Forgive the basic question here, I've been away from small engines and mini bikes for twenty years. Do most of the small engines have a common mounting pattern or are Tecumseh totally different from Briggs small engines? The current cobbled up plate in my Shrike is set for a Briggs I/C 4 horsepower or similar, so I'm wondering if I'll be able to get a a HS 40 in there without having to drill into the plate. I'm assuming they were all different, but hoping against hope they may both fit.