Bombus Speedshop

Bombus Speedshop
Wrenchin' without supervision since the seventies...

Monday, April 25, 2016

Oil hoses

Time to route the oil hoses.
With my slightly wider custom frame and the cam cover mounted it's more than a challenge to reach the oilpump.
So with help from some friends we carefully put the bike on its side.
By doing this and raising the lift to a more comfortable height the work went so much easier.

The patient up on the surgery table ready for treatment

Rear struts

The fenderstruts must do their job better then ordinary struts.
They not only supports the fender they also acts as mounting brackets for the rear light assembly.
I went for the "Colorado" from Highsider.
Really neat little pieces combining rear light, brake light and indicators in a small package. Just 40mm in diameter.
And on top of that is that they are also E-marked, a requirement to pass SFRO inspection.
But to complicate things I of course choose just the inserts, not complete units so making the housings was up to me.

Some pipe was bought, just big enough to accommodate the inserts.
And then fabrication started.


First I made two "washers" that acts as mounting surface for the lights. 

All bits required including the just made washers
Made them just so big so they would fit inside the pipe
and then some more measurements before I welded them to the struts. 


Next up was trim the pipe that would act as housing. 

Also a ton of measurement and fine grinding before I could put them "over" and weld them over the washers already welded in place. 
Last fabrication was to fill the open part. 

But before I did that I gave the opening an angle that made it look more sleek and then I cut a suitable bit of sheet metal and welded it over the now open, angled part. 

The housing mounted and one of the angled

The opening welded and the light test fitted.


Then some black paint and then install the inserts with double sided tape before the went on the bike again. 

Thursday, April 14, 2016

Seat, the final

After a quick tour to the local upholstery shop Bullit Leather this little gem returned.
Really satisfied how it turned out.
The leather to cover the seat was a gift from my friend Viking Cycles.

The little black gem ready for Bombus Speedster

Looks nice together with the "stickerbomb" rear fender

Still looking good a step back




Seat, part two

Then some sort of device to secure the seat to the frame.
My choice was to use two hooks that went under the cross member in the front under the seat.
And in the back I use a kind of heavy duty "Velcro" from 3M called "Dual Lock™".
Next up was shaping, first bend the edges and then trimming the outline.
To simulate the thickness of the leather I put three layers of duct tape on the frame.
After that, the foam.
Glued the rebond foam to the pan, and then shaped it with a regular wood rasp.
Not the fastest way but with very much control unlike when you use something like a angle grinder.
And when I was satisfied with the shape I left it to Bullit Leather to cover it in black leather.
Bullit Leather is a local upholstery shop near my garage.
Always nice to support local businesses when possible.

The hooks to secure the seat in the front.

Glue the pieces of foam together on the pan.
Between the seat and frame I put three layers of Duct Tape to simulate the thickness of the leather

First some rough shaping with a knife

And the final result ready for the local upholstery shop, Bullit Leather.


Monday, April 4, 2016

Licence plate mount

One of those small easy to forget things that still is vital for the final build.
Some brainstorming and I went to action.
I took a bit of steel bar and some sheet metal.
Draw the outline of a licence plate, a LED light and a E-marked red reflector.
Both light and reflector are mandatory to be road legal.
After drawing the outline it just took a while with the angle grinder and file to get the plate mount ready.
Next up was the mounting bar.
Drilled a hole in one end and then bend the other end.
Some reinforcing in the bend and then weld the bar and the plate mount together, some paint, attach light/reflector and VIOLA!
The license plate mount was done.

The start pieces.


Some measurements, cuts and a bend later

Mockup with magnets to keep it together.
Still without the reinforcment welded in the bend.

Weld them together

And the final piece from the front with some black paint on.


And from rear without the licence plate but with blue tape instead to see the shape,
Haven't got the licence plate yet. It will take a while more until I´m there...