So I have an older briggs 2 hp that I have been working on. I did away with the old points and condenser system and installed a solid state coil. From there, I have done a valve job and thorough cleaning of the engine. Has great compression, the carb while admittedly old is certainly usable and is completely clean. Engine has great spark using a tester, the plug is of the correct variety and has had the correct gap set. The engine will not so much as cough, even with fluid sprayed directly in the intake and down the head itself. The flywheel key is brand new, and the flywheel magnets and coil are rust free. I have done all I can to sort this puzzle out, and would greatly appreciate any input anyone has to offer.