Error code yamaha r6 2007 51 how can i erase it?

You have a CDI (Capacitor Discharge Ignition) unit that needs replacing.

F21 (or E21) normally indicates a fault with the motor or the main control board.

Try erasing the stored codes first, in case it's a spurious fault



Turn the knob to off.

Close the door.

Turn the knob to 6 o'clock position.

Wait 2 seconds.

The start/pause should begin flashing.

Press and hold the spin button.

Turn the knob to 7 o'clock position.

Wait 2 seconds.

Release the button.

Turn the knob to off.



This should erase the error code and get you running again.



If the error code returns, you have a problem with the motor (most likely carbon brushes), wiring or main control.



If the machine won't go into diagnostics to erase the error code, it would suggest a faulty control board.



Try it several times to see if you get it reset.

If the start button doesn't flash, just carry on trying to erase the codes.

Sounds like the starter motor itself. Does the engine turn at all when you try to crank it?

you can disconnect the battery to clear the codes. If I remember correctly the code 40 is indicating an open injector circuit. You might want to check that area as well as the service manual for more detail

cud mean a # of things-this cyber age is not olscool n easy--buy a repair book from fixya or market

If the engine won't fire so to speak, it is either fuel starvation or an electrical problem stopping the spark plug from igniting the fuel.
If investigating these is beyon your knowledge base, you will need to take your bike to a motor bike repair shop.

Graham (TDR Fan)