This just became my newest most favorite thing ever!

 

I was just asking a couple weeks back if anyone was doing monoshock projects. I'll keep tabs on this build. That rear end is burly!

 

I'll be interested to see how you connect the rear seat subframe stays and support the outside of the swing arm pivot bolt.

do you plan to tie swingarm outer mounts into the spine as well as the seat stays? will you use plate or round tubes?

more pics will be great!

 

Not sure yet on the rear down tubes, but it'll need to be bent around to clear the swingarm. Then the rear sets will need to be positioned and bracket made to hold them.
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Took the engine apart to clean it a bit. Put the cases, cylinder & head back together to check sprocket alignment.

Here's some pics of the engine






Engine back in frame (temporarily)




Waiting on the rear sprocket. Then I can start to look at how to align them. Rough measurement is about 3/4" offset from one sprocket to the other.

 

This looks like a really interesting project and I'll be sure to keep an eye on this one.

 

Loving the bike so far, what all did you need to do to put that swing arm on, any spacers needed?

 

Spacers will be needed (have the material machined & bored to the right diameters already).
Have a friend who's a design/structural engineer. He's interested in the project. I'll see what thinks of about outboard supports (may fab & install them anyway... overkill is my friend )

 

Would you mind sharing the dimensions on the spacers, thinking of doing the same when i build my cafe inthe next year or so

 

Be glad to share any info.

OD - 1.250" (31.75mm)
ID - 0.783" (19.90mm)

Here's a pic just after removing the live center. Once I know the size for each side I'll cut them to spec.

 

Should have mentioned the stock bushings were removed (heated the frame with a propane torch and used a brass drift to work them out). Put them on the lathe and opened them up, then pressed them back in.

 

Must say amazing work, how much did you open up the bushings

 

0.232" was the difference (from 0.550" to 0.783")

 

I'm in...

 

Haven't done much on this during the summer. Been looking and collecting some parts.
Plan is to go with LED's .

Here's what I got.

LED Headlight. This unit is from the UK. Very, very bright. One beam for low, the two other LED's come on for high. The center light is a "parking light".


These are good turn signals, but weren't as bright as I thought they'd be.


I'm going with these. Very bright, from the front and sideways. Got them out of Amazon.


Thought about mounting these up front as supplemental lights. I'm glad I only paid $4 for them. Poorly made... won't be using them.


Visibility is important, so these LED fog lights will be mounted up front. They're only about 1" dia. Super bright! Got them on Ebay


Probably use the 4-way flasher switch on the GSXR controls for a light switch. The passing switch (momentary), will be for the strobe. This will flash the turn signals & fog lights through a preset pattern. Should get "their" attention


Cardboard mock-up of the battery. Rectifier/regular (Thanks Sonreir)


Brake light flasher unit. Used these before. Works well.


Going with a GPS speedo. This one is from SpeedHut (modified so the tach is the larger gauge.


Horns... left is one off an ST1300, right an aftermarket. Will probably go with the ST (smaller, just as loud)


I like gauges... One on left is a typical 52mm/2". the right one is NLA, made back in the 70's. Its an Autogauge 1 1/2"


Need to do some machining, but It'll fit where the GSXR switch use to be.


Not sure how yet, but I'd like to have a hydraulic clutch. More on this later...


Relocated the front mounting tabs for the gas tank


1970 CB350 tank. Still need to fab the rear mount.


Working on the rear swingarm. Fab'd up some brackets. Much more to do.


Progress will be slow, but still hoping to have it done for May/June 2014.

 

right on! digging all the work going into this so far. I hope you like wiring because you got lots of stuff going on

 

This is seriously an impressive build. Can't wait to see the final product

 

Thanks guys

The rear "tailbone" of the frame will support the mono-shock lower pivot arm. A couple of steel plates will re-enforce the area. It'll also support the swingarm pivot.

Here's a shot lining up the plates. They'll be plug welded for positioning. Final welding will be with a tig welder.




Decided to switch lifts. This one gets the frame off the ground higher (knees aren't what they use to be)


Was going to fab & tack in the tabs for the steering stops, but noticed if I installed a longer bolt on the steering damper it made the perfect stop, lock to lock.

I'll fab a longer spacer, and maybe a slightly shorter bolt.


Same clearance side to side


Fab'd & tacked in the rear tank mount

 

You might want to consider welding the joint seam of the back bone to strengthen the frame.

 

Thanks Jim. Forgot to mention it, but the seams will be welded also.

Need to work on the offset sprocket, finalize the swingarm position, then fab a couple of spacer/bushings. Once that's done the upper shock mount can be located. Much more to do

 

I'll be making up a different seat frame, so the old one had to go. Was surprised how much it weighed.


Plans are to not go with outer supports for the swingarm pivot. Which means I'll need to re-enforce the frame. Made up this piece which slides into the frame. Note the addition of the 1" pieces. The "support tube" is contoured so it mates with the pivot tube.


Shaft inserted and welded in place


Top tacked in place


Remember those 1" pieces on the shaft. Added them to give more support when these bolts are tightened down. Will finish tightening them after frame seams are welded. Cut them off flush with the frame and weld em in.


Playing around with options

 

more pics

Rear lower shock mounts positioned & tacked in


The position & geometry of the swingarm linkage & shock is really close to the '00 CBR600. I originally thought it would attach closer to the center frame section. This also gives room for the carburetor air filters.


Next, need to make two spacers for the swingarm so it stays in place (side to side). The '99 & '00 CBR600 swingarm has a fixed bearing set on the right and a float set on the left. Will need to shorten the pivot bolt & cut new threads (M22 x 1.5)

 

Machined the swingarm pivot spacers/bushings.

Right side


Left side. Section of pipe is spacer to tighten shaft (waiting on 22mm die to cut shaft & re-thread)


Cross bracing tacked in place

 

All I can say is wow!!!! this one is bookmarked for sure!!!!

 

Thanks

Spent the better part of the day having breakfast with other retirees, exchanging welding tanks, getting misc steel & visiting friends at the Honda dealer.

Did get some time to finish up the shock bracing on the frame. Hoping to have it ready for Scott to tig weld by next Wednesday.

 

Made up a tail section. Not sure about it, so I'll sleep on it.






Another option is to cut the rear section of a CB175 tank. We'll see...