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I've wondered that myself, but certain "gurus" on this site set me straight, so in their honor I'll try to pass it along; the headlights (and every other light on the scooter) is actually running on DC power . . . it's just "rectified" DC power. The stators on these scooters are designed to create AC power. This is routed to the Regulator/Rectifier (the small ribbed component on your wiring harness somewhere), where it is converted to DC power and dispersed to the other areas of the scooter. The "regulator" component insures that the DC power it releases DOESN'T (or shouldn't) fry the other parts. The leftover DC power it converts runs back to your battery to recharge it. I had a similar problem on my scoot, and it ended up being a bad Regulator/Rectifier!

P.S.- I assume I'll be corrected if my explanation isn't OEM!

Does anyone out there happen to know which camshaft is stock on a factory GY6 150cc (A8, A10, etc.)?

I've had success in the past by using a couple of solid wire "jumpers" placed in the plug for the bad switch going to a toggle switch for a temporary fix . . . worked fine for me!

I've got a 157QMJ long case, and the stock tire was a 130/60-13. I now run a Shinko 140/60-13 in the rear and a Shinko 120/70-13 in front (matching set, which I HIGHLY recommend). After over a year of DAILY riding, they still have plenty of tread, and I don't see myself ever buying anything else! Hope this helps.

Going to work last week, I came off of the highway (55-60 MPH for about 3 miles) and stopped at the service road light. When the light changed I noticed a severe drop in power (not as much on take-off, but 10 kph to 40 kph takes FOREVER)! It made me think I was back on my 50cc! Rode it home for lunch (no highway, obviously) and back to work, no change. On the way home after work, it suddenly regained power . . . while in motion! Needless to say I couldn't troubleshoot it when it's working.

This week I noticed a slight power drop occasionally when leaving a stoplight, but just for a fraction of a second, then it would accelerate normally. Now it's back! I thought it might be a clogged muffler (that's kind of what it felt like when it "freed" itself up) so I took off the muffler and ran it with just the pipe . . . no change. I've also tried cleaning the air filter, checked for vacuum leaks (lines and intake), changed the gas tank vent line (read that somewhere), and checked the valve lashes . . . all checked out normal. A neighbor suggested maybe a burnt valve, but wouldn't that affect the performance consistently instead of being sporatic?

I'm going to check and clean the carb today (inspect the jets, slide, etc.), but would be open to any other suggestions!

Yes, the AutoZone closest to me sux, always busy and they make you stand in the parts/service line even if you're just checking out . . . NEVER AGAIN!  Thank you to all of you genius guru's, you were ALL correct . . . battery bad under load! Bought a new one at Batteries Plus (10AH and 170 CCA's instead of 90). I'll have to make a small mod on my battery box to fit it (3/8 inch taller), but well worth the work. The scoot starts easily every time, first crank.

As for the other issues, they seem to have been solved . . . except one. Key on, kill switch off, when I grip EITHER brake, the instrument lights come on! Strange, since I'm pretty sure they don't share ANY wiring.  I've been studying the wiring diagrams for a while now but can't seem to find any common connections that explain it. Has anyone heard of this before? I can't even reason where to look for a short!