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Author Topic:   repowering 15' striper
jokor3 posted 07-12-2003 05:43 PM ET (US)   Profile for jokor3   Send Email to jokor3  
I am in the process of replacing the existing motor on my 90 model striper and was hoping from some of your imputs on the best motor set up as far as total performane is concerned. 2 stroke vs. 4 stroke and also horsepower rating.
tully_mars posted 07-12-2003 10:30 PM ET (US)     Profile for tully_mars  Send Email to tully_mars     
If you look at the engine tests on Yamaha's web site as I did when I re-powered my Montauk last year, you will find there is little difference in gas mileage between plain old two stroke technology and 4 strokes in your range of hp. Being the former owner of a 1985 15' Striper, I would recommend just getting a plane old 2 stroke Yamaha 70hp. Extremely reliable, weight is matched perfect for the boat, and the performance can't be beat for that size motor.

Otherwise, with a 4 you will have to drop back to a 50hp or so since the larger size motors are quite heavier. IMO you won't get enough better gas mileage to justify the 4 stroke cost.

Tully Mars

Peter posted 07-13-2003 09:27 PM ET (US)     Profile for Peter  Send Email to Peter     
As Tully says. I just put a slightly used 70hp Yamaha 2-stroke on my 15 Super Sport. I was actually shopping for a 2-stroke 60hp when the 70hp came on the market.

Before I did that I calculated how long it would take to payback the extra cost of a 60hp 4-stroke (versus the 2-stroke through fuel savings at $2.00 per gallon running at an average cruising speed. The answer was about 700 hours. To put that into perspective, operating 50 hours season per season is considered normal for around here. 700 hours works out to 14 years!

However, if you do your boating on fresh water lakes, you may want to look seriously at the 4-strokes because some lakes will not permit 2-strokes. Until they reduce the weight on the 4-strokes above 50hp (if they are able), I agree that a 50hp 4-stroke is about the max you probably want to do on the classic 15' hull.

jokor3 posted 07-13-2003 10:17 PM ET (US)     Profile for jokor3  Send Email to jokor3     
I think I have narrowed it down to either a Yamaha 2 stroke in either 50, 60, or 70 hp. would like to know the performance differential and also the cost differential between these motors. Thanks to all that have and can contribute.
jameso posted 07-14-2003 09:31 AM ET (US)     Profile for jameso  Send Email to jameso     
To each his own. I recently went shopping for used power to push a 15 SS LTD. I wanted something late model but was not brand specific. After checking several marinas and shops here in the SE I found a 98 model 50 HP Honda. I am pleased with the engine. WOT speeds are 36 or so, good low speed performance. I do think most of the midrange 4 strokes are too heavy but the Honda only weighs 18X complete.
In regards to the quiteness of the 4 strokes IMHO this is over rated, I mean when you are sitting 5 feet from any engine developing 50 HP it is loud.
I like the OMC mid ranges on the 15, have owned several. I think the 60 twin with T/T would be ideal.
My 02, Jim Armstrong
captbone posted 07-15-2003 02:31 PM ET (US)     Profile for captbone  Send Email to captbone     
Go with the 70 hp. It is light wieght and if you want to go slower just pull back the throttle.

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