Rather than pressurizing with air, use oil in a grease gun. It won't propel parts like a cannon, as air might. Use flex hose with copper tubing and compression or flair fittings. Will develope several hundred psi easily. Good hydro Test method as well.
I think you had carbon built up on the pistons and rings. And stuck rings as it is variable with temperature. 2 strokes are known for carbon fouling. Also coked oil deposits on any art subject to heat. It forms st higher heat and tom and when it is cold the parts are no longer expanded and it...