repower

[SECF3114M73J]

The '78 200 may or may not be more efficient than the Verado,but at least the boat would be floating.

[Mark]

Wow, in 30 years they have managed to more than double the weight and the price!

[SECF3114M73J]

In 1977 I bought a 1976 175 Merc. If memory serves me right 76 was the first yesr for the V6 Black Max.The motor was a new in the box left over. I paid $2700 installed.

[Bigshrimpin]

Verado is also a straight six, which is also somewhat ironic.

[NOAHSARK]

DUNK THANKS FOR YOUR POST ON THIS TOPIC I FOUND IT TO BE VERY INFORMATIVE [img]/images/graemlins/smile.gif[/img]. MAYBY YOU CAN HELP ME OUT,I AM ONE OF THE SEVERAL GUYS THAT HAS GOT A 225HP JOHNSON HUNG ON MY 1988 20'SC IT'S A 1992 MOTOR. WHEN I ORIGINALLY PURCHASED THE BOAT BEING OVERPOWERED WAS ONE OF MY CONCERNS. I DID SOME RESEARCH AND FOUND OUT THAT IF I WAS TO GO DOWN TO A 175HP I WOULD ONLY HAVE DROPPED ABOUT 60LBS, SO I DECIDED TO RUN HER AND SEE WHAT KIND OF PERFORMANCE I WOULD GET. I HAVE TO SAY THAT UNTIL NOW I HAVE HAD NO PROBLEMS, I FEEL SHE SITS REALLY NICE ON THE WATER & SHE DOSENT SEEM TO BE TAIL HEAVY (I WILL POST PICS TO GET SOME OTHER OPINIONS) ATER READING THIS POST I SUDDENY FOUND MYSELF WITH DOUBT AGAIN. [img]/images/graemlins/confused.gif[/img] AS ALWAYS ANY AND ALL OPINIONS ARE GREATLY APPRECIATED. [img]/images/graemlins/wink.gif[/img]

[Ryan]

Noahsark, I wouldnt be to worried if youve been running the boat and dont have any stern issues. Ive seen quite a few 20s with 225s

[sailcat]

I just went on a sea trial in a (72)20' CC with a 150 Yamaha 4 stroke. No problems what so ever with water coming in. The 4 stroke has a much different power band though. It didn't seem quite right too me. I have a Johnson 200 on my 20' with no problems.

[toadfish]

I have a 1986 18' Seacraft with a 1991 Mercury 200 offshore engine on it. The engine was on the boat when I purchased it and had a seized piston due to an oil injection problem. I too looked long and hard at re-powering with a smaller engine. However, I found that some of the smaller engines (175, 150) are actually HEAVIER than the 200. I don't remember the exact weights, but I spent a lot of time on the NADA site. Someone also told me that the 200 v6 block is the same one used on mercury's 150 and 175. The only difference is the bore, and some electrical. Anyway, I decided to re-build the engine myself and removed the old oil injection system. It is now a pre-mix engine and has been running strong for about 3 years. While I will agree that the horsepower may be a little much, the weight does not seem to be a problem. I rarely drive the boat more than a good cruise speed, but it is nice to have the extra power if you need it....Toadfish

[Fr. Frank]

The 20' Seafari is even heavier than the CC, and will run just fine with a 115. My first Seafari was a 1973, 1830 lbs hull weight, dealer equipped with a '74 115 Mercury. Cruise was about 24-25 mph, top speed was about 29-30. I repowered with a '77 1500XS which gave me a cruise of 34-35, and a top speed of 45-46 mph.
My current Seafari is a '72, hull weight is 1870 lbs, and I got it with a 1972 Chrysler 120 hp. It planed easily, cruised at 22-23 mph, and had a top speed of 26 mph. I installed a 1991 Mercury 150 XR4, with the big gearcase and a Bob's nosecone. Top Speed light on fuel with just me is 46 kts on the ol' GPS, which I think is about 51 mph. Cruise is 34-35 mph, just like the 1500 XS. I have a higher top end with the V6, but not significantly higher. The real beneift is that the XR4 is better on fuel.