Author Topic: CB750 Desert Sled  (Read 1355 times)

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Offline wreckitralph34

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CB750 Desert Sled
« on: June 27, 2025, 10:41:17 PM »
Howdy,
I just finished V1 of my desert sled.

I started with a 1976 cb750 that had been sitting un covered in the desert for 20+ years. I knew this route would be a lot of work but I liked the idea of this bike getting back at the desert after all it’s gone through.

The engine wasn’t frozen but after draining the oil tank and engine case I found a lot of water inside. Ended up being ok after 3 oil changes.
The carbs were completely seized. I spent a week rebuilding them and they fought every step of the way.




After the engine fired up I moved onto the conversion. Found out the front end from a 00-07 xr650r is a direct bolt in with a cb750 tapered roller upgrade kit.






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Offline wreckitralph34

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Re: CB750 Desert Sled
« Reply #1 on: June 27, 2025, 10:53:45 PM »
Next I had to figure out how to adapt the xr swing arm to the stock frame with minimal work. I decided to retain the factory bolt, sleeve and washers/seals. Machine then and some spacers to work with the xr sleeves and it ended working perfect.









I did consider using a super sport rear swing arm and hub and just extend it but it was easier to source a xr setup and its lighter/stiffer.
I ultimately had to modify the machining and shift the entire swing arm to the left for proper sprocket alignment.


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Offline wreckitralph34

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Re: CB750 Desert Sled
« Reply #2 on: June 27, 2025, 11:02:50 PM »
For the rear suspension I decided to keep it dual shock since a mono would’ve pushed me out of the vintage class. I decided on using Atv front shocks off a raptor 660. I screwed up on my calculations and it ended up being way too tall and stiff but at least it didn’t bottom out during the race. With the event being days away I made some simple brackets and welded them to the swing arm. I also designed a bracket to hold the rear master cylinder off the xr and adapted it to the mechanical drum linkage. I’ll have to revisit it since I don’t have enough leverage to properly activate the rear brakes. Another thing I added was a lower roller to keep the chain from eating into the frame.








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Offline wreckitralph34

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Re: CB750 Desert Sled
« Reply #3 on: June 27, 2025, 11:08:10 PM »
Other thing not shown is I picked up a 17 tooth front sprocket and turned down the face of it I believe .100 - .120” to accept a 520 chain. I didn’t want to modify the rear setup to run a 530 since that would’ve caused more fab work.
With the xr front end it pushes the tank back and I wanted to run a 550 tank that I’ve had on the wall for 10 years. The petcock was now right above the carb so I modified the mount to get it back in front of the carb.



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Offline wreckitralph34

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Re: CB750 Desert Sled
« Reply #4 on: June 27, 2025, 11:27:59 PM »
After fighting electrical gremlins I had to hot wire the bike and do the finishing touches. She got new tires and tubes. I “finished” the bike at 8pm on Friday. Did a test ride on the street and then loaded her up to go racing.




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Offline wreckitralph34

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Re: CB750 Desert Sled
« Reply #5 on: June 27, 2025, 11:43:08 PM »
Here’s some of the pro photos from the race along with some from recent bike shows.
At the race I got to test the bike in the dirt for 5 mins. Then it was off to the starting line. When we were a few rows from starting my clutch broke. After pushing it back to the pits I found that I adjusted it wrong and it had popped past the cam lobe. I readjusted it and went off after everyone had started.
The race was the Biltwell 100 and I was in the adventure light novice class. We were supposed to do 3 laps (75 miles) but I had only completed 2 and timed out after 4 hours and 20 mins on course. I had crashed twice. The first time was pretty bad to where I thought I had broke my leg but it was just the mixture of the thigh being stabbed by the bar end and my shin smashing into the engine case. After about 20 mins on the side of the course I trucked along. The bike had no mechanical issues after the clutch incident which is impressive for how long it sat out in the desert.








On lap 2 I had switched to my white pants and t shirt. This is my favorite photo from the race.
Post race at the award ceremony
Both my Hondas on display at the Reunion Show in SoCal.



I had the privilege to have the bike on display at Born Free with other vintage desert sleds.
It’s fun seeing the different reactions from people.  Some look at it as a normal bike, others look at it in horror and just few are in love with it like myself and think it’s the coolest bike on the lot.

I left out a lot of info, if you have any questions just let me know and I can answer them or get you photos.

Hope you enjoyed. More upgrades coming soon for the next race.


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Online newday777

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Re: CB750 Desert Sled
« Reply #6 on: June 28, 2025, 02:44:59 AM »
Welcome aboard the forum from southern NH but I lived in Oceanside for a bit.
That is an interesting build, 🤔. It must have been a handful to handle the weight of it wasn't it in the dirt racing?
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline CycleRanger

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Re: CB750 Desert Sled
« Reply #7 on: June 28, 2025, 07:42:01 AM »
Howdy!
Great build, nice fab work, and a terrific story!  :)
Do you have a copy of the Honda Shop Manual or Parts List for your bike? Get one here:
https://www.honda4fun.com/materiale/documentazione-tecnica
CB750K5        '79 XL250s     CL350K3
CB750K3        '76 XS650      '76 CJ360T

Offline MauiK3

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Re: CB750 Desert Sled
« Reply #8 on: June 28, 2025, 07:44:22 AM »
An a bit loud too!
Very unusual and cool.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline scottly

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Re: CB750 Desert Sled
« Reply #9 on: June 28, 2025, 10:35:16 AM »
Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Offline wreckitralph34

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Re: CB750 Desert Sled
« Reply #10 on: June 29, 2025, 12:42:25 AM »
Welcome aboard the forum from southern NH but I lived in Oceanside for a bit.
That is an interesting build, . It must have been a handful to handle the weight of it wasn't it in the dirt racing?
Thanks man. I have another build posted in here under (cb550 hooligan).You can also see the bike in the reunion photo.
The 750 was surprisingly nimble and handled the desert very well. I was really shocked and this is coming from zero desert racing experience. Once I lower the bike and get proper rear shocks it should be even better.


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Offline wreckitralph34

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Re: CB750 Desert Sled
« Reply #11 on: June 29, 2025, 12:43:37 AM »
Howdy!
Great build, nice fab work, and a terrific story!  :)
Thanks man :D


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Offline wreckitralph34

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Re: CB750 Desert Sled
« Reply #12 on: June 29, 2025, 12:45:46 AM »
An a bit loud too!
Very unusual and cool.
Yeah I made sure to have it open header. I want everyone to hear it coming and know what it is.
Unusual yes but the Harley guys have been doing this with sportsters for awhile now. Need to have a Honda out there to keep them on their toes:)


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Offline wreckitralph34

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Re: CB750 Desert Sled
« Reply #13 on: June 29, 2025, 12:47:07 AM »
Bummed I didn’t make it into this video but it looks like they filmed it the day prior while I was still finishing the bike.


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Offline BenelliSEI

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Re: CB750 Desert Sled
« Reply #14 on: June 29, 2025, 05:25:08 AM »
Very cool. I love the ingenuity and determination! Congrats on a cool build.

Offline wreckitralph34

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Re: CB750 Desert Sled
« Reply #15 on: June 29, 2025, 10:52:58 AM »
Very cool. I love the ingenuity and determination! Congrats on a cool build.
Thanks man, I appreciate that


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Offline jgger

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Re: CB750 Desert Sled
« Reply #16 on: June 29, 2025, 11:56:29 AM »
Where is this event held? I played District 37 in the early 70's and this stuff is interesting to me.
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Offline scottly

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Re: CB750 Desert Sled
« Reply #17 on: June 29, 2025, 12:02:29 PM »
Near Ridgecrest.
Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Offline wreckitralph34

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CB750 Desert Sled
« Reply #18 on: June 29, 2025, 12:02:35 PM »
Where is this event held? I played District 37 in the early 70's and this stuff is interesting to me.
Biltwell 100 is held near Ridgecrest, CA. Usually beginning of April. You can find the details on their website. https://www.biltwellinc.com under the events section.
District 37 is still doing events.
Vintage desert racing is gaining popularity in general so I’ve noticed new events and even older ones being brought back.


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Offline scottly

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Re: CB750 Desert Sled
« Reply #19 on: June 29, 2025, 12:07:43 PM »
Once I lower the bike and get proper rear shocks it should be even better.


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What are you looking for in the way of shocks? What length?
Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Offline wreckitralph34

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Re: CB750 Desert Sled
« Reply #20 on: June 29, 2025, 12:09:55 PM »
Once I lower the bike and get proper rear shocks it should be even better.


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What are you looking for in the way of shocks? What length?
I’m looking for 12-14” eye to eye. It has 16” shocks right now.


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