I didn't mention the ignition thing in an effort to less-confuse things.
Call it bad timing or call it co-incidence. I changed my breaker-point ignition just before I started the pond project. It ran and started well before the change-over to Pertonix. After it still started and ran fine for a few days - and then started getting worse and worse. I had assumed the problem had something to do with the ignition work. That's when I posted my low 8 volt reading for cranking-voltage. It still cranks at 8 volts and I'm sure the starter is drawing excessive current. But it is NOT a problem with the ignition. Pertronix claims their breakerless module runs with 8 to 16 volts. I tested mine down to 6 volts and it still worked fine.
Seems as I ran this crawler hard, all day, almost every day for a few weeks the valves got deeper and deeper. Probably didn't matter much until it got to zero clearance.
When I put the engine together 10 years ago, the exhaust valves were set at .018". So now if less then 0 clearance - I assume I've got at least .020" wear. But it IS possible that two gaskets settling a bit caused some of the problem. Keep in mind that unlike other engines - the 1010 has two gaskets under the head - not just one. A deck gasket and a head gasket. If, in 10 years with bolts torqued 150 lbs. - those gaskets even got .005" thinner from compression - that would take .005" away from the valve clearance (assume a 1 to 1 rocker-arm ratio. I don't know what the ratio actually is.
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