1989 Suzuki GP125 10kw ft QS3kw mid drive

[Kiza]

Primary designation: short commute and town runs
Power goals: 10kw constant

I'm not going for the original look with this bike as you can see, it will follow in the tracker style of motorcycles but with a modern look.
There will be no fuel tank and I want to keep as much of the space where the engine was empty for dramatic effect.
I hope to be able to achieve a reasonably small battery volume but still reasonable power by having a limited range.
Long range isn't required for the designation of this bike.

Latest img:

The current goal is to get the bike rolling on it's own power. Then I can focus on the aesthetics and ride-ability.

Brought this bike as a rolling chassis, it has beautiful lines. I've been commuting via ebike for about a year now but I need something with a little more power, and hopefully with less law complications.

 

[Kiza]

Cleaning up the frame and priming.

This was a mistake to do so early but I was keen to get started and I hadn't figured out the parts I was going to use yet.

Swingarm

Frame

 

[Kiza]

Motor bracket

Still planning on adding some horizontal bracing to the motor mount but it's fine for now. It's pretty strong.

 

[Kiza]

Reduction gear

With almost no fabrication experience this was by far the trickiest piece of work so far. And I'm not sure the current solution will last... I will probably have to rebuild the reduction gear in the future.

The current implementation is:
Thrust bearing
Sprocket
20mm spacer
Sprocket
Thrust bearing

The two sprockets are both welded to the spacer very poorly. Not sure why I had so much trouble welding those...
Everything is secured with a 10mm bolt through the middle.

I also think I'm using thrust bearings wrong and I probably need normal ball bearings as the spacer is currently sitting on the M10 bolt.

The 20mm spacer is required for my motor and rear wheel alignment.

Oh and then there's the whole placement of the reduction gear...
It's not in the ideal place and I know the chain will tighten as the suspension compresses but with where I mounted the motor I can't place the reduction gear at the ideal spot next to the swing-arm pivot point.

Any suggestions are welcome but I think for now I will try and go with the current implementation. Will see how it goes.

 

[Kiza]

So that's the current status of the bike, here's how it looks:

My next steps are to add the length of chain running to the back wheel and pickup some cells to hopefully get the motor spinning.