[HondaNAM400ex]

Hi guys,

So I've run into a bit of a problem, old battery kept dying on me. Bought a new one and after a dune trip had some problems starting it, when it eventually started I rode for a while and when a stopped it wouldn't start again.

Just wondering whether something could be wrong because I've fully charged the battery and when the bike idles the voltage reads around 13.9- 14.

I want to have the new battery tested today, hopefully this one isn't buggered as well.

Any hints as to what this may be?

 

[b52bombardier1]

Do you own a good multimeter?

Rick

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[b52bombardier1]

With a good quality multimeter, and the bike running at half throttle, tell us what you see for AC volts at the battery.

Rick

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[HondaNAM400ex]

Will give it a go as soon as I get the battery back from the shop.

 

[HondaNAM400ex]

What values am I expecting to see when I give this a go?

 

[b52bombardier1]

At half throttle using a good quality twenty five dollar - ish multimeter, expect less than .1 volts AC - a tiny amount. Less than a tenth of a volt AC. Cheap meters of the free or five dollar variety at Harbor Freight struggle with taking accurate AC measurements. If in doubt, run these tests with the engine running on a modern automobile battery to see how well your meter functions.

Hope to see around 14.5 volts DC on a fully charged and healthy battery.

Anything much different than this indicates problems with the regulator / rectifier or possibly the stator.

Has your bike ever been ran without a battery?

Rick

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[HondaNAM400ex]

Thanks, that's what I expected the values should be. I have a decent multi-meter that should be accurate enough. Will keep you posted as soon as I've got the tests done.

Nope, I've never ran it without a battery have had it jump started off a car battery and driven it around in the hopes of getting the battery charged a bit but failed miserably. I remember trying this with my old 400ex which worked fine after a quick 15-20min ride.