Bike turned off in Traffic

cjames431 · Nov 22, 2025

Uncle Phil said:
Spark at the plugs or are they wet from no fire?

Not sure, I need to pull them and check. I’m nervous about getting zapped while testing. Been there. Done that. No fun

cjames431 · Nov 22, 2025

Tried swapping out the ECU but that wasn’t it.

Uncle Phil · Nov 22, 2025

cjames431 said:
Not sure, I need to pull them and check. I’m nervous about getting zapped while testing. Been there. Done that. No fun

There are some testers for that sort of like a test light for checking regular electricity.
The lead plugs into them - pretty cheap.

https://www.harborfreight.com/in-li...0K6CxYRNDaMCL7p1Dd0bsR5H571-porBoCzzgQAvD_BwE

cjames431 · Jul 18, 2026

Pulled the plugs today and laid them one by one on the cylinder head. No spark. I don’t get a voltage reading at the coil either. Per the service manual I should read 12v at the coil.
Tested the fuel pump too. 60psi initially with an immediate drop to 45psi that holds.

There’s a little connector in the tail for the wire harness to both coils. If disconnected there’s no voltage. :think1:

I don’t remember disconnecting it.
No start

Ryan_B · Jul 19, 2026

cjames431 said:
Dropped into the saddle, pulled the clutch, kicked the side stand into place and shifted into gear. Silence ensued, as well as several more attempts to restart the bike.

That almost sounds like a bad kickstand switch. Does it restart in neutral and die immediately going into gear, every time?

If so, you should be able to temporarily bypass the kickstand switch by jumping the two wires at the connecter together. I would not recommend riding without the sensor though.

cjames431 · Jul 20, 2026

Ryan_B said:
That almost sounds like a bad kickstand switch. Does it restart in neutral and die immediately going into gear, every time?

If so, you should be able to temporarily bypass the kickstand switch by jumping the two wires at the connecter together. I would not recommend riding without the sensor though.

I haven’t been able to start the bike since the second event. I have a spare switch in the parts bin.

Ryan_B · Jul 20, 2026

cjames431 said:
I haven’t been able to start the bike since the second event. I have a spare switch in the parts bin.

Well, if it isn't starting in neutral (when the side switch is bypassed) then I doubt that is the problem, I would not mess with it.

Have you double checked your tip over switch? I always thought they killed the fuel pump, but it might control the coils? Any one know for sure?

cjames431 · Jul 20, 2026

Ryan_B said:
Well, if it isn't starting in neutral (when the side switch is bypassed) then I doubt that is the problem, I would not mess with it.

Have you double checked your tip over switch? I always thought they killed the fuel pump, but it might control the coils? Any one know for sure?

Tested already

cjames431 · Jul 29, 2026

SHE’S ALIVE!!! Changed out the fuel pump and after a few cranks she fired up!!
Huge thanks to @Igofar for helping diagnose. Give home a few symptoms and he’s nailing the problem every time.

dlfeather · Aug 18, 2026

I’m confused. You tested pump and got 60psi. What made you replace pump anyways. My 2004 st will not start and I am trying to diag it now.
Did you get oem pump?

cjames431 · Aug 19, 2026

dlfeather said:
I’m confused. You tested pump and got 60psi. What made you replace pump anyways. My 2004 st will not start and I am trying to diag it now.
Did you get oem pump?

@Igofar diagnosed the fuel pump. It would produce 60psi but the pressure would drop to 45psi immediately. The ECU not reading full pressure would not send a start signal.
I ordered a quantum pump and strainer. You also need the lower tank lid gasket and the two in tank hose pieces from Honda.