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Project electric start

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A couple of months ago I bought a Service Honda Junior R from one of the members here. Service Honda makes special Honda conversions, among them the "Junior R" which is a CRF250R engine in a CRF150RB frame. I actually wanted the Junior X which is Service Honda's electric start model (CRF250X). I bought a 05 250X motor off eBay along with a wiring harness and some missing electrical components. After installing the engine I had to find locations for the electrical components like relays, rectifier, battery and starter solenoid. That was the toughest part. The rectifier is up under the front number plate but all other components had to be located in the sub frame. A  small Lithium battery is in the air box. Brackets I had to fabricate and the wiring harness was stripped and shortened or lengthened to the components locations. After all was done I gave it a test as seen in the video. What amazes me is how quick it started with the untested eBay motor. 

 

 

I still have to do some jetting as the Carb is a 40mm not the CRF250x's 37mm. Still.. this thing starts so fast you can hardly release the start button fast enough. I wonder if a battery powering the coil would make the 150RB start as fast ?

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1. ...After installing the engine I had to find locations for the electrical components like relays, rectifier, battery and starter solenoid. That was the toughest part. The rectifier is up under the front number plate but all other components had to be located in the sub frame. A  small Lithium battery is in the air box. Brackets I had to fabricate and the wiring harness was stripped and shortened or lengthened to the components locations....

 

2. I still have to do some jetting as the Carb is a 40mm not the CRF250x's 37mm. Still.. this thing starts so fast you can hardly release the start button fast enough. I wonder if a battery powering the coil would make the 150RB start as fast ?

 

1. Well done! Not a lot of space for anything extra on this bike. Very nice!

 

2. My RB starts on an easy kick or two, cold or hot, after improving the airflow over the pilot jet with an FMF Snap.

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That's good to know. I'm pretty small and light so kickstarting in awkward situations gave me fits. If I wasn't selling my CRF-150RB I'd have to give that a try. I've got no room for two dirt bikes.

 

BTW, In the video you can see my other CRF150RB in the background and the front wheel of my Suzuki DR650 or the right. I bought a Ecotrons EFI kit and installed it on my DR650. That was even a bigger project than this one. It took over a year to complete. You can see the progression of that project on my uTube site. https://www.youtube.com/channel/UCrOMKoi_b5HbOvO_IMqCESg

Edited by rcthirty

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