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Author Topic: 1979 CB750F Tracker (maybe?)  (Read 8738 times)

Offline jordandogtown

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Re: 1979 CB750F Tracker (maybe?)
« Reply #140 on: Mar 25, 2019, 15:15:48 »
The beefed up battery box also gives me some ideas for securing the tank. I really don't want to use the original mount since the seat will be below the tank, and I don't want to cut into the seat pad to run the bolt through it. The places where the side panels mount seem like the obvious idea, but I didn't want them to support the weight of ~5 gallons. Plus, I'm sure there needs to be some sort of rubber "cushion" incorporated like the original mounts.

I cut some foam strips for a proof of concept. I'll find some durable rubber for the final test. They will be secured to the frame, and will support the weight of the tank as well as provide some shock absorption.



That gives me some different options for the side mounts, which will just hold the tank from sliding side to side or lifting up when I'm recreating Evel's Caesar's Palace jump. Right now I'm thinking of welding a threaded sleeve/spacer to the gusset, that will reach the back of the mounts. That would prevent me from over-torqueing the bolts and bending the mounts. I've also mocked up some different L brackets but I think the spacer would be the cleanest and plenty strong if I fit it into a hole in the gusset before welding. Any other ideas?



I actually kind of dig the utilitarian look of using these mounts - especially with some trick drilled washers from the CR

« Last Edit: Mar 25, 2019, 15:17:21 by jordandogtown »
"A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils, and lunatics" George Fitch, 1916

1979 CB750F Tracker (maybe?)

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1979 CB750F Part Out

Offline teazer

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Re: 1979 CB750F Tracker (maybe?)
« Reply #141 on: Mar 25, 2019, 18:15:12 »
That's a neat solution, but how thick is that steel plate?  It may be an optical illusion but it looks thicker than desirable.  And of course I make things out of 20 gauge thin steel so everything else looks thick to me. :-)

Offline jordandogtown

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Re: 1979 CB750F Tracker (maybe?)
« Reply #142 on: Mar 26, 2019, 08:51:38 »
That's a neat solution, but how thick is that steel plate?  It may be an optical illusion but it looks thicker than desirable.  And of course I make things out of 20 gauge thin steel so everything else looks thick to me. :-)

There's a little better explanation on the last page, but it's 3/16" according to my Harbor Freight calipers. Definitely overkill, but it's what I had on hand and I decided to sacrifice some weight to prevent another trip to town  ;D

At least this way I shouldn't have to worry about not having enough support under the subframe
« Last Edit: Mar 26, 2019, 08:54:36 by jordandogtown »
"A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils, and lunatics" George Fitch, 1916

1979 CB750F Tracker (maybe?)

Instagram

1979 CB750F Part Out

Offline jordandogtown

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Re: 1979 CB750F Tracker (maybe?)
« Reply #143 on: Mar 26, 2019, 11:58:40 »
I got this rad little $50 GP Style muffler courtesy of China. I did not have high hopes for it but it's actually pretty well made. I've seen some eerily similar ones on a few websites for over twice as much. I really wanted the raw works look of the real deal cone pipes, but for the price I think this one will do just fine. 

I'll probably end up welding a reducer after the 4-1 collector on the headers I have now.









It also has a removable "dB Killer" plus a fiberglass packed baffle throughout the entire pipe.




« Last Edit: Mar 26, 2019, 12:00:34 by jordandogtown »
"A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils, and lunatics" George Fitch, 1916

1979 CB750F Tracker (maybe?)

Instagram

1979 CB750F Part Out

Offline jordandogtown

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Re: 1979 CB750F Tracker (maybe?)
« Reply #144 on: Apr 08, 2019, 15:01:56 »
Work has been slow but steady the past couple weeks. Spring is always a busy time around here, but I'm still hoping to be on the road by summer.

I started brainstorming ideas to mount the seat pan. Although they're adequate, I'm not a fan of the super simple pipe clamp/bolt/rubber stopper method that a lot of people use. I'm sure the fiberglass is plenty strong but I want to support it a little more down the sides. I got the seat pan placed and worked out the angles, tested everything with wood, and finally cut some 3/4" angle iron to match. The rear cross member is just behind where the majority of my weight will be, and I'll eventually add a matching front cross member to give me some more mounting points. The frame will be welded to the top of the subframe, and I'll use some captive nuts on the underside to run some bolts through the top of the seat pan. Velcro/double sided tape should hold the seat pad in place well enough and still let me remove it if need be.





I also managed to knock out what was left of the steering stem bearings. The top race came out with a PVC pipe and a couple good wacks of the hammer. The bottom race needed some help. These sit inside a lip that prevents almost anything from getting any leverage on it. I used every crowbar/screwdriver shaped tool I could find but no luck. I finally put a couple quick welds around the inside, and the race all but fell out on it's own. Very cool



New steering stop tacked on the underside of the original. This placement actually worked out perfect, and was a lot easier than removing the original and cleaning everything up. I left it a bit oversized so I can file the ends and get the steering as far as possible without hitting the tank. After moving the tank forward and adding the larger forks, I'll need all I can get.

"A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils, and lunatics" George Fitch, 1916

1979 CB750F Tracker (maybe?)

Instagram

1979 CB750F Part Out

Offline Jimbonaut

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Re: 1979 CB750F Tracker (maybe?)
« Reply #145 on: Apr 08, 2019, 15:27:27 »
Damn that's a great looking muffler.  As the bishop said to the actress, before getting punched out cold.
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline jordandogtown

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Re: 1979 CB750F Tracker (maybe?)
« Reply #146 on: Apr 17, 2019, 13:05:08 »
Still fighting for time to work on the bike between everything else that's going on. It's getting to the point of waiting on a few final pieces before I can test everything before tearing down to paint.

The longer I looked at the swingarm the less optimistic I became with the adjustability. I intentionally left the mounting points bigger so I could find the range I wanted and then drill a few extra holes. I wasn't crazy about removing much material, so I opted for a sweet little adjustable linkage. It's plenty strong and offers dang near infinite height adjustments from Stock to -4" (for the CBR). The cool thing about this design is that one end is reverse threaded like a turnbuckle, so I can just loosen the locknuts and adjust the height without removing anything or lifting the bike. Super rad

Loosely assembled:


"A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils, and lunatics" George Fitch, 1916

1979 CB750F Tracker (maybe?)

Instagram

1979 CB750F Part Out

Offline jordandogtown

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Re: 1979 CB750F Tracker (maybe?)
« Reply #147 on: Apr 17, 2019, 13:14:06 »
I was also able to check off one pretty big box this week: Tars (/tär/ noun, derived from Hillbilly dialect meaning motorcycle "tires")

The original plan, scribbled on a napkin somewhere, called for dual sport/dirt track tires. The further I got through the project, it seemed like dirt track tires would be the only thing keeping this bike in the dirt track category. The more I thought about it, street tires just made more sense. Cheaper, more options in 17", better performance, etc. Although it is very likely this bike will see some farm road action, I ended up with the "smarter" choice and went with Pirelli Diablo Rosso IIIs (you don't want to know how close I was to full on race slicks  ;D )

We'll just agree to call this a "Street" Tracker for now on



The first look with the basic proportions and I couldn't have gotten any closer to my original vision. I'm finally starting to see some light at the end of the tunnel

« Last Edit: Apr 17, 2019, 13:16:02 by jordandogtown »
"A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils, and lunatics" George Fitch, 1916

1979 CB750F Tracker (maybe?)

Instagram

1979 CB750F Part Out

Offline canyoncarver

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Re: 1979 CB750F Tracker (maybe?)
« Reply #148 on: Apr 17, 2019, 14:22:32 »
Coming along nicely.

Offline cb250nproject

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Re: 1979 CB750F Tracker (maybe?)
« Reply #149 on: Apr 18, 2019, 04:47:47 »
This is looking bad ass


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first cafe build was an incomplete learning experience, more of a test run for the real thing FRANKENHONDA II