KX250E

El Gaucho

1 mW
Joined
Nov 9, 2021
Messages
15
I decided to document my dirt bike conversion. Lots of research and planning went into it so far. Here are photos of the journey
 

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Some pics of mounting the motor and machining the jackshaft to fit the 6 spline sprockets.
 

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Then fitting the battery into the frame. Some slight frame modifications were needed to get the battery to fit.
 

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Almost done! Currently waiting on the votol EM 260 controller and wiring harness
 

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Update! Finally got the 260 after waiting for 6+ months. It barely fits under the seat, with some plastics modifications. One thing to note is the Battery positive wire does not go to the B+ terminal on the controller, it goes to the red terminal! Kind of illogical, but it wont work if connected that that way. Anyways, as you can see, lighting has been added, street legal tires, etc. I am getting about 13 or so miles if I stay under 30mph. The thing rips.
 

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The battery positive should go to the battery positive terminal on the inverter, there should be a fuse from that terminal to the red terminal. Google search for images of the Votol EM260 and you'll see. Great job on the build.
 
speedy1984 said:
You cut the soul out of the frame holy moly :shock:
It was tough to get everything to fit! Just keep cutting until there is enough room, while still keeping most of the rigidity...

BTW 8.46:1 ratio so I get about 53mph before it cuts out(6000rpm)
 
El Gaucho said:
speedy1984 said:
You cut the soul out of the frame holy moly :shock:
It was tough to get everything to fit! Just keep cutting until there is enough room, while still keeping most of the rigidity...

BTW 8.46:1 ratio so I get about 53mph before it cuts out(6000rpm)

If you cut through the frame actually into the side sections leaving a hole there is not structural rigidity.
 
speedy1984 said:
El Gaucho said:
speedy1984 said:
You cut the soul out of the frame holy moly :shock:
It was tough to get everything to fit! Just keep cutting until there is enough room, while still keeping most of the rigidity...

BTW 8.46:1 ratio so I get about 53mph before it cuts out(6000rpm)

If you cut through the frame actually into the side sections leaving a hole there is not structural rigidity.
I would never jump that bike its gonna break in half.
 
rivvs said:
speedy1984 said:
El Gaucho said:
speedy1984 said:
You cut the soul out of the frame holy moly :shock:
It was tough to get everything to fit! Just keep cutting until there is enough room, while still keeping most of the rigidity...

BTW 8.46:1 ratio so I get about 53mph before it cuts out(6000rpm)

If you cut through the frame actually into the side sections leaving a hole there is not structural rigidity.
I would never jump that bike its gonna break in half.
Looking back on the pictures, there aren't any after I welded the holes closed. When I decided to start cutting I knew I would not be riding motocross or doing any serious jumping with it.
 
El Gaucho said:
rivvs said:
speedy1984 said:
El Gaucho said:
It was tough to get everything to fit! Just keep cutting until there is enough room, while still keeping most of the rigidity...

BTW 8.46:1 ratio so I get about 53mph before it cuts out(6000rpm)

If you cut through the frame actually into the side sections leaving a hole there is not structural rigidity.
I would never jump that bike its gonna break in half.
Looking back on the pictures, there aren't any after I welded the holes closed. When I decided to start cutting I knew I would not be riding motocross or doing any serious jumping with it.

If you welded the hole them its better.
 
Update: I made some changes. I scored 2 of those 47AH FOMOCO 12s batteries from BH last Fall. Basically the same size as the SPIMs but 3 times the capacity. I don't have photos, but I cut 2 of the series cells on each pack for 20s. So far they have worked a treat. Relaced the wheels. Replaced the 3D printed chain cover so the primary chain reduction is in an oil bath. And decided to rebuild the SPIM pack without the cell holders. Should have been smart enough to see how much more space they take up. Old was 8.875" x 5.875" x 15.25" New is 8.5" x 4.75" x 12". Probably would not have cut the frame if I did it that way the first time.😢
Finally get to enjoy some riding time!
 

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The controller is at 400 Amps x 84V (fully charged)=33,600kw. Plenty fast enough for me
 
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