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Author Topic: Dead 750k4 Help Plz!  (Read 3030 times)

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Offline exf5003

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Dead 750k4 Help Plz!
« on: August 22, 2012, 01:07:43 PM »
I just got out of work and my 74 750 is completely dead. No lights or anything with the turn of the key.  The fuses look good, I keep spare 15 amp fuse with me and replaced it with no luck. She started right up this morning with no problems and didn't notice anything strange. My ground is well connected and clean.
I have been using this bike daily without any problems in weeks.
I'll have to wait for a ride home to grab some tools and check battery.
Any suggestions on what all I should check and go through? I do not want to leave my bike behind parked in the city...  :-\
Any help would be appreciated! Thanks.
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Offline Tugboat

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Re: Dead 750k4 Help Plz!
« Reply #1 on: August 22, 2012, 01:08:42 PM »
Bad ignition switch?
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Offline LesterPiglet

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Re: Dead 750k4 Help Plz!
« Reply #2 on: August 22, 2012, 01:14:53 PM »
Yes, try jiggling your ignition switch and see if you get power. These switches wear out over time.
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'Then' and 'than' are completely different words and have completely different meanings. Same with 'of' and 'have'. Set and sit. There, their and they're. Draw and drawer. Could care less/couldn't care less. Bought/brought FFS.


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Offline Sdsbassist

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Re: Dead 750k4 Help Plz!
« Reply #3 on: August 22, 2012, 01:19:53 PM »
+1
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Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

Offline OldSchool_IsCool

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Dead 750k4 Help Plz!
« Reply #4 on: August 22, 2012, 01:22:11 PM »
+2. Loose ignition contacts are a common problem.
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Can I have a motorcycle when I get old enough?
If you take care of it.
What do you have to do?
Lot’s of things. You’ve been watching me.
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Is it hard?
Not if you have the right attitudes. It’s having the right attitudes that’s hard.

Offline exf5003

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Re: Dead 750k4 Help Plz!
« Reply #5 on: August 22, 2012, 01:27:17 PM »
Thanks for the quick replies, I jiggled the ignition switch and pushed it in to try and fix a loose connection but no luck. I should b getting a ride soon so I'll get my multi meter and tools. Any other suggestions?
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Offline Johnie

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Re: Dead 750k4 Help Plz!
« Reply #6 on: August 22, 2012, 01:30:22 PM »
How old is the battery? They can die that fast. Find a spare to take with you. Let us know what you find out. I hope someone did not disconnect a lead on you for a joke?
« Last Edit: August 22, 2012, 01:33:13 PM by Johnie »
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1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
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Offline exf5003

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Re: Dead 750k4 Help Plz!
« Reply #7 on: August 22, 2012, 01:44:06 PM »
Battery is new beginning of this year. Ignition is about two years old so I do not suspect it going bad, but who knows. Im hoping for a simple fix right about now even if its a cruel joke.
Any other suggestions would be great, thanks again guys.
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Offline LesterPiglet

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Re: Dead 750k4 Help Plz!
« Reply #8 on: August 22, 2012, 01:53:46 PM »
When I lost the key to mine I gave it power by crossing one of the other fuses to the main one, if you are stuck.
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'Then' and 'than' are completely different words and have completely different meanings. Same with 'of' and 'have'. Set and sit. There, their and they're. Draw and drawer. Could care less/couldn't care less. Bought/brought FFS.


Les Ross.            Certified by a Professional

Offline exf5003

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Re: Dead 750k4 Help Plz!
« Reply #9 on: August 22, 2012, 02:34:08 PM »
Hey Les, how did you cross them? Never done that, don't want to screw anything else up?
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Offline Johnie

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Re: Dead 750k4 Help Plz!
« Reply #10 on: August 22, 2012, 02:59:21 PM »
I had a 3 month old battery from Batteries Plus die. It showed volts but produced no amps. I was happy to receive a free replacement. Never bought another from there. I stay with the Yuasa now.
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1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

Oshkosh, WI  USA

Offline LesterPiglet

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Re: Dead 750k4 Help Plz!
« Reply #11 on: August 22, 2012, 03:11:23 PM »
Quote from: exf5003 on August 22, 2012, 02:34:08 PM
Hey Les, how did you cross them? Never done that, don't want to screw anything else up?
I just put a wire from one fuse to the other. I can't remember which but one will be the main fuse.
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'Then' and 'than' are completely different words and have completely different meanings. Same with 'of' and 'have'. Set and sit. There, their and they're. Draw and drawer. Could care less/couldn't care less. Bought/brought FFS.


Les Ross.            Certified by a Professional

Offline exf5003

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Re: Dead 750k4 Help Plz!
« Reply #12 on: August 22, 2012, 03:34:51 PM »
Battery is showing 12.6 volts, but worried could be what Johnie posted. Might have to take it out and get it checked out. Wish I had a spare to test against. If its not the battery and jiggling ignition doesn't work... anything else I can try?  ???
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Offline OldSchool_IsCool

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Re: Dead 750k4 Help Plz!
« Reply #13 on: August 22, 2012, 03:42:17 PM »
As I recall, the ignition switch is located under the tank and has 4 wires.  If that's correct, unplug  the ignition switch pigtail from the main harness.  Then, jumper the red wire to the black wire on the harness.  Do you he lights?
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Can I have a motorcycle when I get old enough?
If you take care of it.
What do you have to do?
Lot’s of things. You’ve been watching me.
Will you show me all of them?
Sure.
Is it hard?
Not if you have the right attitudes. It’s having the right attitudes that’s hard.

Offline LesterPiglet

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Re: Dead 750k4 Help Plz!
« Reply #14 on: August 22, 2012, 03:48:43 PM »
Test for power at your fuses.
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'Then' and 'than' are completely different words and have completely different meanings. Same with 'of' and 'have'. Set and sit. There, their and they're. Draw and drawer. Could care less/couldn't care less. Bought/brought FFS.


Les Ross.            Certified by a Professional

bollingball

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Re: Dead 750k4 Help Plz!
« Reply #15 on: August 22, 2012, 04:31:43 PM »
Quote from: OldSchool_IsCool on August 22, 2012, 03:42:17 PM
As I recall, the ignition switch is located under the tank and has 4 wires.  If that's correct, unplug  the ignition switch pigtail from the main harness.  Then, jumper the red wire to the black wire on the harness.  Do you he lights?

Do you have lights????
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Offline LesterPiglet

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Re: Dead 750k4 Help Plz!
« Reply #16 on: August 22, 2012, 05:15:52 PM »
No. It's in the original post.
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'Then' and 'than' are completely different words and have completely different meanings. Same with 'of' and 'have'. Set and sit. There, their and they're. Draw and drawer. Could care less/couldn't care less. Bought/brought FFS.


Les Ross.            Certified by a Professional

Offline OldSchool_IsCool

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Re: Dead 750k4 Help Plz!
« Reply #17 on: August 22, 2012, 05:27:21 PM »
But do the lights come on when the red ignition wire is jumpered to black?
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Can I have a motorcycle when I get old enough?
If you take care of it.
What do you have to do?
Lot’s of things. You’ve been watching me.
Will you show me all of them?
Sure.
Is it hard?
Not if you have the right attitudes. It’s having the right attitudes that’s hard.

Offline exf5003

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Re: Dead 750k4 Help Plz!
« Reply #18 on: August 22, 2012, 06:25:29 PM »
Being parked in the city I am limited to what I can do out there. I was going to have it towed but I started pushing it down hill with ignition in on position. Remind you that no lights or anything came on before, but while slowly pushing the lights came on and I was able to start her up!  :D
I just now got her home safe  ;D I turned ignition off and tried again. When turning the key the lights didn't come on again, so I tried again quickly and the lights lit up. I've tries another dozen times and lights up now.
Am I safe to say that my ignition switch could be going bad?
Thanks again everyone for the help I was scarred leaving my any out in the city streets!
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Offline OldSchool_IsCool

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Re: Dead 750k4 Help Plz!
« Reply #19 on: August 22, 2012, 06:42:45 PM »
I wouldn't trust that key switch.  You mentioned that it was replaced 2 years ago.  Emgo, by chance?

Oh, and glad to hear you got 'er home safe!!
« Last Edit: August 22, 2012, 06:45:19 PM by OldSchool_IsCool »
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Can I have a motorcycle when I get old enough?
If you take care of it.
What do you have to do?
Lot’s of things. You’ve been watching me.
Will you show me all of them?
Sure.
Is it hard?
Not if you have the right attitudes. It’s having the right attitudes that’s hard.

Offline Stev-o

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Re: Dead 750k4 Help Plz!
« Reply #20 on: August 22, 2012, 08:56:02 PM »
Almost sounds like dead battery...
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline exf5003

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Re: Dead 750k4 Help Plz!
« Reply #21 on: August 23, 2012, 06:12:53 AM »
Tested the battery and came out good. I have been trying to reproduce what happened yesterday a good dozen + times, but has been turning on like normal.
I took a risk and drove her into work, i just cant let her sit with such a beautiful 80 degree day out. Crossing my fingers thought  ;)
Everything seems to be pointing to a bad ignition switch.  I have noticed that the key has been harder to insert and pull out of the ignition switch, maybe some innards are going bad ???
it is a cheap Emgo... do you guys have any recommendations for a better ignition switch that wont break the bank? < $70
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Offline OldSchool_IsCool

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Dead 750k4 Help Plz!
« Reply #22 on: August 23, 2012, 06:21:04 AM »
Factor in what it would have cost you for that tow yesterday and I bet $70 starts to sound like a bargain! 

But yea, there prolly is an option somewhere between Emgo and OEM.
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Can I have a motorcycle when I get old enough?
If you take care of it.
What do you have to do?
Lot’s of things. You’ve been watching me.
Will you show me all of them?
Sure.
Is it hard?
Not if you have the right attitudes. It’s having the right attitudes that’s hard.

Offline LesterPiglet

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Re: Dead 750k4 Help Plz!
« Reply #23 on: August 23, 2012, 06:29:08 AM »
This is cheap enough, don't know what shipping is like tho.

http://www.davidsilverspares.co.uk/CB750K-FOUR-1976-USA/part_170150/
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'Then' and 'than' are completely different words and have completely different meanings. Same with 'of' and 'have'. Set and sit. There, their and they're. Draw and drawer. Could care less/couldn't care less. Bought/brought FFS.


Les Ross.            Certified by a Professional

bollingball

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Re: Dead 750k4 Help Plz!
« Reply #24 on: August 23, 2012, 07:03:09 AM »
Quote from: LesterPiglet on August 22, 2012, 05:15:52 PM
No. It's in the original post.

My bad I see it now.
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