Cb450 headlight mounty full#

The longer the points are closed the more energy will be pumped into the coils.Īctually, as Watts go up, if the Voltage remains constant, the current must go up while resistance goes down: V = I * R and W = I * V = ( V/R ) * V = (V*V) /R (I is the standard symbol for Amperes in the formulae). One thing many don't realize is the dwell period the points (or electronic ignition) are closed will affect the amount of energy required for the electrical system. Things like swapping over to LED lights and going to the high energy ignition coils will affect the total load on the electrical system. By the time your '82 Nightwawk was built, advances in semiconductors allowed for better voltage control and a more robust charging system. This really applies to the earlier bikes. If there is not enough load then the battery will be over charged and boil off the electrolyte. If there is too much load then the battery will not charge. It is a tight balancing act to modify the electrical system. It will let me know if there is a charging problem. I really like having an on-board volt meter.

If it goes below 12.7 volts then you know you are running on the battery. In this circuit the amps stayed the same, the resistance (Ohms) increased then Ohm says the voltage must go down. Increasing the wattage rating on the headlight increases the total resistance in the bike's electrical system. On our bikes the total energy is fixed by the stator in the alternator and the speed the engine is turning. Watts is an expression of the total energy. Ohm's law says Volts = Amps X Resistance (Ohms). The voltage with old bulb installed and on low beam was 13.7 volts at idle and it would jump up to 14.1 above idle. The old H4 bulb was rated at 45/45 watts, but I measured it and it was actually 45/50 watts. I think the video frame timing makes it worse. The electronic tach doesn't bounce around as much as the video shows. It goes across the top two handlebar clamp bolts. I intend to ride it over the winter and will report the charging performance back to the forum. With the headlight on it goes below 12.7 and will drain the battery. This video shows my 450 running and the voltage readings. The current increases with the speed the engine turns it. Honda twins have what is known as fixed output alternators. Modern voltage regulators will cut off the voltage at 13.7 volts, however under certain conditions the voltage can go higher. When the voltage is above 12.7 volts the battery is being charged. When the voltage measures less than 12.7 volts the battery is being drained. To charge the battery, the electrical system voltage must measure more than 12.7. A fully discharged battery will measure 12 volts or less. A fully charged battery will measure 12.7 volts. A voltmeter allows the health of the charging system to be monitored. I had a 55/60 watt H4 in the garage so I installed it.

After I finished the day's work on the GL1100 restoration.

Cb450 headlight mounty full#

I've always thought this bike could run a full legal 55/60 H4 headlight. The low beam went out over the summer and I just ran it on the high beam. I took the 450 out for a ride today and discovered the high beam filament burn out.