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HELP with KZ 650 Electrical Problem 29 Jun 2015 11:15 #678711

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I have a 78 KZ 650 (C3?) that I bought a few months ago. Bike was a runner right off the bat, but had changed hands a few times and needed a lot of TLC and cleaning up.

The wiring (while mostly original) has had some modification over the years and is not the neatest in some places. While poking around, fixing a turn signal and lighting issue one day, the jostling must have created a short, because the main (20A) fuse blew and everything went dead. As I did not have a spare on hand, I went through the exposed wiring fixed any possible shorts and exposed wires / connections and it was the end of the day for me, Upon getting the right fuse I placed it in the fuse box and was pleased to see that the lighting was fixed. However, when I went to start the bike, I kicked it several times and got no response (usually takes a kick or two). I then tried the starter and got no response whatsoever - did not even spin.

Tested voltage at the battery and its fine. At the main fuse, it read a fraction of a volt? When I jump the starter relay it turns over fine. Pulled the #4 plug and it looks like no spark.

I'm new to all this but love to tinker. What is the best plan for going forward and troubleshooting this issue.

Thanks!
78 KZ650 C2 -

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HELP with KZ 650 Electrical Problem 29 Jun 2015 12:01 #678723

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You need to first identify what year & model motorcycle you own. It matters because there are significant differences in the charging systems between the various models. The 1978 KZ650 is either a B2; B2A; C2; D1; or D1A. The KZ650-C3 is a 1979 model. What is the VIN number stamped into the frame on the steering neck, and what is the serial number of the engine stamped near the oil filler cap? These numbers will let you discover what you own. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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HELP with KZ 650 Electrical Problem 29 Jun 2015 17:30 #678772

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It is a C2. The C3 I cited in the original post was a typo.
78 KZ650 C2 -

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HELP with KZ 650 Electrical Problem 29 Jun 2015 17:31 #678773

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In that case here's a wiring diagram that may be helpful. Ed

diagrams.kz650.info/wiring/images/KZ650-B2,C2.jpg
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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HELP with KZ 650 Electrical Problem 29 Jun 2015 17:44 #678777

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Thanks!
I actually have that as I acquired the official KZ650 service manual from my uncle who is a KZ guy as well.

I'm a tinkerer by nature and rode an american bike for a while, but returned to Kawasaki as I always rode KX's as a kid. Was just wondering if there was a normal course of action when have something like this or the benefit of someone else's experience. I have tools and a multimeter and am dying to get out on the bike.
78 KZ650 C2 -

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HELP with KZ 650 Electrical Problem 29 Jun 2015 20:48 #678796

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I thought one of the electrical gurus might be around by now. ...hopefully later.

The wiring diagram for your 650 is similar but not identical to that for my 750.
First thing I always do is check the connections at the batery negative post and use the multimeter set to Ohms to check for continuity between post and frame and post and motor. The cable ffrom your negative post will split with one branch going to a bolt on the motor and the other into the harness. check all these thoroughly. On my bike the circuit for some of the lights is completed by grounding to the frame but I would'nt swear this is the same for the 650.

Next follow the power from the positive post
There should be two cables from the battery positive post. One goes to the starter solenoid and yours seems to connected correctly as you were able to "jump"it and turn the starter. The other goes to the main fuse. If you are only seeing a fraction of a volt here with battery voltage ok (12.3V) then I have to question how you measured voltage. Unless you have something morethan a fraction at the fuse then I would not expect you to have lights. With meter set on Ohms check continuity between fuse and battery positive post. With meter set on VDC check voltage between fuse and frame and or fuse and motor.

If all that checks out then next place to look is behind the headlight. Power goes from the main fuse through the harness to the big connector in the headlight shell. Check continuity and voltage here.

The wiring diagram has a table of connections at the bottom for the ignition switch.. Check as above.

If all checks out here then check voltage and continuity in the right handlebar switches. In summary power goes from battery to main fuse to ignition shitch from which it goes to lights, ignition, starter button, coils etc

A Final thought - is the kill switch at off when it should be at run ?

That should get you started until someone more knowledgeable that I am comes along

Goodluck
1980 kz750E1, Delkevic exhaust

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HELP with KZ 650 Electrical Problem 29 Jun 2015 22:06 #678802

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Thanks brother!
Exactly the type of rundown I was hoping for to get me off and running. Hoping to get a crack at it tomorrow and I'll do as you say in addition to testing regulator and coils etc. as the maintenance manual dictates. (BTW, good catch at my mistake for voltage at the fuse. That was me just being a bonehead and confusing myself as there is plenty of voltage there)

Thanks again,
Sam
78 KZ650 C2 -

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HELP with KZ 650 Electrical Problem 01 Jul 2015 20:25 #679048

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Cleaning Motorcycle Electrics

Get some of the De-Oxit electrical contact cleaner and figure on spending a good day going from the front of the bike to the back. It’s a plastic safe cleaner/preservative. www.deoxit.com is their website.

On the older Kawasaki's, a majority of electrical connectors are inside the headlight housing requiring removal of the headlight, then the fun begins.

Do one set of electrical connectors at a time to avoid mixing up what connects to where. Usually disconnecting, spraying with De-Oxit and reconnecting is about all you'll need.

However, when encountering the green crud of corrosion, a brass wire brush may be needed on the pins you can reach.
Some 400-600 grit wet and dry sandpaper strips rolled into a tube should reach the male and female pins in the more difficult to clean connectors.

Smoker’s pipe cleaners, cotton swabs and wooden toothpicks work as cleaning aids.

Really small electrical connectors may require the use of a welders tip cleaning tool assortment.

Most pins in the connectors are coated with a thin plating of tin, and others may be nothing more than copper or brass.

If moisture is added, the resulting corrosion lowers the voltage/current being carried causing dim lights, slow engine cranking, slow turn signal response and lower input voltage to the ignition coils resulting in weak spark.

The left and right handlebar switch pods will need attention too as they have circuit functions like turn, horn, run/stop, and start.

Usually a spritz or two with actuation of the switch is about all needed for these switches unless corrosion is detected and then careful disassembly is required.

The ignition switch may or may be not sealed to allow spraying the internal contacts. I urge caution if attempting to open this up as springs, and ball bearings may fly out never to be seen again!

If your bike has the older style glass tubed fuses, I suggest replacing them as vibration can cause internal failure. AGX is the type used, and most auto parts stores can get them for you.

Clean the fuse holder clips, looking for signs of overheating(discolored insulation, signs of melting).
I use metal polish on a cotton swab, followed by spraying another clean swab with the De-Oxit and then rubbing the inside of the fuse clip.

All battery cables must be clean and tight for maximum current transfer. Check the cables going from the Negative(-) battery terminal/post to the engine mounting bolt

Also the one going from the Positive(+) terminal to the starter solenoid and from there to the starter motor.

If any battery cable feels ”Crunchy” when flexed, replace it as possible corrosion is inside the insulation.

Each "Bullet Connector" will have to be sprayed to ensure good connectivity, especially the ones going to the energizing coil of the starter solenoid.

The alternator output “Bullet Connectors” are usually behind the engine sprocket cover and will need inspecting and cleaning too.

The turn signal light sockets will benefit from a spritz from the contact cleaner along with the tail light/brake light socket.

Some brake light switches can be sprayed on the actuating rod, with the spray running down inside to the electrical contacts, others may be sealed requiring replacement if the switch is intermittent in operation.

Some people put the Di-Electric Grease on cleaned terminations/connectors, I don’t, as I’ve read/heard it can cause problems when it gets hot, actually insulating the connections, so the choice is yours to use or not.

Using WD-40?
Bad idea! WD40 is a bad thing to use on wires, contacts, etc.! More than one person on this site has suffered the effects of using it that way. Use Deoxit or some other contact cleaner to clean that WD40 off anything electrical before that WD40 crap sets up and becomes an insulator.


As a matter of fact dielectric grease isn't a great idea either. Dielectric is essentially an insulator for the purposes of conducting electricity. I've spent many hours cleaning dielectric grease out of connections. It heats up, liquefies, then gets wicked into contacts. The contact area that actually carries current then is reduced and heats up more.

Just got done replacing headlight connectors on a Civic. They were full of grease (that looked cooked), and the bulbs were dim. Only chopping off the connectors and replacing them got the bulbs back to full brightness

I think I've covered about all of the electrical systems on the bike.........


“I spent a weekend going through every electrical connection and switch on the bike with a little scotchbrite pad and DeOxit - what a difference! Everything was brighter, gauge backlights, indicator lights, turn signals, I was getting a nicer spark, it fired up quicker, etc. Well worth my time. WELL worth it! “
From a forum member at www.kzrider.com


Re: Cleaning the many and various Motorcycle electrics.
I used the De-oxit D-5 spray on all the electrical connections of my 78 Kz1000 that had sat for twenty years .

When I parked the bike in 92 I was starting to have troubles with some of the electrical system, but after pulling everything apart and giving it a spray , reconnecting the connectors and working them back and forth a few times, then gave them another shot of spray to wash them off before the final reconnection.

Everything still works perfectly and has for over 7000 miles this year.

I am extremely happy with the results , a lot of the connectors were green when I started and after the cleaning they looked new ( shiny gold )

I found the Deoxit D-series, D-5 spray in a 4 oz can at a big electronics store called Frys in Illinois, don't get the small cans at Radio Shack , they are different and meant for computer type stuff.

store.caig.com/s.nl/sc.2/category.188/.f


Recommendations:
Excellent contact cleaner from audio to ac power contacts
I've been an A/V Tech-Roadie for over 30 years and have used Deoxit since it was first introduced. I've cleaned /rejuvenated volume controls,switches and audio connections on everything from guitar amps to full blown recording consoles. It not only cleans mild to excessive corrosion but the lubricant keeps the part in good working order months afterwards. Much easier than replacing a hard to replace part. I also spray it on all the audio connectors periodically to insure good connectivity. Along with my A.C. power plugs and quad boxes that are used outside for live shows to prevent corrosion from the elements.
Good stuff. Obviously highly recommended.


Great Stuff
I used this stuff on my 35 year old Kenwood KA-7300 amp which had not been used in more than 10 years and it was fantastic. When I first tried to use the amp, all of the switches only worked sometimes and the static and intermittent sound was unbearable. I thought that my left channel was not working because it had such a low output compared to the right channel no matter where the balance was set. After cleaning all the input/ and output jacks and the switches along with vacuuming out the inside of the amp, the amp works great and sounds like it did back in the day! I was more than pleasantly surprised!!

I've used DeoxIT for years. My first use was on a BMW instrument cluster that an $800 "reno" hadn't fixed. I sprayed the several connectors and mates, dozens and dozens of connectors, let it sit overnight and reinstalled it in the car. That cured every problem. Years after manufacture one or more of those connections could get iffy, and they do. Since then I've fixed several instrument clusters, engine and transmission computer problems caused by the same thing, connections, and no telling how many other electrical connection problems in cars.

An Effective cleaner-rejuvinator!
I used this to clean the pots, switches, and faders on my old Allen & Heath SR416 mixer. Everything is working top-notch again and everything moves/slides with ease. DeoxIT is a great product and it always improves sound quality and equipment life. This is the only cleaner you need!


missionkz's wrote:
Pull the handle bar controls apart and wash out the contacts with De-Oxit, My horn didn't work for quite a while or was crazy anemic.... then I shot the control with De-Oxit and it works and sounds like new.
Actually I did both left and right control assemblies like this and they all work like new again.

Trust MFolks , the guy's a true rocket scientist and really knows what he's talking about.
1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)

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HELP with KZ 650 Electrical Problem 01 Jul 2015 20:27 #679049

  • MFolks
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If your switches and light bulb sockets are crumbling from faulty factory soldering jobs, here's how to fix them:

Repairing crumbled switch and light bulb socket soldering.

Some of the older Kawasaki's, and possibly the other brands of motorcycles may be experiancing crumbled or failed switch and light bulb factory soldering jobs. Here's a repair procedure:

When repairing soldered wires on motorcycle switches or light bulbs sockets, have the following on hand:

1. A 25 Watt soldering iron or one that the wattage can be adjusted.

2. Rosin core solder.

3. Rosin flux or soldering paste (Never use solder or soldering paste designed for plumbing work, as it contains an acid that will corrode the electrical joint, ruining it).

4. 91% rubbing Alcohol, or 70%. The lower percentage will clean up flux residue, but not as good as the higher percentage stuff.

5. A cut down ½” paint brush, or acid brush for scrubbing the repaired solder joint.

6. Clean rags or paper towels

7. A damp sponge to keep the soldering iron tip clean.

8. Some “Solder Wick” a braided bare copper wire designed to collect heated excess solder, aiding in joint preperation, available at electronic supply stores.

9. Some wooden toothpicks.

10. Small Hemostats or clip on heatsinks.

A. Before soldering, “Tin” the soldering iron tip by plugging it in or turning the iron on, allowing it to get to operating temperature(2-3 minutes).

B. Unroll about 3” of solder from the roll of rosin core solder & then using a clean rag or paper towel moistened with Alcohol, wipe the unrolled solder, removing the finger print oils that will create a poor solder joint.

C. Apply a small amount of solder to the now heated soldering iron tip, wiping the excess off with the wet sponge or rag, keeping a thin layer of solder on the soldering iron.

D. The soldering iron is now ready for use, but before applying the heated tip to a wire, wipe the tip on the damp sponge or rag, this removes any oxidized solder and makes for a much better connection.

E. If the joint to be repaired is grey in color or appears “Crumbled”, apply some rosin soldering paste or flux to the joint with a small toothpick of screwdriver, and then apply the soldering iron tip for a few seconds.

G. The fluxed joint should clean up, allowing for a better connection. If no luck, use the solder wick to remove all traces of the old solder by apply in it between the soldering iron tip and the bad joint.

H. Hemostats and clip on heatsinks will be used to prevent the wire insulation from burning, overheating & pulling away from the connection.

I. Apply a small amount of flux to the joint to be repaired & then a very short duration of heated soldering iron tip & solder(like a few seconds or so).

J. Clean off the repaired joint with the brush & rubbing Alcohol, the newly repaired joint should appear clean and bright, almost as if it were polished, with no voids or holes.
1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)

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