Topic: Electrical Help

[Hyseman]

My starter button on by 73 CB750 works some of the time. When the button stops working, I can start the bike by using a screwdriver on the 2 large posts of the solenoid. Is this a bad solenoid or a bad starter switch?

[mb3000gt]

you need to do a little more testing. the solenoid has two skinny wires that control it. check a wiring diagram for the colors. disconnect the wire coming from the starter switch and touch it to the hot post of the solenoid. if the bike starts the solenoid is good. check the starter switch.

[Hyseman]

I disconnected the wire going the starter switch and touched the pos. post of the battery, nothing so i reconnected the solenoid and jumped the 2 large posts and it fired up. I think it is the solenoid.

[mb3000gt]

also check the clutch switch. you can just ground the other wire going to the solenoid (i think its g/r) and try again. i had a similar intermittent problem that i latter found was a bad connection in the clutch switch.

[CB750F2]

G/day. To test the solenoid disconnect the two small wires coming from the solenoid from the rest of the wiring harness. There are two conectors adjacent to the solenoid which enables you to do this. One wire will be black and will have a female connector on the end of it and the other wire will be yellow/red and will have a male connector on the end of it - this is looking at the two short wires connected to the solenoid. Apply 12volts to the black wire by connecting this wire to the large solonoid post - the one that has the large wire coming from the positive terminal of the battery - and ground the yellow/red wire. The solenoid should click in and the the starter motor should run. Please ensure the bike is in neutral and ignition switch off and do not cause any sparking to occur near the top of the battery -  batteries can explode. The most likely cause of your problem is in the wiring, connectors or switches. I do not have a K3 but I see on the wiring diagram a clutch switch, a neutral switch,  a starter switch, and a starter motor safety unit - all of which could prevent the solenoid from operating.  Hope this helps, Pat

[Hyseman]

It just gets deeper and deeper!

[Hyseman]

Just in case its a safety switch, is it wise to bypass or can it be repaired or replaced? If so how do I find it and how do I handle it?

[HondaMan]

If it's the solenoid - you can disassemble and clean the sliding surfaces and it will work again. These corrode up when sitting. Add a drop of oil on the sliding post.

[Hyseman]

Its running, I changed the solenoid and pushed the starter button and still nothing. I said @#%* it and kick started it just so I could go for a ride. After running a few minutes I shut it off to get my helmet and tried the starter button again. She started up using the starter button. I'm happy.

Thanks for all the advise and help

[chung]

The stock 750s start pretty easy, and you can ride. Life could be worse, I haven't had any of my bikes on the road in over a year

[kaceyf2]

wayne, JOIN THE CLUB!!!!!!! BIG TIME!!   I have been offthe road for nearly TWO DAMN years and it HURTS BAD>>>>> My F2's head is at the machine shop, and I cannot afford the work, I got bogged down in too much detail!!!  Then I started this 1973 K2 restoration,because my son was bugging me to do something, I have got it stripped right down to the frame and some P>O had painted it GREEN!!!
And its a #$%* to get off, paint stripper aint touching it at all, not even softening it!! BOO F******** HOOsville!!!!  I am having to take it off with rubbing paper and me fingers are bleeding!
whats your reasons for not being honda mobile??