Bike Talk motorcycle forum

I have a 1977 Sportster, exhibiting the following problem. With the engine off, the headlight will come on, bright, with the key switch in the ignition on- light on position. With the engine running, and the key in the ignition on-light on position, the headlight is extremely dim at idle, and goes out as rpm is increased. The following checks have been performed:
Generator output - at idle - 8 - 9 volts, rising with rpm. Brushes and commutator cleaned.
The speedo light is connected to the same terminal on the switch, but is unaffected.
bosch style mechanical regulator in use. (new)
12v present at headlight plug for both low and high beam (running engine)

Rino

Anybody on? I am having trouble getting my 91 Heritage started. I put in new plugs and it appears to be sparking. There is not any trash in the line because I see gas coming through the carb needle. Could it be an ignition module or cam sensor when the plugs are firing or is it starving for gas?
Help me out. Thanks, chief

I have heard so much about oil for the motor and honestly I am confused. Should I use Harley motor iol or should I get a good synthetic oil for an auotomobile.
Thanks

Help! Any suggestions.

Keith

I've got gas in the oil! I'm taking it in for the 10,000 mile tune up. Anyone had the same problem with the fuel injected 2003 Fatboy?

Thanks