100hp on a 20 sf?

[DonV]

The "ESD" is correct.....It's not all WOT. It's how it performs with a load of people, tackle, fuel, coolers, ice, etc. Does it get on plane properly?? Run well in all sea conditions, even emergencies?? Provide optimal fuel mileage with little strain on the engine at cruise??

I've been at WOT once, however was not able to catch a single fish.

[Fr. Frank]

I have a '72 Seafari 20', '06 Mercury 90 hp Optimax with 13.25"X21P 4 blade and skeg-mounted Hydro-shield. WOT 33-34 mph, cruise 24 mph at 5.1 mpg. Planes quickly.

Remember, the most common original equipment motors on these 20' SeaCrafts were the 85 hp and 115 hp V4 Evinrude/Johnsons, or the 90 hp or 115 hp inline 6 cylinder Mercury motors. As a SeaCraft dealer, I have even rigged a 20 SeaCraft with a single 70 hp motor, and it did fine. There is also another member with a 20' Seafari rigged with a Mercury 80/85 hp two-stroke 4 cylinder. These hulls don't need all that extra horsepower.

But if you want to put the extra power on, they'll handle it just fine. Locally, there's a 20' 1971 SeaCraft Superfisherman with a Porta-Bracket and a 250 Yamaha HPDI that runs like a raped ape. (Of course, he only averages 2.5 miles per gallon.)

[intergalactic]

This is a good thread to read. I was wondering about a Honda BF90 on a bracket on a 1971 SF20. The bracket is aluminum, but i will foam fill it. A honda BF90 is 370lbs more or less. I don't need more than 30 knots, and a bit less is fine.

[McGillicuddy]

No need to foam fill the bracket if its already a closed hollow chamber. If you don't already have the Honda you might consider an Etec 90 for your application. You will cut the weight by 50 lbs and get every bit the of the 4 stroke economy.

[intergalactic]

I don't know anything about the etecs. I know I love my other Honda because it ALWAYS starts. The economy is nice as is the lack of two stroke fog.

I was even thinking dual 50s and no kicker with a flotation bracket. I have no motor yet. Heavy, but lighter than a motor and kicker.

[Fr. Frank]

If you're thinking twin 50's, think twin 60's by Honda or Evinrude, instead. The weight and fuel consumption is similar, and the power is 20% greater.

[FishStretcher]

Any opinions on the Yamaha F100? There are a few available on Craigslist used. And ther are 356 lb.

Looking for modest reliable performance. 4 stroke is a must.

[Yz2009]

Ive got a 99' F100 and its a great motor. Only thing is dont let gas sit for a long time in the carbs or it will get gummed up and they will have to be cleaned. The only issue ive ever had with it, is the voltage regulator went bad last season. So 11 year old motor and only issue to date was a voltage regulator. Always starts first crank as long as youve got good gas.

[FishStretcher]

I just bought a F100 for my 20 M.A.

What prop do you run, and do you run a fin? A new prop is in the budget.

Ive got a 99' F100 and its a great motor. Only thing is dont let gas sit for a long time in the carbs or it will get gummed up and they will have to be cleaned. The only issue ive ever had with it, is the voltage regulator went bad last season. So 11 year old motor and only issue to date was a voltage regulator. Always starts first crank as long as youve got good gas.

[Mark]

Looking for modest reliable performance. 4 stroke is a must.

You just described SUZUKI