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Old 08 March 2011, 07:55   #1
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New Engine???

Hi all I have an "AB Inflatables tender model 13 ALX"
it has a Yamaha 40hp 2-stroke on the back and I want to change it to a 4-stroke
the plate says "engine = 37.7KW 50hp"
should I go 40hp or 50hp will there be much improvement in performance with a 50hp i know power to weight ratio 2-stroke´s are better.
now which make do you all recommend?

Thanks in advance
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Old 09 March 2011, 15:19   #2
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Country: UK - England
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Originally Posted by Pudd View Post
Hi all I have an "AB Inflatables tender model 13 ALX"
it has a Yamaha 40hp 2-stroke on the back and I want to change it to a 4-stroke
the plate says "engine = 37.7KW 50hp"
should I go 40hp or 50hp will there be much improvement in performance with a 50hp i know power to weight ratio 2-stroke´s are better.
now which make do you all recommend?

Thanks in advance
First thing i would do is see if the plate also says what the max engine weight is. Because im guessing that a Yam 2 stroke 40 will be about the same weight as a 30hp 4 stroke. So if you bolt on a 40/50hp 4 stroke on the back you might have some weight problems!
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Old 11 March 2011, 16:55   #3
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Engine: 250hp
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Quote:
Originally Posted by Pudd View Post
Hi all I have an "AB Inflatables tender model 13 ALX"
it has a Yamaha 40hp 2-stroke on the back and I want to change it to a 4-stroke
the plate says "engine = 37.7KW 50hp"
should I go 40hp or 50hp will there be much improvement in performance with a 50hp i know power to weight ratio 2-stroke´s are better.
now which make do you all recommend?

Thanks in advance
Go for Evinrude E-Tec. They are in fact 2 stroke with direct fuel injection, so fuelwise they are even better than the Yamaha 4 stroke I have, and their weight is MUCH MUCH less than a 4 stroke. Let alone the torque...
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Old 14 March 2011, 15:44   #4
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thanks guys there is no weight on the plate solo for the engine but there is a combined weight for people and engine
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