I freed up a badly seized antique Lawn Boy by adapting the spark plug hole, through a series of fittings, to a grease zerk. Grease gun provided the hydraulic pressure and popped it loose pretty quickly. It also made a terrible mess.
On a 4 stroke engine, you’d have to know which cylinder(s) were the problem and would have to loosen the rockers to get valves closed. And even then, you might have to inject a LOT of grease, before anything happens.
I like Jerry’s hole saw idea much better for your situation.
Last edited by JW51; 02/11/2022 5:31 PM.
