Final plate shaped and welded on.
Reefed on it pretty good with a 12" adjustable wrench. Seems pretty solid. Would have liked more triangulation between the three mounting bolts, but it is what it is.
All back together for now. The footpeg bolts will get replaced with studs, anti-vibration washers and nuts. Would have liked to do that with the rear footpeg bracket bolt, but it would stick out too far.
Still to come is drilling the holes and welding studs in to attach the Heim joint plate. Then it can get painted in a flat black, and should pretty much "disappear".
Meantime, materials are starting to show up to build the other three mounts.
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Forgot to mention one important thing. Master cylinder clearance. Didn't want to add any complexity regarding servicing/replacing the rear master cylinder. Also wanted to ensure there is enough clearance so the plate doesn't flex into contact with the master cylinder. Hence the need to stack the three plates. Also puts the plates in tension with each other which helps limit flex, over using a single bent plate shaped to fit.
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@scott-h Hey Scott, are you thinking of building a similar plate on the left foot peg mount, and then running a connecting tube across to the one you just did on the right? Would probably really help with torsional stiffness along the axis parallel to the length of the bike frame.
Maybe not needed, but a thought.
@scott-h Hey Scott, are you thinking of building a similar plate on the left foot peg mount, and then running a connecting tube across to the one you just did on the right? Would probably really help with torsional stiffness along the axis parallel to the length of the bike frame.
Maybe not needed, but a thought.
That would have been a great way to do this. 👍 Could have the mount further back for better clearance around the heel area as well. It would require a different exhaust system eliminating the resonator that blocks this section under the bike. Otherwise it would require a big and ugly subframe assembly ruining the looks of the bike, and changing the handling when detaching the sidecar for two wheeled fun.
The section of frame where the bracket is attached has a through bolt motor mount, and just above is the swing arm pivot bolt. So the frame is pretty stout in this area. The way the bracket is welded mitigates flex along the X,Y & Z axes. It is a series of lap joints towards the middle of each piece. The weak point with this design is lateral twisting, because of the lack of triangulation of the mounting bolts. Using studs for the footpeg mount will allow a higher clamping force along the whole footpeg bracket mating surface. That is larger than it looks. Paws crossed it will be enough.
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Moving on to the upper rear mounting. This layout table is nice to work from. Both cutting out & cleaning up the brackets, as well as welding.
Shaped out the two brackets, and put the bends in to fit the off set lugs (one bracketfor each side).
The subframe on this bike is very stout, and fairly short, so it should provide a solid point for the upper rear bracket. Also keeps the rear strut out of the way of a passenger.
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Not much accomplished on this short day. Started on the upper bracket bag mounting loops. Just some 1/4" rod.
Still have one loop to make for the left bracket. Then more welding, finish sanding and paint for the left side.
Thinking about adding a helmet hook below the left loop (in picture above). Need to do some research to get ideas. A locking hook would be nice.
Right bracket still needs more fabrication to mount the Heim joint plate.
Hold my keyboard and watch this! 🙃
