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  13-Foot: Performance with Tohatsu 25-HP Two-stroke; Performance with 18-HP and 15-HP Motor of Various Brands

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Author Topic:   13-Foot: Performance with Tohatsu 25-HP Two-stroke; Performance with 18-HP and 15-HP Motor of Various Brands
jkh posted 05-06-2004 11:32 AM ET (US)   Profile for jkh   Send Email to jkh  
What is the performance of a Tohatsu 25-HP Two-stroke motor? I am still searching for a motor for my 13-foot Boston Whaler boat. I am considering a Tohatsu or a Nissan 25-HP two-stroke with electric start, short shaft, and tiller steering. The motor costs $2,500 after tax. Any recommendations or thoughts [about the Tohatsu motor]?
brisboats posted 05-06-2004 02:19 PM ET (US)     Profile for brisboats  Send Email to brisboats     
I have an 18-HP two-stroke outboard motor with a tiller on my 13. Runs like a watch and no matter how hard he tries my young Nephew cannot seem to kill it. Weighs less than my Mercury 25 and is close in power.


csj posted 05-07-2004 07:43 PM ET (US)     Profile for csj  Send Email to csj     
[Changes discussion to the general performance of a 13-foot Boston Whaler boat with a 15-HP motor instead of a 25-HP Tohatsu motor.]

Brian, on that note, I just picked up a 1966 13' at an auction, and only have a 2 stroke 15 hp motor. Will this engine allow the 13' to plane out, and what speed can I expect ?

csj posted 05-07-2004 07:47 PM ET (US)     Profile for csj  Send Email to csj     
Brian, just looked at your profile and noticed your a Howard County resident. I work for howard county, and reside in catonsville. Would like to see your 13' reference restoration tips. The 13 is for my 8 yr. old son. We also have a 22' revenge which is kept on the severn. Currently at the house being waxed !
brisboats posted 05-07-2004 08:26 PM ET (US)     Profile for brisboats  Send Email to brisboats     
csj, hello neighbor! My boat is a 1966 also and is run with a 18-HP described above and sometimes a 9.9-HP Mercury four-stroke. Both will plane it off. I converted mine to a standard. I removed the side console and the original 33-HP OMC outboard motor that still ran fine. I am putting the 13 in this weekend at the cottage, Rhode river. Let me know if I can help you out with yours.

I think you could expect about 15 mph with the 15-HP. I have never carried a GPS receiver but it feels like my 18-HP with just me is just nearing or breaking 20-MPH. My current Whaler projects are the 1974 Montauk and a 1994 RAGE 14.


squiggy16us posted 03-14-2006 08:28 PM ET (US)     Profile for squiggy16us  Send Email to squiggy16us     
[Returns to original topic of the performance of a 13-foot Boston Whaler boat with a 25-HP Tohatsu motor.]

Yes, I have a 25 Tohatsu two-stroke. I use it every day between April and October. It's very fuel efficent, and I've had no troulbe with it at all. I would recommened a Tohatsu to anybody. Good Luck

jimh posted 03-14-2006 08:44 PM ET (US)     Profile for jimh  Send Email to jimh     
Tohatsu motors have a good reputation. Mercury buys many of them and re-badges them as Mercury motors. I think Mercury and Tohatsu now have a joint production facility in Japan to manufacturer smaller outboard motors.

The limitation with the Tohatsu brand is the dealer network and service. If you have a good dealer near you, it would be better.

According to the factory, the 13-foot hull can be operated with a 9-HP motor and still reach plane, although probably only under optimum conditions and minimum load. See:

RJG posted 03-14-2006 09:23 PM ET (US)     Profile for RJG  Send Email to RJG     
When I was a kid growing up on the bay in Sarasota, Fl. one of my friends had a 13 Whaler with a 18 hp Evinrude. This is the late 1960's and I was still in single digits age wise. To us that boat was the greatest. For a bunch of little kids that ol' 18 Evinrude was all we ever needed. My point is that a 25 will be ok if it suits your needs. It will plane satisfactorily with a light load and sip fuel. Though not a sexy name tag, Tohatsu enjoys a very solid reputation and I was close to putting one on my son's 13 before I found a super deal on a non current 40 Yamaha 2 stroke.
FISHNFF posted 03-15-2006 03:40 AM ET (US)     Profile for FISHNFF  Send Email to FISHNFF     
I have a 1968 13 with a Nissan 18 4-stroke.
I am still making the hull look pretty, but when I test drove the boat, it had me (180), my son (40), and the seller (220). Planed nicely, and ran around pretty good.

How fast?
Didn't have a GPS aboard, but seemed fine.
I had a 1981 13 with a 50 Yamaha, and there is no comparison. But the 18 4 stroke purred like a watch.

I bought the 13 to take to the lakes with my 2 boys, now 4 and 7. They have a hard time seeing over/around my console on my 17, so I got this little beauty.
I guess it does around 20, maybe a tick more. Half the speed as my previous 13, but I can enjoy the scenery much nicer with my boys.


mercenary5 posted 05-31-2006 08:51 PM ET (US)     Profile for mercenary5  Send Email to mercenary5     
tohatsu makes merc under 10hp and all nissans
fittongr posted 06-01-2006 01:40 PM ET (US)     Profile for fittongr  Send Email to fittongr     
i have a 69'standard (13 ft.). i am looking at a yamaha 2 stroke, pull start, short shaft, tiller steer. the price is $2,388.00 with tank & hose. do you think the tohatsu is a better motor? how much does it weigh? what is the top speed with a tiller 25hp? i need advise.
afishinado posted 06-02-2006 09:54 AM ET (US)     Profile for afishinado  Send Email to afishinado     
I have a 80's 13 with a 25 Johnson 2 stroke. Never clocked it, but it's probably somewhere in the 25mph area. I have a 16 year old and needed to have less than 10hp until she turned 16 (NJ law), with a 9.9 it scooted around pretty well (maybe 15-18mph). It would plane with myself (225lbs) and my 80lb golden retriever without any problem. Great thing about the 9.9 was you really could leave it without the plug and no water was on the deck.
dgoodhue posted 06-02-2006 12:21 PM ET (US)     Profile for dgoodhue  Send Email to dgoodhue     
I think the 15hp tiller will do closer to 20mph with one person. In the late 80's my father had another boat that I know did around ~20mph with a speedometer (This was before GPS though) and a friend had a 13 with 15hp Tohatsu and it seemed dead even.
dgoodhue posted 06-02-2006 12:25 PM ET (US)     Profile for dgoodhue  Send Email to dgoodhue     
I was driving 13' with console and a 4S 25hp Yahama. My father was in another boat with a GPS was dong 27moh, he was slightly pulling away, so I would say 25mph is a pretty good guess. There might be a slight weight advantage with out the steering and a lighter 2 stroke motor.

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