Originally Posted by Celestialsailor
You kinda contradict yourself there...but I can tell you as a motorcycle mechanic
in another life, 4 stroke develop more low end torque than a 2 stroke. 2 strokes are lighter and also wear out faster.
You pop a boat out on the plane at higher rpm
. 2 strokes are well known for better hole shots in big hp sizes.
That's why a four stroke for a pusher. Lower rpm
pushing more weight on a displacement
boat, less fume, less fuel used.
Regarding lifespan, I recently sold off a Yamaha 5 hp of the same design as my new one. After 35 years it finally gave up the ghost with corrosion
punching a hole through the water
jacket. Aside from being cantankerous to start and having a bit of a flat spot mid range, it ran as well as it's identical replacement. I obviously hadn't owned it for 35 years but I'm reasonably sure it didn't spend it's life sitting in a shed. If I can get that life out of the new one I won't be complaining.