over rev causing the following issues

[let-it-rip]

I have a FZS 600, over revved it for a split second on the motorway (around 13,000) and since then the rev counter cycles through the following:
current revs
0
4,000
current revs

It goes through each stage after 3 second intervals. Also my headlight is on since I turned off the bike and the headlight switch.

Any ideas what I might have done? Bike still rides fine and sounds alright.

Thanks

[RhynoCZ]

That is odd, you can't possibly over rev an engine with working rev limiter.

Yes, you can over rev the engine, if you're stupid enough to down shift from 6th gear at high speed to the 1st one then let go of the clutch lever, but the engine would go bang.

It is so odd, I'm gonna go and play the: just a coincidence, card.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[jjdugen]

That is the Yamaha method of set-up reading. As I recall, the 4000rpm reading is for setting the TPS (throttle position sensor).
Might be that there is a problem with it.... or something else entirely unrelated.
____________________
The CBR900RR has been sold. Aprilia Falco worms its way into my heart.
Try Soi 23 on Amazon for a good read.... Self promotion? Moi?

[Copycat73]

its a fault code .. look it up in a manual .. if not google will be your friend ..
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Whatever I post I have no citation and no intention of providing one..
caveat emptor

[let-it-rip]

thanks, not sure why the headlight is stuck "on" but the 4k fault code is the speedo sensor fault code, strange it's only started now as my speedo broke ages ago. i have a replacement sensor already, will update tomorrow.

[MCN]

Just a quick fix/mibby no fix.

Switch on ignition. DO not start the engine.
Rol the throttle all the way to the max. and return to zero.

Switch off ignition.

This can reset the the zreo fuel point of the fuel emc if it has been disturbed.

Another one is to disconnect the positive lead from the battery.
Touch the Poz to the Neg.
This can drain any residual current in the electrickery.

May not work but in desperation mythery can help.

You do wear a 'functioning' St. Christopher?

edit: ps How did you over rev it?
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[let-it-rip]

nah it's all good, turns out I finally went over 10k revs which set off the sensor fault code:

[Copycat73]