressure (and fuel spray) inside the cylinder blow into
the head past a leaky valve seat, etc. It needs to be torn down by
competent mechanic and repaired.

B..ring
O..ut
A..nother
T..housand

Very unusual for a Yanmar to break....great little engines.