outboards: 2 stoke or 4 stroke

[timebandit]

Yes, your bigger 2 strokes (2 cylinder) motor produces 4 times the power pulses per revolution as a 4 stroke (1 cylinder) does.

Most older small outboard engines use a mechanical advance system connected to the throttle so if you are starting your 4HP in gear and at cruising speed because the boat is heavy and the motor is small, you might want to try starting it at an idle to elimanate kick back.

If the above is not true then you might want to try a little choke or push in the primmer button once to see if that will help.

Originally Posted by jrd22

I just bought the neighbors old Yamaha 8 hp two stroke to replace the brand new Yamaha 4hp four stroke I bought last year. I was really disappointed in the noise and vibration of the 4, and when warm it routinely yanks the pull cord out of my hand (even though I'm ready for it) when trying to start it. The noise is what really got me, much louder than the Nissan/Tohatsu 9.8 hp two strokes that I have had for years (single cyl. vs twin?). The weight and complexity of the four strokes really doesn't make much sense to me, but they do burn nice and clean. Wish I could still buy a new two stroke.