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Old 13 February 2012, 09:04   #1
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Country: UK - England
Town: Devon
Make: AVON SUPER SPORT 3.4
Length: 3m +
Engine: YAM 25, YAM 30
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Yamaha 30 hp
Can anyone tell me if the Yamaha outboard 30 hp is positive or negative earth please? Also which battery would suit this motor? Thanks.
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Old 13 February 2012, 09:44   #2
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Country: UK - England
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Boat name: SMH Rib / War Shot
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Length: 4m +
Engine: 100hp Yam/150hp opt
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Negative earth.

We fitted the smallest 12V battery I could find at our local battery suppliers - some thing like 30Ah iirc
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Old 13 February 2012, 10:36   #3
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Country: UK - Scotland
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I've got a 40 odd A-H one powering my 60Hp......

Once it's spinning it's self sustaining, so you don't need a huge battery to keep it alive. (especially as you can pull start it!) If you have a ton of electrionics on board there may be an argument for a bigger one....
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