Electric start suddenly wont work?

jtclark93 · L Plate Warrior Joined: 21 May 2015 Karma :

I have a Honda NSR 125 RX 2001

So far everything has been going well in getting it into good condition, managed to use it daily for a month or so (Bought about 2 months ago)
Tonight as i wanted to ride home, tried to start, electric start would not have it, Had to bump start it.

When i turn the key, loights come on as usual and everything, when i press the start button theres a click, then nothing.

Bumps and doesnt lose power.

Any ideas anyone?

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

probably either the battery or starter relay is shagged.
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Teflon-Mike · tl;dr Joined: 01 Jun 2010 Karma :

I seem to recall that there's a common issue with the starter clutch on these; think the starter mech engages the crank on the same side/gears as the water pump, and when a seal goes, they gum up, or something of that ilk that may be worth chasing better info on.
however, usual suspects are, the battery; starter is the single highest load device in the electrical system & can flatten a good fully charged new battery in about ten minutes. A tired battery wont have the charge in it to power the starter; might have the volts, but not the amps in it; even if it'll light up lights and stuff, and course, once engine running, devices get power from generator, not battery. Solenoid; personally I think they are blamed far more than is true; but yours clicks, so must be actuating, but that just throws contact accross two terminals; they may be shitted up and not conducting.. some older honda solenoids are quite 'nice' screwed together and have a thick brass contact plate you can get at and sand/file to get good contact back... however.. if the plate is black and pitted, often a sign that its actually the starter motor that's the main problem, drawing a higher current than it should; two causes; first is crapped up contacts inside. There's two carbon brushes that run on a ring of brass contacts; as the carbon wears they fill with dust, and the contacts start start going shitty, meanwhile the bushes and reduction gear get a bit sticky, so you get a higher drag on the thing making it draw more current, and that thins the braid contact leads to the brushes... AND you have the potential for that sticky gummed or jammed starter clutch....
Start at the battery, and work down stream to the starter, pulling stuff apart, cleaning and lubing... if you strip the starter, fit new brushes, they ought be about £10 from DSS.
Of course... could be something as simple as a bad earth on the battery or between engine and frame/battery....
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bugeye_bob · World Chat Champion Joined: 05 Sep 2013 Karma :

Would he not be better getting the battery checked before the op gets too carried away ?

jtclark93 · L Plate Warrior Joined: 21 May 2015 Karma :

I've followed the wiring and found that there's a wire leading from the ignition switch that looks to be burnt out, could this be the culprit?

Taught2BCauti... · World Chat Champion Joined: 12 Jan 2012 Karma :

Looks like it might have something to do with it, but it is likely that a fault with the starter motor or solenoid has caused the wire to burn like that, rather than the burnt wire has caused the fault.

Is that the wire that goes to the starter solenoid?

You need to check that you are getting a voltage reading on the starter solenoid when you press the start button (one of the smaller terminals), then check that the starter solenoid is working properly, and that when it does, you get volts at the starter motor.

The starter normally earths itself through the engine, so check you have a good earth between engine, battery and frame.

Find the fault before repairing the burnt wire, and/or the connector block.
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Aceslock · Spanner Monkey Joined: 12 Dec 2014 Karma :

I had a similar issue with my Thundercat when i first had it. Went out for a ride, stopped at a scenic location for some pics, jumped back on and ......... nothing! just the clicking sound, managed to bump it & rode 35 odd miles home to investigate.....

The only thing i found was the battery terminals were not tight enough (have had the same issue on a car previously) so that the starter is not getting enough voltage. Haven't had an issue since Very Happy

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jtclark93 · L Plate Warrior Joined: 21 May 2015 Karma :

I found the probLem, is this the CDI unit?

Whatever it is it had fallen onto the chain somehow, what prt is it so I can replace?

jeddy11 · Traffic Copper Joined: 06 Jul 2012 Karma :

That looks like a relay..

And is probably the reason its not working on a good note there pretty cheap..

maybe https://www.motorcycleproducts.co.uk/starter-relay-honda-nsr125-2001-p-282945.html
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Teflon-Mike · tl;dr Joined: 01 Jun 2010 Karma :