Re: Modifying 2000 Yam 4stroke
I agree the Glastron test is not a good comparison. I didn?t note the significant ?Weight as Tested? difference between the two. Looking at the Skeeter test the weight difference is 229 lbs. Likely enough to give a slight top speed advantage to the 2-stroke. Your point that 2-strokes don?t have to rev as fast to make the same speed, I don?t see here. Comparing the Skeeter tests, at 4000 RPM, a reasonable cruising speed, both engines are within 1/2 MPH with the 4-stroke delivering about 26% better fuel economy. At WOT the 4-stroke delivers 33% better mileage. My original point, however, is that CajunShark wouldn?t see a performance increase by hanging a Yamaha 2-stroke on his boat. I can produce many performance reports from various manufactures and HP ranges to demonstrate that 2-strokes, including the new generation of DFI 2 ?strokes, will not push a given hull significantly faster than their 4-stroke competition. In fact, the 4-strokes often will produce slightly better top speed, better cruising MPG, and lower noise levels. As I said before, hole shot is better with the 2-strokes, although, this advantage will diminish as more manufactures follow Suzuki?s path with variable valve timing technology.
