Good day all. I dropped a valve 3 years ago and decided recently to bring the bike back to life. Motor is back in, but doesnt start. Engine is turning over, pump is running high pressure and there is spark (starts when adding fuel to throttle bodies). It does not give me an error code or Fi light. I have unplugged a couple of sensors and some of them does not give an Fi light when ignition turned to on (maybe it is normal?) The ones mentioned include:
- cam positioning sensor (also swapped it as I have another one)
- fuel injector (one unplugged)
- stick coil (one unplugged)
- sub throttle valve
Unplugging the main throttle bodies plug does give Fi light.
I have read similar threads from the past, but nothing really matches my description.
Would really appreciate all comments.
First of, what did you do to "prep" the bike before letting it sit for 3 years?
First thing I'd be doing is flow testing all the injectors. That's an awfully long time to let fuel be sitting in the system. Lots of crap, water, debris, broken down fuel, etc sitting in those lines if you didn't drain and purge the system before letting it sit around.
Also, the above confuses me. There shouldn't be any spark to the plugs until the motor is actually turning. It has nothing to do with the fuel pump. So unless you've checked the spark plugs while the motor is turning over, then I'm not sure how else you could verify that.
Some sensors will cause an FI light, others won't. Unplugging an injector won't cause it. Neither will unplugging a coil. Crank sensor, cam position sensor, main throttle sensor, vehicle down sensor, etc. will though.
This sounds like a fueling issue more than anything. It's not getting fuel into the cylinders is my guess. Fuel pressure, good flow to the cylinders, even a compression/leak down check on the cylinders to be sure you don't have a leaking valve or a stuck ring or anything dropping the compression to the point it won't run would be the first things to check imo.