Topic: 1980 CB650 fuel injection project

[scott84]

Hey guys I just wanted to show off my project and start a log. The bike is a 1980 CB650C that I have owned for 8 years and it was my first street bike. I have always fought with carbs on this bike so naturally I want to upgrade to fuel injection. I know that there is a few guys out there with CB750's that have fuel injected them but I believe that I am the first to do a CB650. I already have a start on this project I have most of the components on hand or ordered at this point. I have a Speeduino NO2C on order to control this project, which is a small opensource ecm based off the arduino mega.

Here is the bike partly dissembled but you get the theme of the bike. It is mostly stock with a top end rebuild, mac 4-1 exhaust and the rear frame bobbed.


I plan to use modified throttle bodies off of a 2001 CBR600 F4i. These throttle bodies have the correct throat spacing for cylinders 1-2 and 3-4 but 2-3 does not line up. The spacing between 2-3 is 5mm to close the stock CBR600 throttle bodies need to be spaced out 5mm, obviously. The correct spacing is 75mm-80mm-75mm. Here is a picture of the stock throttle bodies.


In order to get these throttle bodies to work on the CB650 a 5mm spacer needs to added in between the throttle bodies. This picture shows a 5mm that I 3d printed for mock up. The final spacer will be turned out of aluminum.



The fuel rail, the spring connections for butterflies and idle rod need to be widened as well. I have the fuel rail spacer brazed on one side so that once the aluminum spacers are done I will have the correct spacing. I have also got the mount for the spring connection between the throttle bodies in the correct spot.



Here's some shots of the throttle bodies on the motor. I had to machine some aluminum bushings on lathe that press over the intake spigots on head so the CBR600 boots would fit.





I plan to use the swirl pot fuel pump from a Honda VT 1300 motorcycle.

[scunny]

looking on.

[SOHC4 Cafe Racer Fan]

I'm game to follow this.  I'd love to have EFI on my 650 motor.

What are you doing to increase the capacity of the charging system to power the EFI??

[scott84]

I'm game to follow this.  I'd love to have EFI on my 650 motor.

What are you doing to increase the capacity of the charging system to power the EFI??

I haven't quite worked that one out yet to be honest.  But I know it won't be stock. The flywheel on a banshee has the same taper as our 650's crank so I'll probably try to adapt that charging system to work.

Does anyone know the output of a stock CB650 stator?

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[scottly]

Does anyone know the output of a stock CB650 stator?

260W @ 5000 RPM, according to the shop manual.

[scott84]

Thanks for the info Scottly looks like my plan of putting a 200 watt PMA from a banshee is moving in the wrong direction. 

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[Gurp]

Following*

[scott84]

Well guys I'm making slow progress on this project because I've been waiting for materials and parts. But I've got some crucial pieces in so I can get back to work.

I received my ECM yesterday in the mail, and I was like a kid at Christmas excited to get it out and play with it. It is a speeduino NO2C which is small and and will do everything I need it to so it will work perfectly for my build. I went ahead and 3d printed a base for it to protect the PCB of the arduino mega while I work out the details of wiring up my connector. I will have to 3d print a case for it to work with the sumitomo 33pin ecm connector that old man Honda uses on his newer bikes. I have an ender 3 and plenty of CAD experience to design a case.

I went with the NO2C because it was the simplest and smallest DIY ECM I could find. I plan to run the injectors in batch fire, and the coils in wasted spark since the NO2C only has 2 ign and injector outputs. The NO2C also has the option to use a VR conditioner, which I hope to use the stock pickup with for my crank signal.

I also bought a 2010 honda shadow wiring harness on ebay. I am going to adapt it to work on the CB650 as it has all the wiring to run my sensors, weather proof connectors, and is in better shape than my original harness. Along with the harness I plan to retain some of the new bikes features, like the bank angle sensor and new style fuse box. I have also ordered the correct connector so that I can repin factory honda ecm connector and use it with the NO2C.

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[Gurp]

Very interesting

[02z06dave]

Very cool. I used to have a cb750f that had been converted to efi. I didn't do the conversion, but i believe it was documented on here by the guy that did it. It was a pretty cool bike, very different. Its one of those bikes that I sold too cheap and wish now that I had just kept it.

[ratranger]

I have an XS650 I converted to efi.  The banshee 200w PMA makes enough juice to run it.  I would recommend using the biggest AGM battery you can if the charging system is weak at idle.  But mine charges at 14v while I'm moving and drops to 13.4 after start when the battery is a little low. 

[Mantree]

I am definitely interested.  have you made any moves on this in the last year?

[SOHC4 Cafe Racer Fan]

Hoping this is still "in the works."

[grcamna2]

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