I'm having a headlight problem on my Honda 125cc bike. My problem is that I don't have a battery on my bike and every time I connect a bulb, it blows up within 5 mins. As of this moment I can't afford a battery. I know the bulb is directly connected but I want to know that there is some way I can fix this issue. My mechanic said he'd try maintaining the current, but he blew up the taillight as well. How can I maintain the current?
The voltage regulators on honda bikes are not well built . When you have a battery attached, it gets charged causing a voltage drop. Without it, high uncontrolled power flows through. There is a simple fix, if only the lights are the problem. You can attach voltage regulators on the line the headlight and tail light are attached. They are easy to install. But first check your voltage . For 6v use 7806 For 12v use 7812 The following circuit is commonly used :
I had a 70cc honda scooter that did the same thing. The voltage regulators on some of their bikes were pretty screwy... the lower the battery voltage, the higher the output voltage from the gen. I measured mine one time without a battery at over 20 volts output!
The only solution is to get a battery, or try to find a more appropriate voltage regulator. When I looked I never found any off the shelf that I could just bolt on, and I was going to make one, but then I sold it.
If you get a battery make sure to maintain the voltage with a charger when not riding it for a long time.