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Old 23 August 2016, 14:30   #1
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difference between honda bf75/90

heres a bit of a question for tonight what is the difference between hondas bf75d and 90d engines i have had a look at both their specs and they are identical in every way but that doesn't tell me why their outputs are different so is it camshafts head design rev limit or what
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Old 24 August 2016, 10:19   #2
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Can I be the first to say "15"?

I think (I am not at all sure of this) that the ignition/injection map is different. Done to fill the hp niche for different power levels.

jky
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Old 24 August 2016, 13:25   #3
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I was told that a yam 13 hp was made for a certain market and the Rev limiting screw was adjusted to make it a 15 hp again. I would guess the CDI would be different as said, I know the Suzukis in the 90 hp range I think 80,90,100 1500 cc are the same engine so tuned to increase hp.from the manufacturers point of view easy to make the same engine with slight changes to gain 10 hp I suppose?
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Old 24 August 2016, 14:43   #4
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spoke to the dealer today and he reckoned that it was ecu and injectors so it sounds cost prohibitive
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Old 25 August 2016, 02:01   #5
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what kind of dosh they talking out of interest
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Old 25 August 2016, 03:24   #6
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2k approx for ecu and 300 each for injectors
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Old 25 August 2016, 04:30   #7
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Honda 80 7935 100 8165 new Ron hale marine prices thats getting well up toward those prices for the bits
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Old 25 August 2016, 06:05   #8
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yes i know thats why i am thinking sell the old boat with engine complete and fit new engine onto new boat with the cash from the sale
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Old 29 August 2016, 10:18   #9
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I have a year 2010 BF90. The manual, which covers the BF75 too, says the 75 is a standard OHC engine, while the 90 is OHC VTEC. I was told that until you get beyond 4.500 rpm, there is little difference between them in torque/power.
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Old 29 August 2016, 10:48   #10
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Quote:
Originally Posted by alystra View Post
I have a year 2010 BF90. The manual, which covers the BF75 too, says the 75 is a standard OHC engine, while the 90 is OHC VTEC. I was told that until you get beyond 4.500 rpm, there is little difference between them in torque/power.
how do you find the 90 on your humber what length is it
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