i had a 4 hp staionary engine with a long time stuck piston i stood it on end fillred yhe cylinder with acetone and put a stick for a wick in it put a couplr propanr torches on it for about 8 hours a nd with a 2 x 4 knocked it out without too much effort had to sleeve it but its been running...
you can diagnose many things with a scope even weak cylinders lean mixtures.have used them for 50 years still have one.that style wont work one the new cars