Is a 50KW Out Runner motor any good for a retro street motorcycle?

That sounds interesting. I tried the SiA 200 link, but the language is all foreign & I don't know how to make it English. There was a price as well, but in a foreign currency. If I can get it translated, I'll add the data to my spreadsheet to see how it compares to the others I have looked at.
 
Near the top of the page is a dropdown to choose your location, language, money type, etc.

Or you can edit the link you use to point to the version that's in your language (that one goes to NL, or Netherlands).
 
While I was trying to find an English version of that page, I found a couple more candidates on AE:
This one looks to be similar in size & performance (144V, max 230nm) to the HyPer9 motor the guy with the Honda shaft drive used, just at a far lower cost of $1,273 + $126 shipping:

There's also this one, supposedly waterproof:
$1,082 + $226 shipping.
The page is hard to understand, apparently that price is just the motor, but it looks like they make a gearbox, controller, and display for it as well. The motor is rated at 5kw, 100nm, and operates on 48/60/72V. With the gearbox, they claim 180nm. It weighs a healthy 37kg or 81 pounds.
 
Near the top of the page is a dropdown to choose your location, language, money type, etc.

Or you can edit the link you use to point to the version that's in your language (that one goes to NL, or Netherlands).
Thanks. I see it now, $1,300 + $261 shipping. Looking at the below specs, if correct, this sounds about right for my needs. US link:

Info from that page (my notes in parens):
e.g. Electric Motorcycle

Vehicle weight: approx 190kg+150kg (418 + 330 pounds, my bike w/ ICE was 280kg)
Vehicle tire: Front 110/80-19 Tubeless Tire, Rear 160/60-17 Tubeless Tire (I have a 110/80-18 front and 160/70-17 rear)
Battery: 72V 8.6kWh
Gear ratio: 1:9.8 (Can't be right, I think the 1:2.5 below is correct)
Speed: 72V 140KPH (87 MPH)
Climbing: 30°@72V30KPH

Pls note that $1300/pc is CNC sample price.
More info:

Rated power: 12KW
Rated volts: 72
Rated torque: 19nm
Rated/peak RPM: 5,000/9,500 (H90 V3 is 7,000)
Controller current: 308A/385A
Reduction ratio: 1:2.5
Peak torque: 70nm (same as H90 V3)
Output shaft torque: 175nm (70 * 2.5, only slightly higher than the QS138 H90 V3)
Output shaft speed: 3,800 RPM (H90 V3 is 2,980)
Wheel torque: 610nm
Weight: 22.5kg (50 pounds)
 
I did some more reading about the SiA 200-50 and compared it to the QS138 H90 V3 and a 20KW 144V AC motor similar to the HyPer9 that I found on AE. The SiA looks to be the best choice at this time. It's the mid size and weight of the three, and makes more power than the 138. Plus, getting 144v out of a battery pack within my frame rails could be difficult. I looked at doing both 72 and 96v. I collected some specs:
Weight:
138: 14kg
200-50: 22.5kg
144V: Unknown, but more than 22kg

Rated volts:
138: 72
200-50: 72
144v: 144

Max Torque:
138: 168nm
200-50: 175nm (running this @ 96V this should be around 233nm, which is about what the Honda that inspired me had)
144v: 230nm

KW rating:
138: 4,000
200-50: 12,000
144v: 20,000

Rated RPM:
138: 4,800
200-50: 5,000
144v: 4,000

Max RPM:
138: 7,000 (2,980 shaft)
200-50: 9,500 (3,800 shaft)
144v: 6,500

Diameter:
138: 129mm
200-50: 200?
144v: 280mm (est)

Length:
138: 245mm
200-50: 262mm
144v: 370mm
 
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