Great answers, everyone! Of course, just like Dick says, it's great fun when
you're not staring at the broken toy.
Sorry, Dick! Jim wins the prize this time. #5 push rod sheared at mid point.
(4 others showed signs of contact with cylinder head, also at mid point.) So,
#3 cylinder exhaust valve failed shut.
Suck; squeeze; bang; whoops! Nowhere for exhaust gas to go until adjacent
intake valve starts to open, just before TDC. Out goes the exhaust product,
right through the front carb.
Possible reasons for bent push rods:
1. Tappits hanging up in up position
2. Rocker hanging up in closed position. (Not likely.)
3. Friday 13 again!
4. Your best diagnostic hypotheses gratefully accepted.
Thanks again, team. You are the best.
Mike N.
CC75088L MoneypiTR
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