RS125 problems.. again!

[Wiltie]

Hello, in a matter of days my motorcycle has gone down the shitter

When I was driving to work a few days ago my rev limiter started flickering about all over the place and was at times wasn't responding to anything (staying at 0rpm) whilst I was driving, after a few minutes my bike completely cut out. It wouldn't start up at all so I bump started it, had a complete loss of power and everytime I come to a stop it cut out even with my clutch held in.

I got it to work (just about) and it wouldn't start at all after that, so I changed the battery for a new one as it was losing power when put under pressure and it started to work fine.

Then... To add to the fun it happened again whilst I was at my mates house yet this time when I throttle it hardly responds to it. Bearing in mind my powervavlve jammed shut literally two days before all of this.

Any suggestions to what my problem is? I realise my carb is probably a bit blocked to start with, could my powervalve being jammed shut cause this? Any help will be appreciated. Thank you.

[bikersupermot...]

dont be adjusting any carb settings if the bike was originally running ok.

1st thing - new plug set to the correct gap. check / clean the air filter.

make sure battery is given a full charge and see how you get on with that to start with.

come back and let us know how u get on
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tinybikes

[_Iain_]

Sounds like the winter weathers cabbaged the electrics causing the plug to foul. Either way theres an intermittent electrical fault.
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Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340

[Wiltie]

Oh, so it'd be the spark plug needs changing? I didn't think it could be a possibility I was looking more technical, I assumed my carb was blocked.

Okay, cheers I haven't got time on my hands until Saturday so I'll let you know.

[Wiltie]

I have an idea. Do you not think it could be a fault with the generator? I don't think my battery is charging itself?

[P.]

[Minty]

Check the choke is disengaging fully too. Had an issue on my NSR where it would bog down if I didn't keep it throttled. Turned out the cable was sticking and remaining permanently on.
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My fingers smell of your mum.

[Kickstart]

Hi

So the bike ran increasingly badly until you changed the battery which fixed it for a while then it degraded again.

Sounds like the battery isn't charging (and I think a decently charging circuit is required on a later RS125). Stick a voltmeter over the battery. Should be ~12.5V with the ignition off, ~13.5V with the engine idling and ~14.5V with the engine being revved.

If you don't get readings like that then most likely the problem will be the regulator / rectifier, or the wiring to it.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[_Iain_]