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Old 30-11-2020, 10:43   #1
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Join Date: Aug 2020
Location: Ontario Canada
Boat: Island Packet 31
Posts: 1
Kanzaki KMP2 vs KMP3

Hello all
I am in the process of repowering an Island Packet 31 with a newer Yanmar 3gm30f. The newer engine has a Kanzaki KMP2 gearbox 2.61 gear ratio, the engine Im replacing had a Kanzaki KMP3 2.62 gear ratio. The KMP2 gear box is .5 inch shorter so I will need to have a new shaft made up.
My question is; are there any other essential differences between the 2 gearboxes? Is the KMP3 heavier duty? I notice the KMP2 is mostly on the Yanmar 2GM engines.
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Old 30-11-2020, 21:53   #2
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Join Date: Sep 2014
Location: Auckland, NZ
Boat: Compass 790 , 7.9 metres or 26 ft
Posts: 2,046
Re: Kanzaki KMP2 vs KMP3

Sorry I cant answer your question I'm asking one lol.
I'm assuming the KMP3 can bolt up to the newer engine so can't you use the previous g/box?. Trust its not knackered, the g/box on our old ysm8 is bulletproof, way over-engineered IMO but I'm not an engineer, just comparing its gearbox to motorcycles from my youth it appears to be huge.
Following with interest.
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Old 01-12-2020, 01:43   #3
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Join Date: Jan 2013
Location: Kimberton,Pa.
Boat: Cabo Rico 34
Posts: 626
Re: Kanzaki KMP2 vs KMP3
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