I’ve been working on getting the “ratty” JEMCO engine cleaned and running. So far it’s not as bad as it first appeared. The displacer piston was easily cleaned off, as was the graphite power piston , but the inside of the heat cap was filled with old red rust dust and a little burnt oil deposit. The little rubber “o” rings on the power piston pin were deteriorated. Not a big deal, and probably normal for a 25+ year old engine. Easy fix.
[new heat cap parts still available at PM Research
https://www.pmmodelengines.com/shop/solar/solar-accessories/replacement-heat-cap/ ]
Pic from early 1978 Owners Manual Model 1
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