What are you trying to do? Are you thinking about swapping engines or using parts from one to fix the other?? Either way, it won't work. The lawnmower engine is a metric crank and a specific length for that application. The pressure washer engine does not have a flywheel brake (safety first!) and has a SAE crankshaft. You will most likely encounter more problems than it's worth. Too bad he buggered that up like that, but the gasket surface is still good. Someone that actually knows how to remove broken studs should be able to remedy that issue.