Author Topic: K3 Project has now started.  (Read 34580 times)

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Offline MauiK3

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Re: K3 Project has now started.
« Reply #150 on: August 02, 2017, 08:26:48 PM »
Forgot to post this. My front fender, while fine on the outside, was getting pretty corroded underneath.. After a spell in the electrolysis tank, I cleaned it up, treated the rust with Ospho and coated it with this dark silver. I think it won't be too noticeable. I had to do something with it or it would be new fender time. As it is, I need two new calipers.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline MauiK3

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Re: K3 Project has now started.
« Reply #151 on: August 04, 2017, 07:21:27 PM »
Front wheel went much easier than the back wheel. I guess because the spokes are longer and the rim is a little less stiff. On the rear there is a deformation at the weld point the I don't think can be worked out. The front seems better all around.
Discovered I can't start torquing because my torque kit does not have the 5.6mm crows foot. Ordering one now.
On to carbs while I wait for stuff.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline MauiK3

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Re: K3 Project has now started.
« Reply #152 on: August 04, 2017, 07:22:37 PM »
Oh, and one more thing.
Just to make myself feel better, I assembled something!
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline budman

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Re: K3 Project has now started.
« Reply #153 on: August 04, 2017, 08:06:55 PM »
I installed rear sets on my first build, so I really didn't examine the factory foot pegs.  I want to run pegs in the factory mid controls and peg location on my chopper build, but the difference in length on the peg mounts is going to have to be dealt with.
Bud

1973 CB750K3 Chopper
2021 Indian Scout

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Re: K3 Project has now started.
« Reply #154 on: August 04, 2017, 10:43:02 PM »
I had a pretty mixed results work session on the bike this weekend. I did some application of the POR15 clear two part urethane on the polished parts.
The problem is that the urethane kicked off too quickly and the application doesn't look too great on some of the parts, I don't even want to post pictures yet.
There is a discrepancy on the instructions.
The data sheet states to mix the parts at 3 to 1, which I followed.
The can states the mix ratio as 4 to 1, which would have slowed it down.
I chose 3 to 1 fearing that it would not set up and create a big mess.
So now I'll wait until it gets pretty hard and wet sand the imperfections out and apply a top coat, mixed 4 to 1. Maybe our higher humidity here contributed to the problem since humidity contributes to  the hardening.
Live and learn.
If I can't clean up some of the problem areas I'll need to figure out how to remove the coating and start over.
Ugh



Thanks for the 'tip', I never realized this about the urethane. It explains troubles I have had with the paint here, where it's like a desert most of the time in the summer.
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
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Offline MauiK3

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Re: K3 Project has now started.
« Reply #155 on: August 05, 2017, 09:55:27 AM »
I'm going to try and mix a batch of clear urethane again and thin it with Zylene, the directions say about 10%. I'll test it on something and report results. I have to believe it works, POR 15 is a good company. The POR15 black works great.
In the case of the black, I buy small cans and try to use them up quickly. Once a can is opened the clock is ticking.
I think I'm dealing with our higher humidity here, which kicks it off.
In all cases I am trying to slow down the effects of our marine environment by protecting as much as I can. I am even going to coat the under side of the nos rear fender to prevent what happened to the front fender.
My neighbor across the street has a fairly new Harley Davidson which he rides a lot, his forks and many other parts are corroding after just a year or two. Hard to stop the effects.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline MauiK3

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Re: K3 Project has now started.
« Reply #156 on: August 06, 2017, 09:49:23 PM »
Mixed up some fresh Simple Green 50% in the ultrasonic. Put the stripped down carbs  in for about 20 minutes. Made pretty quick work out of it.
Before and after.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline MauiK3

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Re: K3 Project has now started.
« Reply #157 on: August 06, 2017, 10:33:29 PM »
Better picture, with the authoritative tome as a backdrop. :-))
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline MauiK3

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Re: K3 Project has now started.
« Reply #158 on: August 07, 2017, 09:04:56 PM »
Finally dropped the frame, swing arm and center stand off for media blast. Also getting the steering stops and the inner rear fender holder weld repaired.
Waiting on carb kits to assemble carbs.  Still lots to do, I have to take it one system at a time. Reminds me (on a small scale of course) of how we had to approach re-assembling a nuclear submarine engine room during overhaul. If you spent too much time thinking about all of it you went nuts.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline MauiK3

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Re: K3 Project has now started.
« Reply #159 on: August 10, 2017, 03:54:21 PM »
Things are happening.
Picking up the frame today.
Fork tubes came in.
Carb kits came in.
I'm the hold up now, lots of work to get to.
On another item, has anyone seen a spark advancer like this? It does not have any markings like what I see in other pictures.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline Stev-o

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Re: K3 Project has now started.
« Reply #160 on: August 10, 2017, 03:59:13 PM »

On another item, has anyone seen a spark advancer like this? It does not have any markings like what I see in other pictures.


We've had that discussion before, look here....


http://forums.sohc4.net/index.php?topic=113338.0
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline MauiK3

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Re: K3 Project has now started.
« Reply #161 on: August 10, 2017, 08:02:24 PM »
Just read it, mine is AD125, whatever that is.
Have to research this some more.
Got my frame back with repaired inner fender tabs and steering stops. Will post photos later.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline Stev-o

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Re: K3 Project has now started.
« Reply #162 on: August 11, 2017, 07:11:50 AM »
Just read it, mine is AD125, whatever that is.


Info from Scottly on that advancer thead:

Honda used two different suppliers for the advancers. One was TEC, and the other was Denso. The symbol near the 2-3 timing marks on your unit is Denso. My K1 has a similar part.
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline MauiK3

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Re: K3 Project has now started.
« Reply #163 on: August 11, 2017, 09:04:02 AM »
Ok, great, thank you, I was afraid it was a non-Honda replacement by the PO for some reason, I was about to order a new one.
This forum is such a great resource.

By the way, I found a simple way to install new break shoes on the backing plate with a tool most of us have laying around, I will post a picture later, it works great and solves a problem.

Steve
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline MauiK3

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Re: K3 Project has now started.
« Reply #164 on: August 11, 2017, 02:31:35 PM »
Getting the cleaning done prior to applying POR15.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline MauiK3

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Re: K3 Project has now started.
« Reply #165 on: August 11, 2017, 06:30:09 PM »
I posted this to tips and tricks.
This is how I spread my rear brake shoes to get them over the cam. Pretty stone axe simple but worked great, no drama.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline MauiK3

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Re: K3 Project has now started.
« Reply #166 on: August 11, 2017, 06:35:03 PM »
Frame with POR15 and their chassis black top coat. Went on pretty easy, used way less paint than I thought it would.
I did the whole thing using their cleaner/degreaser, the metal prep and then the paint.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline Stev-o

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Re: K3 Project has now started.
« Reply #167 on: August 11, 2017, 07:04:01 PM »
Your "paint booth" looks very nice!
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

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Re: K3 Project has now started.
« Reply #168 on: August 11, 2017, 08:00:40 PM »
I like the sheen of the black! Is it a high-gloss, or...?
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline MauiK3

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Re: K3 Project has now started.
« Reply #169 on: August 11, 2017, 10:50:38 PM »
POR15 black by itself is not UV stable so you have to spray on one of their Top Coat products. The POR15 is brushed on and is very much self leveling. For top coat I used their "chassis black".
This product was featured on Jay Leno's Garage and I liked it. I also had the mechanic shop in my last job use it to preserve heaven equipment trailers and the like. It's pretty tough stuff if you don't mind the process.
When I was spraying I had lots of plastic down and over and wet everything else down to prevent overspray issues. It worked, I think.
I got my supplies at the local auto refinishing dealer.
Thank you for the feedback.
Steve
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline budman

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Re: K3 Project has now started.
« Reply #170 on: August 12, 2017, 01:34:50 AM »
The frame looks great.
Bud

1973 CB750K3 Chopper
2021 Indian Scout

Offline MauiK3

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Re: K3 Project has now started.
« Reply #171 on: August 12, 2017, 09:19:33 AM »
I'm a Jay Leno's Garage fan. If anyone is interested, go to YouTube and search for
POR15 Jay Leno and you'll find the video, it's pretty interesting.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline MauiK3

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Re: K3 Project has now started.
« Reply #172 on: August 12, 2017, 09:53:23 PM »
I've never posted from my phone so here goes. I'm at a wedding on the beach at sunset.
Got my carbs put together, still need washers and cotter pins for choke linkage. I also still need
108 jets. Things are going well.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline MauiK3

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Re: K3 Project has now started.
« Reply #173 on: August 12, 2017, 10:03:55 PM »
This time of year our sunsets are interrupted by the island of Lanai unless we go up to Lahaina. Bummer
I'm on the south side. Still, not too bad after all day bent over the carbs.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline Stev-o

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Re: K3 Project has now started.
« Reply #174 on: August 13, 2017, 07:22:04 AM »
Still a great photot.  I'll never forget my first sunset on Hawaii, it appeared like the sun was sinking in the Pacific.   
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........