Repower 21
 

Here is what I got want some opinions.
21' seacraft 2000 (i think or 2001). Right now 200 optimax on the back that we are going to re power.
I really really do NOT want to go with another merc. That said I think i am down to the following
200 etech
175 zuke
Want to go 4 stroke but afraid the 175 zuke may be underpowered?
Any 4 stroke yammy is going to be to heavy same with honda. 150 fourstroke is to underpowered.
Max weight on transom is 550 (i believe?)
Was curious if anyone had any experiences or opinions on this boat/or engine.
I am not trying to start an engine bashing thread.

also
there was a pdf file of the 21' seacraft spec sheet floating around this site can't seem to find it.

Never owned one, but i think a Zuke is a fine engine. I think the 175 weighs around 475 lbs and it's still a 4 cylinder.

I think both the 175 etec and 200 etec are 6 cylinders and both weigh in around 435 lbs.

If you are running a 200 opti now, and you like the performance i think you will disappointed with the 175 Zuke. 4 strokes in general just don't have the balls of a 2 stroke.

If you don't want merc, but you like the pep of that 2 stroke opti..........i think i'd be checking prices on a 175 and 200 etec.

Not to be confused with the original SeaCraft 21, below are some details on the recent vintage SC21. It's a different animal than the SC20. 10 " longer, 6" more beam and 900 lbs heavier.

http://www.bustersmarine.com/SeaCraft/seacraft21CC.html

I think you get 45 mph, and close 4mpg at cruise with either option. The etec is a bout 40 lbs lighter than the zuke. The gear ratios and subsequent propping allow the zuke to swing more prop, im not sure if its enough to offset the "pop" mrobertson mentioned.

That late model 21 is basically a shortened 23, so it's got more beam, weight and deadrise than a 20. The small block 2.6L V-6 E-Tec is a great motor with a far better power/wt ratio than the 4 cyl. 4-strokes, and almost too much power for a 20. However you might like the extra torque of the 524 lb big-block 3.3L V-6 better on the 21; although it's 22% more displacement, I suspect actual fuel burn of a lightly loaded motor will be within about 10% of the smaller motor that's working a lot harder. Optimum cruise on the 2.7L is about 3700-3800 rpm which gives me about 25 kts at 36-37% throttle opening on my 20. I can easily get on plane at about 45% throttle. I averaged 4.3 mpg on my 700 mile S. Fla. circumnavigation trip a couple of years ago. We had flat seas, but I was loaded heavy and also cruised at about 30 kts on some long open stretches where fuel economy was not a high priority. Although my Seafari is the heaviest of all the 20' models, the same motor would have to work much harder on a 21.

The 200HO and 225 are strong running motors and very conservatively rated. The "225" is actually about 245 hp and I suspect the HO is probably close to that since they're the same block!

Mr robertson that is one of my concerns.....is that 4 cylinder going to be enough HP for that boat.
Boat is used mainly in mid bay area with a couple close offshore trips out of OCMD. Mainly fly fishing and light tackle. So top end speed is not a priority as much as efficiency is. Also hole shot isn't either as long as it will plane with a heavy heavy load.

Thank you mcgill that is it.

Any other opinions?

I believe the Yamaha 200 hpdi is still available as well. 475lbs

200 hpdi
 

Fished a lot on a Regulator 21 with a 200 hpdi. It was a great motor and would probably do well on a SC21.

Her are a couple of performance tests on the same model boat:
http://www.suzukimarine.com/en/Produ...20Open%20DF175

http://www.evinrude.com/Content/Pdf/...orts/PE684.pdf

I would expect the SeaCraft performance to be a wee bit better than that of the Dusky but the Dusky benefits some from the bracket. The 4 cyl zuke acutally has 250 cc more displacement than the etec