professor
Active Member
The idea has been on my back burner for a long time.
The Sick bike kit is marvelous and it's usefulness prodded me on.
My bike would run a tad over 20 mph with the engine wound up on the governor. Seems crazy, but a single speed is stuck there. To go a reasonable speed with the motor at a fast idle is what I wanted. Now the engine fast idles in 3rd gear at (guessing) 15 mph. It will pull up the overpasses in third too. I love it.
A Sturmy Archer hub was on a bike I got, so I welded a scooter (#25chain) sprocket to the stock SA one (making the big one to not run-out much is a bear). Then welded a coaster brake sprocket on the other side (it fit pretty good- only had to grind off the little nubs on the inside. This one needs to be welded with small fast spots of weld to avoid buggering up the brg. race!
Four welds- let cool - four welds - let cool - four..... you get the idea.
A dial caliper is invaluable for centering sprockets and aligning them for welding
The shifting is strange.
With the power on, AT ALL, each upclick instantly shifts with a jump.
If you let off the throttle- it doesn't actually shift (after moving the little lever) until you add some power.
I don't want this thing slamming like a powershift on gear changes.
Just a little bit of throttle seems right.
It is not the set-up for bull in china shop drivers, I think it will break.
I want to mention how great it is to have an operational governor (am using a HF 79).
With the throttle drag increased to hold an engine speed ( I am using a derailer lever for a throttle and it has a drag adjustment) - you get to a hill and sudenly, you have cruise control - it automatically feeds in more throttle = speed maintained. If you pull in the clutch for some reason- the engine does NOT race- it just stays where the rpm was that you have. Cool.
On my little ride yesterday of 14 miles, without the 3 speed hub, I used about two cups of gas giving about 110 mpg. I think with the 3 speed, I can approach 200 mpg with the relaxed engine speed possible now.
Starting out is easier now too, as low gear is below the former drive ratio.
In the last pic u can see the left handlebar has the clutch (HT) lever, pedal chain gear selector and SA shift clicker.
Some pics:
The Sick bike kit is marvelous and it's usefulness prodded me on.
My bike would run a tad over 20 mph with the engine wound up on the governor. Seems crazy, but a single speed is stuck there. To go a reasonable speed with the motor at a fast idle is what I wanted. Now the engine fast idles in 3rd gear at (guessing) 15 mph. It will pull up the overpasses in third too. I love it.
A Sturmy Archer hub was on a bike I got, so I welded a scooter (#25chain) sprocket to the stock SA one (making the big one to not run-out much is a bear). Then welded a coaster brake sprocket on the other side (it fit pretty good- only had to grind off the little nubs on the inside. This one needs to be welded with small fast spots of weld to avoid buggering up the brg. race!
Four welds- let cool - four welds - let cool - four..... you get the idea.
A dial caliper is invaluable for centering sprockets and aligning them for welding
The shifting is strange.
With the power on, AT ALL, each upclick instantly shifts with a jump.
If you let off the throttle- it doesn't actually shift (after moving the little lever) until you add some power.
I don't want this thing slamming like a powershift on gear changes.
Just a little bit of throttle seems right.
It is not the set-up for bull in china shop drivers, I think it will break.
I want to mention how great it is to have an operational governor (am using a HF 79).
With the throttle drag increased to hold an engine speed ( I am using a derailer lever for a throttle and it has a drag adjustment) - you get to a hill and sudenly, you have cruise control - it automatically feeds in more throttle = speed maintained. If you pull in the clutch for some reason- the engine does NOT race- it just stays where the rpm was that you have. Cool.
On my little ride yesterday of 14 miles, without the 3 speed hub, I used about two cups of gas giving about 110 mpg. I think with the 3 speed, I can approach 200 mpg with the relaxed engine speed possible now.
Starting out is easier now too, as low gear is below the former drive ratio.
In the last pic u can see the left handlebar has the clutch (HT) lever, pedal chain gear selector and SA shift clicker.
Some pics: