Originally Posted by CruisinGA
I generally agree... but my buddies single cylinder 6 hp 4 stroke turned lower rpms and was quieter than my old 6 hp... really quiet under 1/2 throttle. I think thru-hub exhaust plays a role here.
Thats consistent with my experience. The later 2-strokes from the 70's and 80's rev quite a bit higher than the 2-strokes from the 50's and 60's (5000 vs. 6500 rpm WOT). Neither is particularly quiet or efficient.
The new 4-strokes are way quieter than any of them, and way more efficient. Theyre also significantly heavier, which is particularly noticeable on these light weight, low hp applications- giving them a significant performance disadvantage.