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Author Topic:   Four Stroke for 13 ft Whaler
cowgirl posted 05-10-2004 03:59 PM ET (US)   Profile for cowgirl   Send Email to cowgirl  
We have a 13 ft Boston Whaler, circa 1998, that currently has a 25 hp merc outboard. We'd like to replace the merc with a 30 hp four stroke outboard. However, we are concerned about the weight. Also, we'd appreciate advice on makes. Any help would be great.
JBCornwell posted 05-10-2004 06:06 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Honda has a fairly new set of engines in that range that are very light for four strokes. I have heard, second hand, that they are as light as comparable 2 strokes. However, they have carbs.

On the other hand, I think the 13 would handle the weight of Merc's 30hp EFI 4 stroke.

If lightweight is your top priority, go Honda. If the user friendliness and reliability of EFI comes first, Go Merc.

Red sky at night. . .

Mumbo Jumbo posted 05-10-2004 09:01 PM ET (US)     Profile for Mumbo Jumbo  Send Email to Mumbo Jumbo     
You might consider the 25 Yamaha four stroke with power trim and tilt. This engine weighs 156 pounds and is more than adequate for two adults and all the gear they could reasonably carry. I have planed four adults with mine. Prop selection is important. My 25 has a PowerTech three blade stainless prop that provides good performance. The power tilt and trim feature is mandatory for good trim and optimum performance.
rbruce posted 05-10-2004 11:55 PM ET (US)     Profile for rbruce  Send Email to rbruce     

Why are you replacing the Merc 2 stroke with a 4 stroke?

Buckda posted 05-11-2004 12:03 PM ET (US)     Profile for Buckda  Send Email to Buckda     
When speaking with my canvas guy on Saturday morning, a pretty little 1999 13' Sport GLS was in the driveway, and the owner stopped by to pick it up (She had just had a red mooring cover put on). After a mutual exchange of "nice boat" we discussed the differences between the two.

She has a 40 HP four stroke on the back and is VERY pleased with it (quiet operation, throttle response, etc.).

I don't think you should have to worry about the 30 HP.

just for what it's worth..

Mumbo Jumbo posted 05-12-2004 01:16 AM ET (US)     Profile for Mumbo Jumbo  Send Email to Mumbo Jumbo     
The Mercury 30 efi for a 20" transom weights about 225 pounds with a stainless prop. That is really a lot of weight for a 13. There are other engines which weight a lot less which will give good performance on the 13.
andygere posted 05-12-2004 11:44 AM ET (US)     Profile for andygere  Send Email to andygere     
The Tohatsu/Nissan 30 4-stroke weighs only 150 lbs, making it a good choice for the classic 13 hull. These motors are reasonably priced, and have a reputation for reliability. They offer several choices in 2 and 4 stroke configurations that are ideal for the classic 13's, including the pre 1973 models that require a 15 inch shaft.

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