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Author Topic:   increase preformance on merc 25hp
Richard Thomas posted 06-13-2000 11:17 AM ET (US)   Profile for Richard Thomas   Send Email to Richard Thomas  
I have a mid 60's 13 ft whaler with a 1980 merc 25hp motor. Is there any thing I can do to increase the preformance. It runs fine when I'm alone, but add my wife, dog and a head wind, I'm dead. Any suggestions?

Also what is a Doel Fin,and what does it do?

Thanks for your help.


whalernut posted 06-13-2000 03:51 PM ET (US)     Profile for whalernut  Send Email to whalernut     
Richard, I don`t know what you can do to boost up the power in a 25h.p. engine. But I used to have a 1971 `13 Whaler with a 35h.p. Evinrude and with up to 4-5 people in the boat, it had a lot of power, I don`t know if another engine is an option for you or not, but the 35h.p. Evinrude was an awsome engine and strong. It was a 1976 2cylinder model. Regards-JACK.
Clark Roberts posted 06-13-2000 06:05 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Richard, the 25 Merc is a small engine for it's power at 24 cubic inches... not much you can do to increase power... a good tune up (clean carb, new plugs, set timing etc) will help make sure you have the advertised power... try a lower pitch prop (by at least two inches)! This will allow the little engine to make more rpm and breath.. you may never have had it at top power(which is 6000rpm).. a doel-fin is a hydro-foil which bolts to the anticavitation plate and should give you a better hole shot...will not make boat go faster.... suggest you get one and install per instructions... 25 hp should be ample for two adults, dog , gear, wind etc.., that is with the right prop! happy Whalin'... Clark
Eric posted 06-13-2000 09:01 PM ET (US)     Profile for Eric  Send Email to Eric     
I had a 68 13 with a tiller Evinrude 25, 88 model. It would run 30 mph on the gps, and mid 20s with a load. Checking out your prop and making sure that the engine is in tune are good suggestions.

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