Vintage Dirt Bike Q & A

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PostPosted: Wed Aug 03, 2016 7:01 pm 
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Joined: Mon Jun 01, 2015 6:29 am
Posts: 34
Location: Burlington NC
I do not have headlight,tail light,Gauge lights,neutral light or horn. I do have turn signals and brake lights.
New Battery
Tested the stator via manual and tested good
Changed out rectifier with spares and also checked as per manual.
Checked all grounds
Checked that I was getting 6 volts to the wires in the head light
Swapped out light swithches

I did have high beam light only for a bit with the bike running and being revved up

I understand that I should at least have gauge,tail lights and horn off of battery.

Any ideas???

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73 Honda CR250m
74 Honda CR250m
75 Honda CR250m1
76 Honda CR250m1
80 Honda CR250R
79 Yamaha YZ250F
79 Yamaha YZ400F
74 Yamaha GTMX80
75 Honda MT250 x3
66 Honda CA77 305 Dream x2
67 Honda CB77 305 Super Hawk
2009 Yamaha YZ250 2-smoker
2008 Honda CRF150RB


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PostPosted: Fri Aug 05, 2016 6:51 am 
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Joined: Fri May 29, 2015 7:34 pm
Posts: 34
Hello,
did you ohms test the bulbs themselves?
EVERY bulb on mine was buggered when I got it.
Horns are cheaply made and can get corroded enough inside to seize up the mechanism.
With the engine off and key switch and light switch on, all of the lights should work with the exception of the headlight; it's powered by a coil.
A good, healthy battery is crucial to a 6v system.


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PostPosted: Fri Aug 05, 2016 12:47 pm 
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Joined: Mon Jun 01, 2015 6:29 am
Posts: 34
Location: Burlington NC
I had all new bulbs and the horn was working on a weak battery, I started the bike and it blew all the bulbs and messed up the horn.
I have just installed a new battery but the horn is still not working.
My stator is only putting out 4.45 volts on the yellow and the pink wire.
The rectifier tested good I think I had two diodes test around 5.55 both ways and one test 10.33 both ways. (I actually have two other spares and they tested the same way)

Someone said that a dead battery will sometimes cause the bulbs to blow ???

_________________
73 Honda CR250m
74 Honda CR250m
75 Honda CR250m1
76 Honda CR250m1
80 Honda CR250R
79 Yamaha YZ250F
79 Yamaha YZ400F
74 Yamaha GTMX80
75 Honda MT250 x3
66 Honda CA77 305 Dream x2
67 Honda CB77 305 Super Hawk
2009 Yamaha YZ250 2-smoker
2008 Honda CRF150RB


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PostPosted: Sat Aug 13, 2016 10:16 pm 
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Joined: Tue Jan 27, 2004 8:51 pm
Posts: 136
Location: Gilbert, AZ
These have no regulators so MAKE SURE all wire connectors are clean and tight. If not your alternator will not get to the battery and run away as the lead acid battery "pushes back" against this (sorta regulates).
The manual says to check the water level before EVERY RIDE and I see why. I cooked my new battery in 3 months and guess what? No water inside.

On my '75 I carefully rebuilt EVERY switch on the handlebar and then cleaned EVERY push connector inside the headlight.

Also, be careful about the huge resistor on the headlight mount frame as without it the expen$ive headlight bulb will POP. Don't ask. ;)

Rick


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