My jetmoto 125 charging system does not seem to be right.When it is idling the voltage at the battery is 12.6v, when the headlights are on the voltage drops to 11.4v. After running it with the headlight on for awhile it will not restart. I have put a new battery in it and repaired a broken wire at the voltage regulator. Any ideas would be helpful.

not sure but I bet you'll have less problems if you replace with a aftermarket battery, I haven't done it yet but it seems to help others.

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2007 Roketa RTK-250W / ATV-09 (Tomahawk)
2007 Lance / ShineRay Mini Talon 110cc (Camo-pink)
1996 Jeep Grand Cherokee V8
2005 Pontiac G6 GT
1983 CJ7 Laredo

I am having the same problem myself 89stp. I thought mine was the battery so I swapped it with my 150's battery. After a hour of riding, the 150 starts and the 125 doesnt. I was going to look at mine this weekend and will let you know what I figure out.

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07 Jetmoto 250 Sport
07 90cc Mini Ute
06 Jetmoto 200 Enduro
06 Jetmoto 200
06 Jetmoto 150
06 Jetmoto 125
04 Yamoto 150
01 KTM 400 EXC
92 WR 250
91 CR 250
88 YZ 80
85 CR 500
83 XL 600
82 XR 200
79 XR 75
79 Odyssey
73 Bultaco 360
71 Rickman Montessa 250
70 Rupp Enduro
69 Honda 50

I have replaced the battery, it has an Energizer in it now. I am going to try to look at mine this weekend also. I will let you know if I find anything.

Hopefully between the 2 of us we can figure this out. Thanks for the info in the pm, I have not looked at anything on mine yet. I was going to start by making sure everything was connected tight and that the ground(s) are good.

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07 Jetmoto 250 Sport
07 90cc Mini Ute
06 Jetmoto 200 Enduro
06 Jetmoto 200
06 Jetmoto 150
06 Jetmoto 125
04 Yamoto 150
01 KTM 400 EXC
92 WR 250
91 CR 250
88 YZ 80
85 CR 500
83 XL 600
82 XR 200
79 XR 75
79 Odyssey
73 Bultaco 360
71 Rickman Montessa 250
70 Rupp Enduro
69 Honda 50

I forgot to bring my tools home to test mine, but I think that I will still replace rest of the connectors on the voltage regulator and check connections and grounds. With out testing much I am leaning to a bad voltage regulator.