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Outboards specifications
#4290641
02/23/25 10:00 AM
02/23/25 10:00 AM
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Joined: Nov 2013
Posts: 3,017
Prattville Al.
capehorn24
OP
10 point
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OP
10 point
Joined: Nov 2013
Posts: 3,017
Prattville Al.
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The Cal boat fire kinda got me going down the rabbit hole. Got looking at some outboards in the 400-450 range, Yamaha by default.
f450- 4 stroke 32 valve, dohc, 60-degree v8, 5559cm3 displacement, 96x96 bore/stroke, 331@5500(max shaft output@rpm)
f400—————————-same specification as above till——————————————, 294@5500
Why do we have different outcomes am I just being stupid, what am I missing? never been a gear head but displacement, bore, stroke and rpm same but different outputs
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Re: Outboards specifications
[Re: capehorn24]
#4290643
02/23/25 10:04 AM
02/23/25 10:04 AM
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Joined: Jul 2014
Posts: 414
Central Alabama
cmontgomery
4 point
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4 point
Joined: Jul 2014
Posts: 414
Central Alabama
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Computer chips probably. Only difference on several smaller outboards is the chip.
Last edited by cmontgomery; 02/23/25 10:04 AM.
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Re: Outboards specifications
[Re: cmontgomery]
#4290647
02/23/25 10:11 AM
02/23/25 10:11 AM
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Joined: Feb 2011
Posts: 11,292
Conecuh county
hallb
Booner
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Booner
Joined: Feb 2011
Posts: 11,292
Conecuh county
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Computer chips probably. Only difference on several smaller outboards is the chip. Yep. My understanding is it's the same exact motor, just tuned differently. They do this in the smaller sizes as well.
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Re: Outboards specifications
[Re: DryFire]
#4290772
02/23/25 01:58 PM
02/23/25 01:58 PM
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Joined: Oct 2004
Posts: 6,902
Hoover (poor section)
Johnal3
it froze over
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it froze over
Joined: Oct 2004
Posts: 6,902
Hoover (poor section)
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The only difference is between my Yamaha 150 and a Yamaha 250 is a computer chip. All other parts are the same. I’m not saying you are wrong….its highly likely you know more than I do, but wouldn’t the injectors have to be bigger? Seems it’d have to have more air also? Same motor, but with some slightly different parts? 100hp is a huge jump! Just my thought. I’ve got a 2 stroke 40 Yamaha. I was told just changing out the carb could make it a 50 or 60. Then a carb and exhaust manifold?? (maybe that was the part) I could have a 70. They were the same motors though.
This is Aldeer! The place people come to vent their frustrations and completely change their stance a few minutes later... 
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Re: Outboards specifications
[Re: DryFire]
#4290776
02/23/25 02:09 PM
02/23/25 02:09 PM
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Joined: Jul 2020
Posts: 249
Northport
Mansfield
4 point
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4 point
Joined: Jul 2020
Posts: 249
Northport
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The only difference is between my Yamaha 150 and a Yamaha 250 is a computer chip. All other parts are the same. Not correct 200-300 are the same your 150 could be tuned to a 175.
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Re: Outboards specifications
[Re: Mansfield]
#4290777
02/23/25 02:09 PM
02/23/25 02:09 PM
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Joined: Feb 2011
Posts: 11,292
Conecuh county
hallb
Booner
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Booner
Joined: Feb 2011
Posts: 11,292
Conecuh county
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The only difference is between my Yamaha 150 and a Yamaha 250 is a computer chip. All other parts are the same. Not correct 200-300 are the same your 150 could be tuned to a 175. That's right, 150 and 175 are same. It's all about you paying for the horsepower.
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