Hi folks! I has repaired the OS Max 10 FP and got the engine to run as a new engine.
I maked the new sleeve who are higher than old sleeve with contrapiston added inside. Sleeve are made of torsion bar from old car, the piston and contrapiston from old camshaft. Used 2 screws at cylinderhead only. Cause the treads in crankcase are damaged of early owner when he tried to fix the treads.
The engine ran 11500 rpm with 8x3 propeller.
No way back to glowengine again.
Jens Eirik