Like many of you I am an AC20 fan,

However I saw the Ac23 motor from HPEVs (more torque, but lower base speed), I was thinking it might pose some advantages in terms of the rear-front sprocket gearing. I run a Ac20 with 12:60 ratio and I'm a little nervous about such a small front sprocket (but i like the ratio at 100Nm of motor torque), if i used a Ac23 i could gear 4:1 or even 3:1. It also might help folks with issues in sprocket to swingarm clearance.

power graphs here

http://hpevs.com/catalog-ac-20.htm

Finally does anyone have any experiences with the oil cooled marine motors from HPEVs?

http://hpevs.com/oil-cooled-drive-systems.htm