Topic: CB750 Desert Sled

[wreckitralph34]

very cool, i'm building a similar toy but mine will be road registered

ive got a build thread going if you want to have a look

I checked it out. Looks good dude


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[wreckitralph34]

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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Did you ever find your new shocks?

I haven’t looked since I don’t know what length shock I’ll need for V2. I plan on moving the upper shock mounts forward for more travel. Still need to consult with the local shock companies as well since I’ll end up getting a custom set made.


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[wreckitralph34]

I love it! I've always considered a SOHC CB750 dirt bike... 

Thanks man. You should build one:)


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[wreckitralph34]

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.

If you re-positioned the shock mounts on the swing-arm further back it would lower the rear end as well as soften the spring rate and give a slightly progressive rate. Back in the last days of the twin shock moto bikes this was called "laying the shocks down" and was done by Honda, Suzuki, and Kawasaki trying to catch up with the Yamaha mono shocks. It was also done by guys on older bikes to increase the rear wheel travel: I was able to increase the rear wheel travel of a Kawasaki 100 from 4 inches to 6 inches by moving the upper shock mount forward and down.
If you find the length of your shocks when fully compressed, then position the rear wheel at the highest you ever want it to go, say before the tire hits the crossbar on the frame, this will give you an idea of where the mount needs to be.

That’s been the plan all along. Just didn’t have the time to do it. I’m going to cut off the rear diagonal bars that go from the upper shock mount and down to the rear engine/swing arm mount. Then I’ll replace it with a vertical bar and tie it back into the upper frame tubes. Then I’ll move the shock mounts forward to reinforce that. I still need to consult with some people to find the ideal upper shock location but that’s the general idea. I plan on running the Biltwell 100 again in April so I’ll try and get started on it this winter. I’ll keep this updated, you’ll love the next version of this thing.
Also if you have a instagram I keep that updated more frequently. @wreckitralph54


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[wreckitralph34]

Update: I recently raced the bike at the Moto Beach classic. I ended up crashing during the race. The bike is fine but I got pretty banged up and decided I’m going to let go of this project. If you’re interested it’s located next to Los Angeles and I currently have it listen for $3500



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[MauiK3]

I'm nominating your bike for Bike of the Month. You can go to the open nominations part on Bike of the Month and accept if you would like to accept the nomination.

[MauiK3]

Oh, and I need someone to second the nomination over there, any takers?
Thank you

[CycleRanger]

Oh, and I need someone to second the nomination over there, any takers?
Thank you

Oh heck yeah! Seconded!

Ralph, glad you're ok! Sorry to hear it's the end of your build for this bike.

[wreckitralph34]

Oh, and I need someone to second the nomination over there, any takers?
Thank you

Oh heck yeah! Seconded!

Ralph, glad you're ok! Sorry to hear it's the end of your build for this bike.

Thank you I appreciate it. Next owner can do the finishing touches now


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[rb550four]

   I  just found this thread today. Loved it. I had a similar notion that doing a similar project to a 550  using KZ suspension seemed like a good idea at the time . But the amount of weight falling on a rider when things go sideways was the deterrent for me , not that I haven't done unusual things to 550 s before, I'm afraid that I chickened out of that project with good reason since reading your last few posts.  It seems that very scenario may be the reason for your machine  being for sale. I hope that you are alright and will consider more projects  in the future . I really enjoyed your project , thank you for sharing.

[PeWe]

I second too!
A funtastic rebuild making something good of an old desert(ed) CB750.

The result looks like an old bike that was made that way from the very beginning

This can start a new era of old bike rebuilds making them functional for other kind of fun.
No shiny $$$$ stuff needed, functionality only.

[Stev-o]

Update: I recently raced the bike at the Moto Beach classic. I ended up crashing during the race.

Sorry to hear....