Jinlun 125cc scooter

Hi Kat,
My guess (as an electrician specialising in 12v electrical systems) is that the machine is no longer charging the battery for some reason.

A couple of checks:
Connect a fully charged battery, but instead of connecting the earth (negative) side of the battery to the earth wire, connect an ammeter BETWEEN the battery negative and the earth wire, with everything switched off. There should be no current flowing. If there IS a significant current flowing, you have a wiring fault.

With the fully charged battery connected normally, and the scooter on its centre stand, put a digital voltmeter across the terminals of the battery. Record the voltage, which should be between 12 and 13.5volts. Start the engine, preferably with the kickstart rather than the electric starter. Gently rev the engine with all the lights turned off. (be careful that the machine stays on th centre stand and doesn't shoot forward!) The voltage should rise steadily to about 13.8volts. If it shows no sign of rising but steadily falls (especially when you turn the lights on) you have a fault with the charging system, which is either a failed alternator, blown rectifier or a wiring fault. I don't know if the machine has a fuse to protect the alternator - I doubt it.

Hope that helps.

John

My bike is a year old come the end of oct i started to ride from Jan of this year and my battery keeps going flat im on my 3rd battery now and am getting stressed out!!
Ive charged the battery but as it goes on the bike its like some one has pressed dump power and the power just goes but if i push start the bike and run it for a while it will hold the charge for a few min but it goes again after i power the bike down!
What could it be help
K@

Hi Kat again im having my worst life ever withthis bike the back wheel sprocket or cog all five bolts snapped so im pissed now where do i get replacement back wheel or bolts for the cog.  As its from china the metal on these are brittle and weak! help me! 

Try JinLun-NorthEast.co.uk