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Author Topic: 73 racer build  (Read 7924 times)

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Offline Moosey

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Re: 73 racer build
« Reply #25 on: October 17, 2014, 01:52:49 PM »
I have a 71 cb500 and am looking into getting comstars. I see you got yours off a 750a. Was a direct bolt in or did you have to change sproket, axle, spacer on the rear? I think I will have to use fork off of a costar bike for front (plan to keep older forks). Any input will be greatly appreciatd!!
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Offline Cougars750F0

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Re: 73 racer build
« Reply #26 on: October 17, 2014, 02:28:19 PM »
Quote from: Moosey on October 17, 2014, 01:52:49 PM
I have a 71 cb500 and am looking into getting comstars. I see you got yours off a 750a. Was a direct bolt in or did you have to change sproket, axle, spacer on the rear? I think I will have to use fork off of a costar bike for front (plan to keep older forks). Any input will be greatly appreciatd!!
Post to the Bikes & Parts wanted a lot of people prefer spokes on these old bikes if your spokes wheels are in good shape you may be able to trade. Here's the linkhttp://forums.sohc4.net/index.php?board=45.0
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1970 Honda / Yoshimura 810 with ported head, 1968  Honda CB450 5 speed European model, 1973  Triumph Bonneville 750 twin carburetor model, 1975 Honda 750F0 Super Sport, 1977 Honda 750A

Offline Jhelgesen

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Re: 73 racer build
« Reply #27 on: October 17, 2014, 04:13:33 PM »
The rear wheel was a bolt on with the 550 axle. Going to try fitting a disc brake wheel next, so we'll see if that fits.  I had to use the narrow sprocket carrier from a 750.  I'll need a new spacer on the right side if I don't use the disc brake.

Don't know about the front axle since I have the cbr front end. I did find a yamaha front axle that is the right diameter and may save me some machining.
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Offline Lostboy Steve

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Re: 73 racer build
« Reply #28 on: October 17, 2014, 06:34:27 PM »
That looks really sweet. So are you now going to have those adapters machined from aluminum?
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1968 Honda Z50
1977 Honda CB550K
2018 Indian Scout

Offline Jhelgesen

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Re: 73 racer build
« Reply #29 on: October 30, 2014, 07:07:26 AM »
Swapped the rear wheel to a 18"  750 sport disc brake wheel (instead of the 17" 750a drum brake wheel)  Lost 10mm in tire width, but I'll live. :D

Using a rear caliper from a 750 sport, and a GL1000 disc (same part number as 750).  I will need to narrow the caliper mount block to space the wheel correctly, take several mm off to center the wheel.



Front disc brake adapters arrived, fit perfect.  Need to make axle spacers now.  Found a yamaha front axle that was 15mm diameter, and longer than the CB, so I'll update my CAD for that one instead of making an axle from scratch.





Had to move the bike off the table for a bit while I work on another project, she has a pretty good stance.


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Offline SOHC4 Cafe Racer Fan

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Re: 73 racer build
« Reply #30 on: October 30, 2014, 05:14:14 PM »
The stance and the tank look good. 
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline Jhelgesen

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Re: 73 racer build
« Reply #31 on: November 25, 2014, 09:32:09 AM »
Finished the front axle spacers after some slight tweaking on the lathe.





Now moving to the back.

Ended up fitting a 750 sport rear arm on the bike, perfect fit on the 550, bolted right on.  Only issue is the wheel is a few mm off to the left, need to figure out how to space back right.

A big thank you to my lovely wife who surprised me with with a new drilled EBC rear rotor for the bike, so much nicer than the stock disc.



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Offline Jhelgesen

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Re: 73 racer build
« Reply #32 on: December 28, 2014, 04:04:20 PM »
Wasn't happy with the raised front of the cx500 tank, so I formed some skirts to reshape the lower section, and installed the cap assembly.

Before



After




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Offline Bankerdanny

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Re: 73 racer build
« Reply #33 on: December 29, 2014, 02:13:15 PM »
So they are purely cosmetic skirts, they didn't actually change the volume of the tank?
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"The problem with quotes on the Internet is that you never know if they're true" - Abraham Lincoln

Current: '76 CB750F. Previous:  '75 CB550F, 2007 Yamaha Vino 125 Scooter, '75 Harley FXE Superglide, '77 GL1000, '77 CB550k, '68 Suzuki K10 80, '68 Yamaha YR2, '69 BMW R69S, '71 Honda SL175, '02 Royal Enfield Bullet 500, '89 Yamaha FJ1200

Offline Jhelgesen

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Re: 73 racer build
« Reply #34 on: December 29, 2014, 05:03:37 PM »
They are just cosmetic, but they greatly increase the space under the tank to hide wires, electronics, a tool kit, and maybe a few days worth of provisions.
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Offline greenjeans

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Re: 73 racer build
« Reply #35 on: December 29, 2014, 05:16:04 PM »
Really like what you did with that tank.  Great solution.  can't wait to see this one back on the road.
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Yep, I'm the kid that figured out how to put things back together...eventually.
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