yep, the right chainsaws can make for perfect engines!
stihl ms180/170...complete separate crankcase to frame. makes for compact engine
can pull near 10 horsies at 14k
mind you, so can most brushcutters with some work and a pipe
need mechanical skills to fit them properly... ie, you need to think clutches and starting once engines stripped bare. slip belt manual clutch
easy. reduction. 16:1 or thereabouts, depends on wheel diameter.
being dodgy and hanging one off the side with a roller on the wheel is a waste of a good chainsaw engine!
whereas some chainsaws only have a cylinder/halfcrank, the rest is part of the case, attached to the oil and fuel tanks, etc. USELESS.