Ed [Anderson], as I recall this engine was overheated quite some time ago to the
point of your having to replace the warped rear rotor housings. As I also recall
this was caused by air being trapped in the water jacket due in part to inadequate
water jacket venting in the plugs up position. Also you had an oil cooling problem
for awhile. Did you replace the apex seal springs when you overhauled this engine?
Sorry if this sounds like the third degree. I am just trying to learn from this
experience.

Weak apex seal springs in conjunction with the rust or gum from the evaporated
gasoline could have caused the apex seals to stick. Have you tried spraying an
apex seal through the exhaust port with WD 40 and then trying to move it in or
out?

I would also take a small sample of the gasoline and two cycle oil mix you use and
let it evaporate in a glass dish. Then try various solvents on the residue if any.

If the springs have lost their temper, I doubt that any amount of WD-40 (or other
solvent) will be useful: there's nothing pressing on the back of the apex seals.

Sorry to hear of your troubles, Ed.

Russell Kent

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