>  More tips... in the cellar, I had dug a '3 foot hole for another 
 > project... but I used solid 3/4" NPT that screwed right into the  
 > exhaust port of the head, and ran it into the hole, which was then 
 > floored over and vented to the outside.  incredibly quiet muffler. 
I'd never do this inside of your house; the danger of asphyxiation is simply 
too great if there's ANY leakage. I just saw in the paper yesterday that an 
elderly woman died of CO poisoning due to running a generator in her attached 
garage during a widespread power outage. Probably had the overhead door open, 
too.
 >  I can't recommend rebuilding a Briggs or Tecumse engine of this 
 > size unless you have antique reasons. Most have aluminum bores which a 
You're right on this point. Those engines are rated at about 500 hours of 
operation and are not meant to be rebuilt. They'll probably go a bit longer 
in generator service if they're not heavily loaded because of the clean 
environment (compared to a lawn mower or rototiller), but are still pretty 
much junk when they're badly worn. The Kohlers and Wisconsin engines can be 
rebuilt, but it's fairly expensive, and I'm not sure it's worth it when you 
also factor in the additional cost of the engine.
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