you putting your engine at bottom dead center after you run it?....alot of things could cause it to stop running..overheating the engine, something breaking, loss of fuel or the glow plug to go out...

can you rotate your engine by turning the flywheel?...does it turn free or does it have spots it turns hard?.....have you removed your glow plug and checked to make sure it is good?/

most likely your wheel bogglein is due to a broken wheel