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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