Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

I've got a Yardman 644E, 8hp/24".  I ate a brick which stopped the auger, the shear bolts did not shear, two auger drive belts snapped.  I've replaced the belts, but had a difficult time starting the engine.  It ran for about ten minutes and the snow flew out of the shoot, so I'm thinking that part is repaired, but the engine putters to a stop after a few minutes.  It was running great prior to the brick.  I was hoping for a quick fix--gas line maybe?  So I changed the gas and checked the fuel line.  Looks okay to me.  But, the engine isn't doing well at all.  Timing?