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Old 06 June 2016, 08:35   #1
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Engine won't start

We have a 40hp 2 stroke Yamaha that won't start, electrics seem to work OK(tilt trim working with no issues) but everytime we turn the key all we hear is a click and the battery terminal starts to smoke. It was a new battery after a full service 5 weeks ago, am going to look at taking it back to the garage but was wondering if anyone had any ideas as to what may be causing the issue?
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Old 06 June 2016, 08:51   #2
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sounds like your battery clamp is loose and or excessively corroded cable going into the clamp.
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Old 06 June 2016, 09:55   #3
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I thought that originally, cleaned the terminals and clamps and RE attached, same problem occurring - is it worth trying an alternative battery, is it possible this one is a dud even though it's working the tilt/trim?
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Old 06 June 2016, 10:08   #4
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Unlikely ( but not impossible) it's a duff battery if it's smoking the terminal.Thats telling you there is a high resistance either a duff starter drawing too much power or the battery terminals are still not clean enough. Give them a good rub with rough paper (40 or 60 grit or a file) and try again. Once a battery terminal has arked and burned the faces it can be difficult to get a good clean surface for the connection
Then maybe try the starter direct with a pair of jump leads from another battery if it spins free then the problem is with wireing/battery
It's just a process of elimination, if you have a good battery handy it won't hurt to try it to eliminate it
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Old 06 June 2016, 14:23   #5
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Fixed the same thing on mine yesterday by replacing the battery connectors with new ones.

The old connectors were really skanky, so it was an obvious thing to try, but the symptoms were the same as yours.
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Old 06 June 2016, 16:31   #6
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Sounds more like your starter is pulling too much current and causing the battery to smoke. Check the starter motor spins ok. I doubt a duff battery would have enough juice to cause the terminals to smoke.
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