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This one is for the 2 stroke Detroit experts. 3-71 out of my AD3. The previous owner said he was running the machine, and it backfired, then after that, it smoked heavily and had no power. Been racking my brain (and there ain't much there) trying to figure out what could have went wrong. After I was all loaded up at this previous owners place today, and about ready to drive away, he tells me just a minute. I have one more thing for you. He came back with a NOS blower seal kit for this engine. I asked him if he had got it because he thought that that was what was wrong with the engine and he said no. He had just got that seal kit because it was on ebay, it was cheap, it was for this engine, and thought that if he ever needed it, he'd have it. But after I left his place, I started to think that maybe, it's possible, that giving the symptoms of the engine that he did, maybe the blower seals are all that is wrong. Does that theory add up at all. I mean, I really don't know what a 2 stroke Detroit does when blower seals go out, so I am just guessing or wishful thinking. Any thoughts. ..? Thanks Darrel

Or could the supercharger shaft broke?

Isn't that a motor under the right circumstance they can run backward?

DanWi wrote: Isn't that a motor under the right circumstance they can run backward?

blower seals and oil consumption and erratic running if to much oil is sucked into engine . 

As far as I know, the allis engines had the kill flap on the intake side of the blower, and if flapped, it will die... Seen truck 6-71 engines have the flap between the blower and the engine., once tripped, they were manual reset.
  But a backfire first?? I would think more in a cam... or the governor linkage maybe.
  Weep holes in the air box could be plugged to not allow oil to escape.
 My HD15 had oil imn the airbox and when dozing, and point the nose up or down, it would reallt take offand had to grab the kill knob several times... and an hour of play would make ye look like a well oiled black man.