Masai DB pit bike conversion to electric QS120 v3

[KNO7]

Hello! I've been looking at other people's projects and thought I'd share my first electric moped project as well

So some parts and bike model information first
QS120 v3 motor kit with harness and controller etc
72V 25Ah Battery
frame is Masai DB 50cc (well known pit bike here)

and moped frame what i used is registered as a moped and plan is to get conversion inspection to an electric moped (or what ever it is in English)

In the third picture I made a cardboard model for the removable panel to make it easier to access the motor controller and wires
And also a removable panel for the battery case so that I can remove the battery from the moped if necessary

Atm waiting register plate light, rear swing, brake levers and other stuff to arrive..

I know that there is a lot that could have been done differently and better, but as a first project, at least I am satisfied with it

 

[harrisonpatm]

Looks good! Why don't you tell us about how it runs, what you like, what you might change after learning from your first project, ect... Speed, range, performance...

I'd also like to hear about the registration process for something like this in Finland.

 

[KNO7]

Thanks! and oh yeah true true, ehmm i haven't really had time to drive much yet but i drove to my friend's place and got around 50km on trip and still have like 40% battery capacity so i think the range is around 70-90 maybe.. make range test when i got rest parts on it!

Speed is atm with 13/41 sprockets 46-50 km/h so basically street legal speed what we have here
also i have 15/35 sprockets too but have to test them out too.

Have to say that its feels powerful with that gear ratio like instantly starts wheelie and accelerates really well and that what i looking for do some wheelie and not just going fast and what I learned from this project is "measure twice make once" I had to redo many parts because they didn't match..
and the battery case is a centimeter or two too far in front and catches the front fork, so the maneuverability of the moped decreased and thinking if i redo it again but don't know yet

And about special registration operation what i know is same process as with normal gasoline mopeds.
Here is a small list of what you need for that.

1. gear ratio must be original
2. The tires must have enough tread
3. The brakes must work
4. the frame must not be modified in such a way that it weakens the durability
5. The lights must work, as well as the turn signals, if they are attached to the bike
6. The maximum motor power must not exceed 4kw
7. the moped must have mirrors
8. All mandatory reflectors must be in place, including the red reflector under the license plate and side of front fork and rear swing

+Max speed need to be like 45 km/h. So there is something what to do but basically pretty easy job

Edit: and electricity must not create a fire risk..
so there must be the right connections for the wires or something

 

[harrisonpatm]

the frame must not be modified in such a way that it weakens the durability

How is this determined/judged?

 

[KNO7]

"If necessary, welding seams must be presented for inspection without surface treatment."

Like for example, if the moped has any support bars, they must not be removed or they must be replaced with new ones but you cant just remove them and i understood that it will be tested with something like the frame flexes in the test or something..
Im not sure about that so because of this I did not remove bikes own frame mounts

But I suspect that if it doesn't go through, then you should support the bike frame better and try inspection again