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Old 04 June 2010, 05:16   #1
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Yamaha 55AE gear ratio

Hi,

I am in the process of "revitalizing" a 1979 Yamaha 55hp 2stroke (duh) outboard engine. I have bought a service manual that covers alla yamaha motors built from 1984-onwards but i cannot seem to find and info regarding the gear ratio.

I would need that info to determine the right propeller size for this moter. The boat i intend to use it is a 3.85m speed boat. Photos can be found
here: http://blog.locus-delicti.com/wp-con...5420370851.jpg

and here: http://blog.locus-delicti.com

Regards
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Old 04 June 2010, 11:33   #2
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You don't really need to know the gear ratio; select the prop based on WOT rpm, and fine tune by other characteristics if necessary (hole shot, aeration in turns, etc.)

jky
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Old 05 June 2010, 12:27   #3
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about 15" pitch would be a good place to start on that!
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Old 15 June 2010, 07:55   #4
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I will install a rpm meter the coming weekend and check the WOT rpm...i will post my findings for your valuable advice.

Till then, i have another question. The kill switch doesn't seem to function. The engine is able to start and operate without the kill switch attached. Where should i look to fix this issue?

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