Pit Bike Conversion Help

[broiler]

Hi Guys! My first post here.

I’ve decided to build my first electric bike.
The frame as seen in the picture is from a pit bike (crf50?) type.

I’ve bought a 3kw Vevor kit with a 45A controller. I will be using my 60V20aH battery to start off with and invest in a better battery later on.

Have any one of you built on this frame and maybe have some input?
Tips for mounting the motor?
How do I best fit the battery?
What speed can I expect with this setup? My goal is to just have a fun bike to cruise around the neighborhood at like 30mph.

Thank you!
/ Sweden

 

[bananu7]

I really hope that it wasn't all spray-painted white, including the chain and the suspension components... that would be the second bike this week

One thing that comes to mind looking at this frame is that almost certainly the old engine was used as a stressed member here. This means you can't simply hang the new electric motor from it, you need structural support (sort of a bottom cradle) that will reinforce the bottom of the frame in lieu of the engine casting.

30mph is realistic from 45A @ 60V, just make sure you calculate the drivetrain gear reductions appropriately.