Did this particular style snowblower engine go away, when Tecumseh went away? Reason I ask is, we've got 3 MTD 2-stage snowblowers in the family. All of the same late 1990's to early 2000's vintage. All three have the pain in the rear, impossible to get, twin shaft engine, where the auger is driven off the main shaft and the wheel drive is driven off the smaller, counter rotating cam driven shaft. Never could figure out WHY MTD designed them like this, because some were twin shaft, some not. Basically makes it impossible to repower with a standard engine unless you want to do some serious engineering and fab work.