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Hello, Im new to biking and this website and I'm having a few problems with my recently purchase 2009 XT125R. It always had problems starting by electric start and sometimes needed kicking over. However the battery will not charge and is permanently dead, I get the dash and lights when the engine is running, but occasionally I do loose it for a few milliseconds. I have used a voltmeter and the battery is around 10v when the engine is not running and struggling to push 12v when running. when I rev I don't seem to get any more voltage so believe its not charging at all. I have recently changed the front bulb to halogen bulb as the standard one is not capable of seeing anything without street lights, im not sure if this is having an effect, however it was always a problem before I changed this. help..........please Thanks

Hiya guyz, Been offline for a while was tied down with work...so hope all the guyz doing well.. Would you guys tell me how would you identify faulty plug caps with a multimeter or any other means? My engine's got a lazy start, a heavy misfiring going on in front cylinder..like it fut futs doing well at lower gears. However you can still ride, the issue starts to appear right after you slower the bike in order to turn or at a zebra crossing. I have to accelerate greater than usual in order to make her move right after some stop. I checked spark plugs and the front cylinder had sooty black carbon build-up but the sparking points were clean at the gap, carbon build-up was around 20% which I think is normal? The rear cylinder had no carbon at all and the combustion seems to be good. Both spark plugs are new and genuine NGK made for Yamaha. I saw on the net there is a resistor in plug caps, may be its damaged, I tried to check continuity in caps but no reading came out in multimeter. Is it possible misfiring to come with bad plug caps? The misfiring comes all the time right after washing the bike or riding in the rain. In that case also engine starts to fut fut at low gears but sometimes at the 1st when I accelerate more the bike moves speedily. May be faulty ignition coils? How can I check them with multimeter? There is a sudden brightness increase in the headlight also, it comes on and off, sometimes the brightness remains for several minutes and reduces... Does my bike having a serious issue, have you guys come across the same? can oxide buildup in plug caps or something cause this? Faulty rectifier? or battery? Please help me..thanks guyz!

First just thought I'd say hi since this is my first post. Have been lurking around reading for a while but haven't posted yet, so hi everyone! 27yr old first time biker as of three or four months ago. I've got a YBR 125 custom 2009. Bought it second hand and luckily it did actually run . Everything seemed fine for the first few months. I then had a minor fall in some torrential rain which resulted in some expensive repairs (and lessons very much learnt!) but it's been running fine since. Then last week, it just failed to start... Turning the ignition would give anything between no power at all, to everything coming on (lights, dash, engine warning light turns on then off). But, on occasions where it appears to start, starting the engine with the electric start kills all power instantly. The starter appears to 'click' but power goes dead straight after. Interestingly, pulling the front brake has the same effect, so I imagine its that any drain on the battery (starting engine or turning on brake light) kills it. The dash lights would actually fade on/off sometimes when trying to start or wiggling the steering which makes me suspicious its a dodgy wore somewhere. If the neutral light does come on, it will start fine with the kickstart (luckily, since I had to drive it 4 miles home after the first time it stopped). The battery is theoretically 2 years old, though who knows in reality. I've got a haynes manual so have done a bit of testing following that: voltage across the battery seems fine (a little over 13v). battery doesn't look damaged. cleaned of a little bit of corrosion on the positive terminal. took the front light off and tested voltage to the ignition via starter motor which seems fine. tested continuity through ignition switch, no resistance. checked continuity in battery neg to earth/frame wire and that seems good. Any tips on what to do/check next greatly appreciated! I can't find any info on actually checking current from the battery. Im no mechanic or electrician, but I imagine it can hold charge and still not be supplying sufficient current... I think I ought to just get the battery properly tested (and maybe replaced)... any recommendations where to do this (cheaply!) in London, UK? Cheers in advance, I'm itching to get back on the road!