I think I just blew my vanguard engine on my great dane standup mower. The linkage to the governor came off. engine rev up, I shut engine down, engine started making clanking noise. I reattached linkage to governor, restarted engine, still made clunking noise and now has locked up. Did not lock up while running, but when I try to restart, it locked up. Any one have any Idea of what the problem could be? If engine is blown should I rebuild or buy new? estimation as to how much to repair or rebuild?