Don't know about "special", but a CroMotor can make about 10 hp peak with relative ease at a similar pack voltage to what OP is planning to run, getting about 75% efficiency while doing so:
https://endless-sphere.com/forums/viewtopic.php?f=30&t=43102&start=25#p998698
One thing I didn't consider(I was drunk when I typed that post) was that the CroMotor was made to fit into bicycle dropouts, so probably WOULDN'T be a good choice for this motorcycle. But it definitely has the power/torque needed to accelerate quickly and for the desired performance parameters, and is light at only 11 kg.
The same can be said for the Leafbike 1500W and below, it was made to fit into bicycle dropouts, but Leafbike does make a 2,000W version for scooters and motorcycles. In the massive thread on the Leafbike motor, there is hidden inside some dyno data, and the general consensus is that the 1500W version of the motor when run at 72V and modified with ferrofluid and hubsink is really a 3 kW continuous motor that can handle 10 kW peak electrically. The 2,000W Leafbike motor has significantly more copper mass and a wider stator width than the 1500W, and while I'd need to do some more research to confirm, it MIGHT fit into this motorcycle. Peak efficiency is about 91%. The Leafbike thread is below:
https://endless-sphere.com/forums/viewtopic.php?f=3&t=66489
As for the Astros, I was going by a combination of manufacturer's specs and what I've read on this forum. I haven't seen hard dyno data for them. There's been a number of impressive builds with these motors, the one that stood out to me most being recumpence's Astroflight powered KMX Typhoon that does 0-50 mph in about 4 seconds. All up that bike was what, 120 lbs?
https://www.youtube.com/watch?v=WKAMus3oSdw
These Astroflights aren't cheap though.
If budget is an overriding consideration, the OP really can't go wrong with an appropriately-selected QS motor either. It WILL do the job, but the motorcycle will end up a little bit heavier and perhaps a little bit less efficient. Small price to pay for ironclad reliability. A QS hubmotor for a scooter or a motorcycle application might be an easier install than the QS middrive and provide more low-end torque. The middrive will eliminate the unsprung weight and excess mass of the hub motor, at the sacrifice of the low-end torque but also probably not destroy things either. Finding a place to mount a QS mid drive with the battery taking up all of the space will be a challenge. But this is far from OP's first EV conversion, so he could probably handle the installation of a mid drive.
If the OP wants to cruise at a 60 mph top speed, he will definitely need a motor that won't overheat from the continuous power requirement this will impose, which on a motorcycle of this type, will be around 7-10 kW. But if he wants to cruise at 40 mph with brief bursts to 60 mph, many ebike motors will in theory work quite well, but again, they have to actually fit.
Another possibility is to put a hub motor in each wheel to prevent overheating.
My personal experience is only with the conversions I've built, which include a series-DC powered car, and use of a Leafbike 4T and Leafbike 3T in my custom e-trike/velomobile build.
larsb said:
I'm not sure you've got facts behind some of that. Sometimes i wonder if the oldtimers that used to post here sometimes were e-grinning too much - it was a time of enthusiasm, an 80100 was powerful and a 12070 was a colossus. Special firmwares were needed to run it! A cromotor was a unicorn. Astros ruled. Then most of it disappeared..
Speed up to today: The astros were dynoed to be a not so fantastic motor here a while ago. Cromotors were hyped but were they ever dynoed to be special?
Leaf motor on a moto? I'd guess the peak torque of that motor is more suited on a bike.
If you can back up your post with facts then i'd be happy to see them, cause i didn't see any way back then. Did you own and ride an astro, all qs mid drives, a cromotor and a leaf 3t and a hubmonster? How were they in comparison?