2023 Honda CRF250R with QS138 70H V3 Motor and EM260S Controller

[DonCox]

Motocross Action Magazine on Instagram: "Check out this Electric bike conversion⚡️. @jax_krahenbuhl had his Honda CRF250 turned into an E-bike🔌 thanks to Don Cox and @electro_and_co and he rode it for the first time at @glenhelenraceway yesterday."

7,882 likes, 207 comments - motocrossactionmag on September 13, 2023: "Check out this Electric bike conversion⚡️. @jax_krahenbuhl had his Honda CRF250 turned into a..."

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3 monthes ago I was riding at Cahuilla Creek Mx track on Bob Casper's Honda Ebike 2010 250 CRF with the same motor /Controller on it. I came in and Bob was talking to Brock. Brock wanted his son to try this ebike and Bob was ok with that. His kid ripped on it. He came in and said Dad I want one of these. They had some other ebike on order. They already had some Surrons. He had a season of moto on his 2023 CRF250R and was getting a new one. He called me a couple weeks after that day at Cahuilla, and we negotiated the build. I picked up the CRF on July 1 , motor and stuff removed. I had started the ElectroandCompany.com kit order already, and when I got the bike we got started. 3 Weeks ago I had it running with a test battery. Yesterday we were at Glen Helen riding. I'd like to thank Austin at E&C.com, Derek Timm at Lithium-King.com, Mark here in Lake Havasu City for a lot of help on the Battery. And I better thank my wife for all the time I have spent on this project, because she has put up with me supposed to being retired and working 8-10 hour days on this. ( I washed the windows today to win some brownie points)
Here are some pictures of the build . The bike weighed 143lbs as a donor bike, and when it was done it is 226lbs.. If you have any questions I have a lot more pics, I hope I can explain it with Pics.
Here is a test ride, and there are other on my YouTube channel

 

[SubSonic]

Bike looks Good 2025 -
is front part of the lower motor mount bracket there to add back rigidity
lost when removing the stock motor ?

 

[DonCox]

I usually mount the motor with 3 points, the swing arm bolt, and the 2 sets of mounts at the bottom of the motor. So I just ran the mount to the front since the middle bottom bolts only go to the plate. These little motors put out some really awesome torque. I would rather be on the side of too solid than not enough. Check out the new battery test on the YZ250 The torque brings the front end up any time in mode 3(Sport Mode)

 

[Bob Casper]

I was at GH on pick up day. Bike looks and runs awesome. Good job Don.

 

[bayodome]

Awesome work Don!

I finally got to take my conversion out to a real motocross track this weekend and was very pleased with the result. Brought my identically prepped 2015 YZ250F as well for back to back comparison. In Map 3 (350a) I'd say the ebike is just a hair off of the four-stroke power. But I was able to do every jump and obstacle just as I did on the ICE bike. Once you get the new EM260S controller all figured out, I'd love to hear how it performs.

Love these conversions! Thanks so much for helping with mine!

 

[DonCox]

Your conversion looks really good. The battery is such a difficult part of every build. Also since every build seems to be in a different frame.
Im looking at the battery you used, as a solution, they build a great battery. Fusible links, the right cells and quantity, they disable discharge BMS Control. A size that will fit both the YZ250F like yours and I think it would fit in the new Honda CRF. This guy I built it for might want a quick change battery, I think I could do it with the Chi Battery.

 

[bayodome]

Your conversion looks really good. The battery is such a difficult part of every build. Also since every build seems to be in a different frame.
Im looking at the battery you used, as a solution, they build a great battery. Fusible links, the right cells and quantity, they disable discharge BMS Control. A size that will fit both the YZ250F like yours and I think it would fit in the new Honda CRF. This guy I built it for might want a quick change battery, I think I could do it with the Chi Battery.

Thanks Don! It's a pretty small form factor for sure (especially considering the power output and ah), compared to many of the other batteries I've seen. It would've been too tall in the regular design though, so I ordered mine without any display. That shaved about 1.5 inches off the top.

It's perfectly setup up for quick change too. As it is, it would take me about 3 minutes to completely swap to a new battery. Pretty much just have to remove the seat.

 

[DonCox]

Thanks Don! It's a pretty small form factor for sure (especially considering the power output and ah), compared to many of the other batteries I've seen. It would've been too tall in the regular design though, so I ordered mine without any display. That shaved about 1.5 inches off the top.

It's perfectly setup up for quick change too. As it is, it would take me about 3 minutes to completely swap to a new battery. Pretty much just have to remove the seat.

I don't know if you noticed the Boost button on my YZ250F at Glen Helen, the most recent one, but it is the Sport mode or Mode 3 put onto an easy to hit on and off on the left side. I was able to hit when needed. Bob and I were neck and neck all around the REM track, I came out a turn with Bob slightly ahead, Hit the Boost button and drove right by him. My Boost button goes from 300A to 400A. Then off for the rest of the track. If you have E&C send me another regular ON/OFF, 3 Mode Switch I will rewire it with the same setup. Kind of a Push to Pass switch. Have E&C make note of who is sending the switch on or in the package.