Author Topic: First project (Read 4909 times)

GrandRapids750K3 · « **on:** March 23, 2011, 09:10:26 AM »

I've been getting a ton of good advice and tips to get my first project started. I picked up a 73 750k late last summer and am finally getting around to getting some things fixed. I rode the bike a bit last year and at this point I'm just trying to fix some of the easier, more important issues. Although reading a lot of these posts I am inspired to try alot more. Any advice or tips always welcome.

Issues I know about:
- no key/igntion
-wrong headlight
-wrong front blinkers
-wrong seat
-wrong rear wheel
-wrong carbs
-no airbox
-wrong exhaust

GrandRapids750K3 · « **Reply #1 on:** March 23, 2011, 09:16:45 AM »

Already ordered a new replacement seat, ignition bracket, and igntion.

Here are some pictures of what I'm working with.

Johnie · « **Reply #2 on:** March 23, 2011, 09:40:29 AM »

Looking forward to your build thread. Good pics and the fact the bike runs is a big plus for you. Looking at the wiring issue the previous owner created for you...is the fuse box still there? I can not see it on the left side picture under all those wires. I see the connection for it, but just wondering if the fuse box is still there? Looks like the previous owner also removed the center stand? Sometimes they do that as the OEM exhaust is where the center stand would rest when up. Without it the stand would rub on the chain. Below is a pic of my new blade type fuse box I just installed compliments of Hondaman. He is making and selling them on the board. You maybe saw his post. Might be something you want to do in the future. Not hard at all to install. Click pic to enlarge it.

GrandRapids750K3 · « **Reply #3 on:** March 23, 2011, 09:48:03 AM »

That does look nice. I'm thinking someday I may just rewire the entire bike. If for nothing else just so I can learn more about what I'm doing. It looks like the fuze box is there (three tube fuses). The center stand is gone, and from it looks like to me it was because of the exhaust that was put on. I did see Hondaman's posts, definitly something I'll be looking into for the future.

GrandRapids750K3 · « **Reply #4 on:** March 23, 2011, 09:55:00 AM »

In this picture you can see where they rigged up a switch (connected to the horn) for the igntion. And the plunger style switch connected to what I think is an air box bracket for the head light. That is what the additional red wires running through the bike are for.

Johnie · « **Reply #5 on:** March 23, 2011, 10:01:18 AM »

Here is a pic of what that wiring area should look like in the fuse area under that left side cover. That solenoid and stuff should be afixed to the side of the battery box.

GrandRapids750K3 · « **Reply #6 on:** March 23, 2011, 10:14:32 AM »

That will give me something to work towards. I think solenoid and other stuff is fixed to the battery box, its just hard to tell with all the wires running across the front of it. Where should the wire loom be running, since it obviously shouldn't me running across the frong of everything?

Johnie · « **Reply #7 on:** March 23, 2011, 10:46:22 AM »

Quote from: GrandRapids750K3 on March 23, 2011, 10:14:32 AM

That will give me something to work towards. I think solenoid and other stuff is fixed to the battery box, its just hard to tell with all the wires running across the front of it. Where should the wire loom be running, since it obviously shouldn't me running across the frong of everything?

The wiring loom in that area should be running along the frame tubing above the fuse box. It heads to the back about 6 inches past my finger to end where the wires exit to the 6 connections that go towards the back lights. I am pointing at the wiring loom below. Click pic to enlarge it. By the way, that round module to the right of my finger is the solenoid I mentioned which could have something to do with the starter issues.

GrandRapids750K3 · « **Reply #8 on:** March 23, 2011, 10:48:53 AM »

Great, I'll see if I cant get everything put back where it belongs.

Johnie · « **Reply #9 on:** March 24, 2011, 12:22:12 PM »

Here is the ignition location pic for you. Left side frame...

GrandRapids750K3 · « **Reply #10 on:** March 24, 2011, 02:01:50 PM »

A simple new ignition turned into a whole new project.

After diggin around I realized the the previous owner had cut a majority of wires around the headlight. I guess I'm going to learn how to do some wiring...

Johnie · « **Reply #11 on:** March 24, 2011, 02:10:31 PM »

As we discussed, you may want to consider a new wiring harness. If he cut all those wires it also looks like he cut the bullet connectors from the left and right handle bar controls? What was he thinking man? Some of the guys here have bought the wiring harness and they can give you the vendor if you decide to go that route. You are slowly saving another 750...nice work.

Bankerdanny · « **Reply #12 on:** March 24, 2011, 03:12:35 PM »

Oucg, My condolences on the wiring. That's my least favorite work.

Red750K1 · « **Reply #13 on:** March 24, 2011, 04:03:57 PM »

I have a couple "extra" wiring harnesses lying around. I think one's from a '74 so that should work for you, it has the lil extra wires for stuff like signal buzzer n' stuff I think. If you want another harness give me a shout!
Good luck!

GrandRapids750K3 · « **Reply #14 on:** March 24, 2011, 04:27:47 PM »

I am starting to think about a new harness... Especially as I think about working with all those short ends. Anyone have recommendations for new harnesses?

Johnie · « **Reply #15 on:** March 24, 2011, 06:03:37 PM »

Quote from: GrandRapids750K3 on March 24, 2011, 04:27:47 PM

I am starting to think about a new harness... Especially as I think about working with all those short ends. Anyone have recommendations for new harnesses?

You would do yourself and the bike a favor with another harness. Take Red up on his generous offer. You will still need to buy some bullet connectors from the Electrical Connection so you can connect the right and left handle bar wiring inside the headlight bucket to the harness.

GrandRapids750K3 · « **Reply #16 on:** March 24, 2011, 06:18:27 PM »

I do appreciate it Red. I'll let you know if I need it, how much would you want for it? I found a new on for $75 and since I'm totally green at anything wiring I think it might make things a litte easier. I'm doing some research and looking things over but I think I am going to end up just getting a new harness all together. I think that will be easier then trying to mess with matching up wires. What part of MI Red?

Johnie- I think I may look at the new fuse box from hondaman as well. Since this is not going to be the relatively quick and simple process I thought it was going to be I've decided to do it right, or as right as I can afford... I'll keep everyone posted.

Red750K1 · « **Reply #17 on:** March 24, 2011, 07:35:48 PM »

I'm just a tick north of Detroit. You should check out partsnmore.com, they have brand new harnesses for around 80. I've seen them at a few sites actually for under 100, good deal when you count everything in and the peace of mind a new harness gives ya. Plus no chasing down internal shorts!

Dont be intimidated at all by the wiring on these bikes, its actually really really simple. Its easier to think about it in "systems" and get a good wiring diagram then highlight each "system" individually. something like: ignition system, charging, lights . . . makes chasing things down easier and wiring everything up easier too. Oh and be aware of the two or three "mystery" wires that do nothing, like the green one under the left sidecover by the voltage regulator wiring harness and I think theres a mystery grey wire in the headlight bucket too, or maybe its a different color . . . good luck! its not too bad really

last little bit of advice . . . when you do install your new harness, take a bit of 400 grit and roll it into a little tube (gritty side out). Use this to clean the Female connections, just take the corrosion off so they're a bit shiny. Do the same to the Male connections as well as the block connections by the engine (big white plastic plug thingy) just slip the paper in and work it around best you can till its a bit shiny. Put everything back together with some dielectric grease, it'll weather proof it and you'll never have a wiring problem again or a short in wet weather either.

Ryan6838 · « **Reply #18 on:** March 24, 2011, 07:51:46 PM »

I changed all the connectors on my k8s harness and while i had fun doing it and re wrapping with new tape, if i were doing it again id just buy a new one. Fresh everything.

Retro Rocket · « **Reply #19 on:** March 24, 2011, 07:55:37 PM »

Quote from: GrandRapids750K3 on March 23, 2011, 09:55:00 AM

In this picture you can see where they rigged up a switch (connected to the horn) for the igntion. And the plunger style switch connected to what I think is an air box bracket for the head light. That is what the additional red wires running through the bike are for.

What carbs are they.?

GrandRapids750K3 · « **Reply #20 on:** March 25, 2011, 02:47:19 AM »

Thanks Red, very helpful. Partsnmore is actually were I found my harness. I'm getting excited to get it all wired up. It was a project I was hoping to do some day, just didn't think I'd be doing it this soon. I will feel much better once I know all the wiring is proper. I'm hoping to get everything ordered and ready to go by the end of month, so I'll keep my thread updated as I go.

Retro- I don't know a thing about those carbs other then they don't belong to the bike.... Hopin to find some originals someday, but that's probably this winter or next summer's budget...

Johnie · « **Reply #21 on:** March 25, 2011, 05:56:48 AM »

Here is a few pics of what your new system will look like in the bucket. You can see I used some masking tape for notes when I put it back together. You should have 5 wiring harnesses entering the headlight bucket. The main thick harness which runs from the center frame, the speedo harness, tach harness, left handlebar switch harness and right handlebar switch harness. They are all color coded and will just snap into place. Very wise move taking out the old harness. You will be much further ahead with that new harness for sure.

ekpent · « **Reply #22 on:** March 25, 2011, 08:04:02 AM »

The carbs are Mikuni. I also looked at the bike when it was for sale last year.

GrandRapids750K3 · « **Reply #23 on:** March 25, 2011, 08:21:21 AM »

Yea... I didn't realize there would be this much work that needed to be done. But then again I really didn't know what to look for. I wanted a project though to learn on and I will definitely get an education on this one...

Toxic · « **Reply #24 on:** March 25, 2011, 10:00:28 AM »

If you are "green" when it comes to wiring, the best thing you can do is a new harness.

Your's is butchered.

I've used the partsnmore one myself but I am not the only guy to have issues with it.

One of my brown/white wires didn't carry the current foreword.

It took me along time to figure it out, with allot of help from folks on here. BTW.

I would lay the new harness out and with your wiring harness check every wire for continuity. You will also gain a tremendous amount of insight when you are done.

Overall the bike looks good ... have fun

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Author Topic: First project (Read 4909 times)