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Discussion in 'Some Assembly Required' started by tobiism, May 26, 2016.
Starting on adjustable height double shear lower shock mounts
You're not just changing the height, you're changing the shock angle.
Was any math done regarding the effective spring rate at each position?
Nope, not even a little bit. I'm going with what looks good to my eye lol. I don't even have any idea if these Springs will work. I'm going to have the front and rear done by the local suspension guys when the bike is at full weight and ride height that works for me
I love the look of the multi hole lower shock mounts, but I would have done a couple things different
-left more meat between holes
-cut the seam of the tube out when I made the piece.
All good points! I didn't even think about cutting out the seam! All I was concerned about was making sure it didn't interfere with the holes I was drilling. Sometimes that seam can make your drill bit wander when drilling through. Well it didn't take me that long to make maybe I'll make a second set.
As far as the meat between the holes I thought about that but I didn't want the space between the adjustment holes to be too far. We will see how it holds up.
my general "rule" is to make sure the fasteners flat washer OD is on solid metal and not covering a hole. just something to think about.
It keeps looking better.
Well she has finally left the garage supporting her own weight. I decided to go with a single shock mount that is double shear. The shock mount will get boxed in a little more this is just preliminary stage. I will be removing the stock upper shock mount bolts and fabricating a double Shear top mount as well. Wheelbase is 64 in
Man, that sure looks good. Lean and mean.
And you're going to love that long wheelbase when you hit a big hill. Up or down.
So Ive been seeing these double sheer mounts now on the baja sportsters biltwell and carducci- also the original SC3 has lower double sheer mounts. This kinda concerns me for my single mounts on the swingarm especially now with 17.5" rear shocks. Im no engineer and my swingarm was done by a pro shop that does land speed bikes and Im not going to be motocrossing the thing yet it does kinda concern me. Have you looked into this much?
I've been talking with Bill as they were building the frijole 883 biltwell racer and double Shear definitely seems to be the way to go.
Well I've gotten a lot of work done on the bike since last time. The original frame I built for this had some fabrication that I wasn't too happy with in the rear so I tore it down and rebuilt it the way I wanted it. The upper front half of the frame still needs additional bracing in the neck, backbone, downtube area. Finished the oil tank today. It is mounted with rubber isolation mounts as will the gas tank.
The headlight is just thrown on there for shitz and Giggles. What I will actually have up there is a veetical fork mounted oil cooler and 2x 3" LED projection lights.
You have a lot of point load in the middle of the swingarm where the shocks mount, are you planning to reinforce it?
I think you must be, when you do the steering tube to down tube and top tube and other parts of the frame.
Depending on how hard you ride it offroad, it might be a problem.
I'm glad you moved the shock mounts forward, that will help balance the travel front and rear.
I've wanted to build a dual sportster for many years but decided the only part I would use from the sportster would be the engine.
So your build is very much what I would have built so I enjoy following along.
I have been kicking around ideas on how to reinforce the swingarm. I had thought about a long shock mount that spans about 5in of the swingarm. I'm glad you brought it up because I probably will do it.
Decided to do a high mount two into one exhaust
Progress is still ongoing. Here is the brake caliper bracket I made for the Nissin caliper I'll be using.
Tools used were a router(with rounding and straight bits) , portaband, drill press, and files.
Last thing I need to do to it is get another router bit with a rounded end so I can machine out the stress riser at the transition.
Lengthened the swingarm another 2 in because it just wasn't going to have great travel numbers. So now it's lengthned 3" total and I think I should get about 8 to 9" of travel. Maybe haha. Holy crap I can't wait to get this thing into the suspension shop and get everything tuned and on the trail. After the chassis is finished up I will yank the engine and get the cams reinstalled and I'm thinking about the @rekluse_motorsports auto clutch setup. This big heavy bike would definitely benefit from not having to worry about stalling at low speeds.
Got the new double Shear lower shock mounts made to help spread the load along swing arm.