Engine cutting out at lights and refuses to start!

[acarroll9]

Engine cuts out when coming to a full stop at traffic lights and then electrics suddenly refuse to work!!
Recently bought a Keeway Superlight 125, A seemingly amazing little learner legal bike! bought from a private seller and everything seemed perfectly fine when I bought it. While riding around I've noticed that the engine often cuts out If I've been coasting for awhile. It seemed innocent at first, The bike doesn't idle too well. But now the bike has started to refuse to start. The lights still work but the neutral light won't light up and the starter motor doesn't turn. In fact the neutral light dims and flickers while the engine starts. I thought that It was just because after stalling and the starter motor being used quite often the battery had been drained but actually red 12.75v on a volt meter. I adjusted the carb to be slightly richer as all signs pointed to the engine running kind of lean. and I've noticed that every day I ride it the electrical issues get worse and worse. When this happens if I leave the bike for a little bit, The neutral light will come back on and then the bike will start and run perfectly until coming to a full stop at traffic lights I'm not too familiar with motorbikes engines and electronics but that's pretty much everything I have noticed while riding. Can anybody help? Has anyone had any similar issues? Thanks!!
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A CARROLL

[jaffa90]

Wow, what`s the voltage reading when pressing the starter button using the bike frame for earth / negative?

[WD Forte]

It could be just poor electrical connections but its difficult
to diagnose these things remotely.
I'd open, check and clean all connectors first, checking for corrosion and bad contacts.
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bikers smell of wee

[acarroll9]

Have no idea, I don't have access to a VU meter right now but what should I be looking out for while trying that? and I've just taken the seat off, no sign of corrosion or bad connections under that, Still have yet to take off the side panels or even the tank. My worry is that it has quite a large petrol tank that could hide a multitude of sins! Thanks for the reply's, Ill get back as soon as possible with the results!
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A CARROLL

[acarroll9]

I've noticed that the neutral light gets considerably dimmer with the lights on and I had the most problems at night with my lights on, I'm not sure if I've mentioned but the RPM also dips considerably with the lights on, is this normal?
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A CARROLL

[WD Forte]

No
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bikers smell of wee

[acarroll9]

what would this suggest? a new battery is needed? Its just that the battery is only a year old
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A CARROLL

[Ariel Badger]

Have you tried a charger on the battery? Sounds like it is dead though.
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Bikers make great organ donors, get 115 on your licence today.

[doggone]

First thing to consider if not just needing charging is bad earth - black wire from battery to frame.
This takes a lot of load and they can be prone to corrosion which makes for a range of intermittent/baffling problems when the voltage getting through is inadequate.
A simple test is borrow jump leads and attach one to negative terminal and a bright part of frame.
If some or all problems go away or changes, the original connection needs improving.