BobP said:
What about ETEC 200 small block, why go to 175, same weight.
When I first got my boat I considered trading or selling off the F150 for an E-tec for better performance. For mostly all ocean work the 150 has proved sufficient.
When I was looking at the options on the E-tec's, the price difference was at least a grand between the 175 and 200 small block. And if you look at the power curve you only see the additional HP at wide open, top speed. I figured that I never run my motor at that speed so I would not benefit from the additional 25 hp. At cruise rpm the torque and hp output is virtually identical. Afterall, they are the same block, just tuned to run up just a hair more on the 200.
I do like the e-tec's though. I had a 75 on a RIB and it was great. I ran the Amsoil HPi oil and it didn't smoke, was quiet, and on a 15' boat as fast as hell. I didn't bother with the 100:1 tune, to me it was handier to be able to use any good TC3 oil. I'll bet the HPi oil would be fine at the lean setting, would be worth checking with them on that. Under warranty of course, you have to stick with the factory spec.
The flush port on the back is handy, they have a built in fogging process for storage. And with no valves, maintenance is greatly reduced. They are computer controlled so start and run like a four stroke. They are very common on fleets, rentals, and government craft. You wouldn't find them there if there was a problem. I would take one over an Optimax any day.
EDIT: BTW, the primary complaint with zuki's is lack of dealer network. They're great if you have someone close by to do service work if you need it. To me, especially here in so-Cal, and because I'm a DIY for everything, would not bother me in the slightest. If you get to out of the way places though, you can still get service for a yam, a merc, or a 'rude, but might be a different story with a zuki or a honda.