Posted April 28, 201410 yr i'm running a 2010 yamaha ybr 125 on L plates. i've got my test next week so i'm wanting to practice my skills. typically, it's decided to stop working! at first, i turn the key to 'on' and the lights would come on but it wouldn't fire up when i pressed the ignition button. the more times i tied it, the weaker the lights got until the point where no lights came on at all i took the battery off and stuck it on charge, but the charging unit said it was 'max'. so i used a multimeter to check the resting voltage, which was over 13v (which i believe is ok?) so i don't think the battery's at fault. i've checked the blue fuse that's connected to the positive cable and that appears to be fine..... so i'm kinda stuck what to look at next??? one thing i did notice was when i hooked up the battery to the bike to try it again, when i turned the key to 'on' i heard a strange crackling sort of sound (kind of like sparks of electricity), but then it went quiet again and the lights worked for a short while but the engine still wouldn't start. then the lights faded out again any ideas? thanks
April 28, 201410 yr Moderator Got a car in the family? Get some jump leads and connect your bike to it. It wont hurt the car battery and then start the bike. Sounds like a bad cell in the battery. It will still give 13v but the bad cell will have no power.
April 28, 201410 yr Author i don't have any jump leads, but i have got one of those battery booster things. i'll give that a try. thank you for your quick response
April 28, 201410 yr Moderator That should do to prove the battery. If it starts straight up, easy fix.
April 28, 201410 yr Author just to let you know, when i checked the voltage again whilst the battery was back on the bike, it was just under 13v and when i turned the key to 'on' it dropped to under 5v! so i've ordered a new one thanks
April 29, 201410 yr Late reply i know, but i had the same thing with my bike. its definatly a dead cell in the battery and a new one is needed (just like you have done )
April 30, 201410 yr It may be worth noting that car battey chargers and boosters are not designed for 12v motorbike batteries.
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