Hey guys,


Bike shut off on me while I was riding it one day and I realised the fuel pump was not priming. I ended up taking it in to the shop and it took them 47 days to get a new fuel pump in assuming that was the issue. Turns out the bike still wouldn't start as the fuel pump wasn't priming. Ended up taking it to a Honda service centre and within 1 week they told me they had the bike running after testing a new fuel relay. I picked up the bike and it was running fine with the recent relay swap but then 2 days later I started it in the morning and it shut off 30 seconds into the idle. I tried starting it again and it wouldn't start but after a few more tried it started up.


I rode the bike alot for the next 2 days with no issues before it died on me again. It wouldn't start this time regardless of how I tried.


The first thing I did was disconnect and reconnect the relay that was just swapped with no luck. Tried unplugging the fuel pump and plugging that back in but still no luck. I bought a multimeter and. Tested the wires going to the fuel pump and it gave me a reading of 24V then went down slowly to 12V. I saw in a video that there should be a surge initially from that wire in order to prime the pump but I'm unsure of how much of a surge that should be.


Any thoughts? I'm losing my mind having been without my bike in 2 months of prime summer weather and missing out on the group rides. About to buy another 05 cbr600rr and swap the ECU to see if that works.


Please help

 

Have you tried bypassing the bank angle sensor? They can be intermittent like that and it's job is to cut the fuel pump.

 

Have not done this yet but will try this now and update with results.

 

So I after checking if the BAS was the issue I was looking at all the wires for a short. I took apart the harness and couldn't find anything except for a bit of corrosion on some of the plugs and relays. I decided to take out the relays and clean them again before swapping them around with each other.

Bike started! After swapping out the fuel shut off relay with the fan relay this time it worked but what is strange is that the bike was running when they swapped the relay out at Honda but then stopped again after 2 days.

Do you think this could be an issue stemming from the ECU?

 

I doubt it, they tend to work or not work but who knows. I've has the BAS issue with mine before, that's why I say to bypass it and see what happens. I have also seen wires burn in the back of the ecu connector and cause all kinds of intermittent running issues. These were all on 929s, but still worth checking on yours.