I had an issue a few weeks ago where when I got to 3/4 throttle -
about 4000 rpm's - My oil alarm would go off (a beep every couple of
seconds) and my engine would throttle down to about 500 rpm's. I had
this guy fix the spark advancer and that seemed to take care of the
problem. I could go full bore no problem. I have run it several
times since with no re-occurrance.

Sunday I was out with my family and running at half throttle, it came
up again.

Any thoughts of what might be causing this?

Thanks in advance,

Dave.