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Centauro not starting

L

LintnerDude

Just got it firing!
Joined
May 22, 2023
Messages
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Location
Virginia, USA
I'm having a hard time troubleshooting an issue that happened to the Centauro kept in my garage - a while back I went to exercise it (bi-weekly ride to keep fluids happy) and while it turned the motor over, it didn't have any signs of firing. I turned the ignition off, back on again and it started up. So I took it for a ride to a local bikes & breakfast, not thinking of a potential problem looming...When I tried to return home, it wouldn't start, leaving me with an Uber ride home to get my trailer. The ignition is working as there is spark on the plugs, so onto other things. No blown fuses and then I noticed the fuel pump wasn't initializing when the ignition was turned on. After a little more troubleshooting (I removed the fuel pump and hooked it up to a 12v DC bench power source) it showed signs of a bad spot on the motor, so I ordered a new one. I installed the new one, and same issue- not initializing so I'm thinking something in the fuel system, I don't think the injectors are working either because as I crank it, there's no smell of fuel out of the exhaust, but that could be from the fuel pump not running.

Any suggestions on where to look next? I looked at the schematic in the owners manual and it's not very detailed, especially if there are any sensors to check. It looks like one output form the ECU initializes the fuel side (fuel pump, injectors, electric petcock, etc) and the ignition so I'm assuming that is working since it has spark. I'm hoping maybe the hall effect sensor, but then the ignition seems to be working...So, any suggestions on where to check?
 
Doesn't anybody know Occam's Razor anymore?

When faced with multiple explanations for a phenomenon, the simplest explanation is likely the correct one.

The fuel pump is nearly 30 years old!
 
Typical of that model seen & fixed more that a few would be a faulty relay, clean pin connectors & or change out all of them. Just like said above. I would get better ones that are sealed from Dan in WI. Also check the store here, Todd may carry them.
To check, swap around relays of the same pin count & see if it works. Wouldn't hurt to clean ECU connector too.
 
scott_m said:
Doesn't anybody know Occam's Razor anymore?

When faced with multiple explanations for a phenomenon, the simplest explanation is likely the correct one.

The fuel pump is nearly 30 years old!
Click to expand...
I already replaced the fuel pump - wasn't it. But thanks! The fuel pump isn't initializing with the ignition turned on, and I do hear relays 'clicking' but based on the additional responses, I'll try swapping out the relays.
 
scott_m said:
Doesn't anybody know Occam's Razor anymore?

When faced with multiple explanations for a phenomenon, the simplest explanation is likely the correct one.

The fuel pump is nearly 30 years old!
Click to expand...
He installed a new fuel pump. Same problem persisted.
 
LintnerDude said:
I already replaced the fuel pump - wasn't it. But thanks! The fuel pump isn't initializing with the ignition turned on, and I do hear relays 'clicking' but based on the additional responses, I'll try swapping out the relays.
Click to expand...

You replaced with a OEM fuel pump or aftermarket cheapy?
 
As bikes get older and relays get pulled out and pushed back in, over time the female connectors inside the relay block can come loose and be pushed back to the rear of the block. Checking that all relay blades have made contact is easy by looking at the rear of the block and checking wire by wire. This happened to me just recently on my V11. Fuses and relays first!
 
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