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Author Topic:   4 stoke or 2 stroke?
MikeC posted 08-24-2001 03:16 PM ET (US)   Profile for MikeC   Send Email to MikeC  
I am deciding on a new motor for my 13 sport and I am trying to decide what motor to get.Has anybody driven a boat with a Yamaha 4 stroke 40 ?Are they dogs? The weight of the 40 Yamaha 4 stroke is about the same as the 2 stroke so that would not be an issue.I cant decide.
karmannghia posted 08-25-2001 11:04 PM ET (US)     Profile for karmannghia  Send Email to karmannghia     
4 strokes!!! quieter, more won't regret it.
Erik posted 08-26-2001 12:57 AM ET (US)     Profile for Erik    
If you have the cash then go with the 4 stroke...remember that the weight that yamaha gives for that engine is for the short shaft version(15in.) the long shaft(20in.) has a bit more weight.
Peter posted 08-26-2001 09:08 AM ET (US)     Profile for Peter  Send Email to Peter     
I recall that the weight difference between 15 and 20 inch shaft length 2 strokes in a HP size suitable for a 13 was less than 10 pounds. I would think that the weight difference for 4 strokes would be the same.
1987GTX posted 08-27-2001 06:00 PM ET (US)     Profile for 1987GTX  Send Email to 1987GTX     
dont know where you are located and thus the air pollution rules you need to follow, but i live in CA and recently repowered my boat with a honda130 4 stroke and love the motor! can barely hear it at idle and at cruise it's only slightly louder. very expensive and heavier than the two stroke equivelant, but here in CA it's almost a must-have.


Flipper posted 08-27-2001 11:54 PM ET (US)     Profile for Flipper  Send Email to Flipper     
Mike, I think a four-stroke 40 may be too much weight for the boat.My brother owned a 13 with a 40 merc 2-stroke
and that extra weight really seemed to
exaggerate the "nose up" attitude during the hole shot. Then the boat would come down quickly; causing the prop to cavitate. The result was that the engine had to be "tucked under" (trimmed way down)excessively to counter this.
Not such a big deal if you have power trim,
BUT we also found the 13 likes to porpoise
once on plane, while cruising at level trim.
Every 13 I've seen with a large engine, it
seems,just has it's trim left "tucked".
The boat plows through the water,but its
the lesser of two evils.
I would take advantage of that flat bottom
and get something lighter. I like the 4-stroke idea, does Yammy make a ligher 30,
or is it the same block?

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