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1) Engine won't start, or difficult to start
Check fuel (quantity, condition, type) Check spark Check compression
- Twostroke Resources
Here is a method I've invented to remove gummed up piston rings on old pistons. This works most of the time for me and I was using it with a can of GT 85 plus a blow torch during the week on an old piston with unobtainium piston rings... All were saved!!
OK firstly inject penetrating oil into the ring gap of the offending piston with gummed up rings.
Next play a blow torch onto the crown lightly and hey presto, the oil boils and pushes the rings out. Works most of the time.
1. In most two strokes 120 + (PSI) is good, tho there are some weird motors that run less.
2. 6.5 - 7.5 to one is pretty typical swept compression (only counting above the exhaust port). 8.5 - 10.5 would be typical uncorrected ratios.
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