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Useful information regarding Yamaha ECU Flashing options...

I get many questions regarding the various options available when flashing ECU's. In order to help make the correct choices for your motorcycle and setup have a read below.

If in doubt please get in touch, we are more than happy to help advise and explain the various configurations available, we can also make recommendations to get the best results for you


Disabling the exup valve:

The exup valve is a butterfly valve that is in the exhaust. Yamaha markets them as a midrange power enhancer. This is no longer true. When the exup valve was first used on the FZR1000 and on the early R1's it was true. Since 2004 with the R1, since its introduction on the R6 in 2006, and since the 2006 FZ1 it actually hurts low and buttom end power. It is strictly a way to get the bikes through noise emmisions. With the exup valve disabled you can remove it from the bike and it will not show an error code, nothing else to buy. You can also leave it on the bike as it will stay in the open position except on start up when it will still go through its normal open/close cycle.

Disabling the o2 sensor:

When the o2 sensor is active(small throttle openings and lower rpm's) the fuel injection uses the signal it sends out to keep the air/fuel ration in a narrow band. Usually around 14.5 to one. On some bikes like the MT09 this causes a bump in the throttle and surging as the bike switches back and forth between closed loop( o2 sensor active) and open loop(o2 sensor inactive). Disabling the o2 sensor allows me to control the fueling through all throttle positions across all rpm's and makes for a much smoother throttle.

Fan temps adjustment:

On most bikes yamaha waits till around 105 Degrees Celsius to turn the fans on. I recommend for the R1, R6, and MT09 to turn them on at 99 and off at 95. At these temperature settings the fans should never come on when you are moving but will come on shortly after comng to a stop. Not only does this make the bike more comfortable to ride it also keeps your motor cooler which should help enhance reliability.

Speedometer correction:

Most motorcycles have a 3-5% factory error built into them. Change sprockets and this error can becomes larger.

This will also add more miles on the speedo then you have actually ridden.

You can tell me the sprockets you have on your bike and I will correct the speedometer back to factory error.

Disabling the AIS valve:

The AIS valve injects clean air from the air box into the exhaust port. This is purely to clean up emissions and does not effect performance in any way. Disabling the AIS accomplishes two things.

It reduces popping on deceleration after installing an aftermarket exhaust and allows the exhaust to be analyzed for tuning reasons. A flash can not change over time so any time you have a change down the road it is not in the flash it is something on the bike changed. Most likely a leak at the AIS system or at the exhaust if it starts popping. Lastly crackles and small pops on deceleration are normal after installing an aftermarket exhaust .

Disabling Injector Decel cut:

With the injector decel cut active when you close the throttle the injectors shut completely off. Rolling the throttle back on results in a delay and then a bump as the injectors turn back on.

Disabling it smooths out on/off throttle response at slow speeds.

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