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Author Topic:   repowering a 13
pfbalser1 posted 03-05-2003 07:53 AM ET (US)   Profile for pfbalser1   Send Email to pfbalser1  
any thoughts or experiences on the 25 hp 4 stroke yamaha? the weight seems to be ok, but still 45 lbs heaver than the tried and true omc 2 strokes. looking for feedback, please. the boat will live on a trailer, and be split 50/50 casco bay, maine and the lakes. thanks -
Mumbo Jumbo posted 10-07-2003 01:05 AM ET (US)     Profile for Mumbo Jumbo  Send Email to Mumbo Jumbo     
I know this is late but it may be of help. I have a 3 year old 25 hp. four stroke Yamaha with power trim and tilt on a 1973 13 Whaler. It has a PowerTec stainless prop. This is a fantastic engine for the 13. It has planed five adults (barely) and planes four in small seas. it is the ideal engine for the 13 when used primarily with two or three people. I have owned a 13 since 1960 and have powered them with motors from 50 hp. to 9.8hp. I would have no engine but the Yamaha 4 stroke 25. It needs to be mounted about 3" higher than the top of the mounting bracket would suggest. This gives better high end performance and allows the engine to be tilted up and to run the boat in about 8" of water. The power trim feature is mandatory in my estimation since it gives you great control over boat trim which is important for the 13 with two people on the rear seat.
whalerwon posted 10-13-2003 02:43 PM ET (US)     Profile for whalerwon  Send Email to whalerwon     
I have a 1997 mariner 2 stroke, four cyliner magnum engine. I specifically bought this engine for its weight and persormance. It is about 20 lbs lighter than the johnson 40. It idles better than the johnson and has an integral oil tank. 97 was the last year before merc/mariner switched to a 3 cylinder 40 which is heavier than the johnson 40. If you can find one of these 40 hp from 90-97 I have had great experiences
GlennGlenn posted 10-14-2003 06:30 PM ET (US)     Profile for GlennGlenn  Send Email to GlennGlenn     
I own two 13 footers, a 1986 and 1987; I run a 50 HP Johnrude 2 stroker on the 1986 with Power trim and tilt and
run about 47 MPH on GPS on full trim with one person.

I'd go with a lighter 2 stroker 940 HP Johnson or yamaha) and mount it high for max performance and also shallow water running.

I run this in Lemon Bay Florida and surprise a LOT of larger boats with the top end.


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