I have had 2 troy bilt Horse models.  An 86 with a 7 HP Kohler and I purchased a new 8HP Horse in 92.  They are GREAT machines, makes me sick to see the MTD versions that are for sale in the "box" stores.  I compared to BCS tillers but the troy is more heavy duty. I didn't need multi-function machine so I got a Troy.  I plan on this 8HP Horse lasting me the rest of my life, when the Kohler wears out I will put a 10HP Honda on it.