CBR125 2007 Fuel Injection - Diganostics - CBR Forum - Enthusiast forums for Honda CBR Owners

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Old 03-11-2017, 01:40 PM
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Join Date: Nov 2011
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Default CBR125 2007 Fuel Injection - Diganostics

Hi Everyone. I'm looking for some assistance.

I've just bought a CBR125 for very little money and it will need some work doing.
When I got the bike, a lot of the electrics have been disconnected, the engine is loose in the frame and air box and throttle body wasn’t on very well, throttle cable was off, just to give you an idea of the condition.

For some reason the Fuel Injector cable into the throttle body had been cut, and the fuel pump from the CDI has also been grounded to the frame.

When the ignition is switched on, you immediately here the fuel pump prime, and continue to prime. If I disconnect this bypassed earth cable, it does not prime what so ever?

I have disconnected from the throttle body and we are getting good amount of fuel out.

Since owning the bike I have;

Drained the tank completely & filled with 10L of fuel.
Gone around and reconnected all plugs
Re-soldered Fuel Injector back together
Completely removed & stripped the throttle body, refitted snug with no air leaks
Tested / cleaned the injector and see it spray fuel for over 10 seconds.....

When switching the bike on I am getting 5 Long flashes, and 4 Short flashes, from what I understand this is code 54 - and related to the "Bank Angle Sensor" - Bingo, yes it is disconnected.....

What I find very strange is that there IS a spark despite the error, but as soon as I bridge the two outside connectors together I loose my spark (Reading up online and this should bypass it) I loose the spark, however the fault code goes on the dash?

I'm also not hearing the fuel injector solenoid kick in (although it is quiet) but when I manually bypass that too, it still does not fire? (Although can't control the flow....)

I have had two back fires through the exhaust

Why would a previous owner have bypassed the fuel pump?
Why would the CDI not switch the fuel pump on?
Why am I not hearing the fuel injector solenoid when I try to start it?
Why do I loose a spark when I bypass the Bank Angle Sensor?

I'm at this stage suspecting the CDI could be faulty but does anyone else have any suggestions first?
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