S2r 800 starting already even without pressing starter button

[eyemd]

Hi, my s2r800 starts immediately  after i turn the key on even if i dont push the starter button yet. what seems to be the problem? TIA. didnt wash the bike or run through rain.

[Ddan]

IS the switch stuck in?

[eyemd]

IS the switch stuck in?

nope the switch is not stuck in.

[Ddan]

nope the switch is not stuck in.

The starter solenoid must be stuck, tapping it may get it to open.

[ducpainter]

On some of the newer bikes the ecu controls the cranking.

Not sure if the S2R is one of them.

[Howie]

disconnect the small wires on the back of the solenoid.  If the bike still cranks the solenoid is stuck.  Smacking it may unstick it, but it will likely stick again down the road.  If it now does not crank your problem lies in the control circuit, most likely the switch.  The switch is an input to the computer.  Follow the wires down and disconnect.  No longer cranks?  Switch or wires from switch.  Still cranks?  It ain't the switch.  Start checking wiring.  It is possible, but unlikely the computer is at fault.  If both the solenoid and switch test good post back up and I will see if I can figure out which pins to check going in and out of the computer.

[eyemd]

thanks guys will try tapping the solenoid and check the wires. will post updates

[xcaptainxbloodx]

try unplugging the right hand switch (separate from anything else you would do to diagnose).

the button itself may not be stuck but the switch may be bad.

[ducatiz]

S2R has ecu control starting. 

The switch just tells the ECU to run the start cycle.  If the switch is stuck, then it will start when you turn the key as you said but it doesn't hurt the bike after that, the ECU just ignores the closed circuit.

[corey]

yea, sounds convenient to me.

[Speeddog]

If the solenoid was stuck, it would crank no matter what, even with the key off.
The solenoid power wires are hardwired to the battery.

Either the starter button is stuck or compromised, the wiring between it and the ECU (or between the ECU and the solenoid) is compromised, or that output channel of your ECU is damaged.

You can wire directly from the starter button to the solenoid, cutting the ECU out of the loop.
Be aware that you then lose all of the associated safety features, like the ECU preventing you from starting the bike in gear with the clutch out.