Fitted Kev�s latest O2 controller to the T�n�r� (when it was snowing a month ago) and have finally got a good few hundred miles riding in to evaluate things.

The bike already has the fuelling mod (set at 6) and DNA stage 2, which improved the flexibility of the motor hugely, broadening the spread of power, particularly in the lower revs on a wide throttle.


So what difference does the fitting the O2 controller on the Z (which doesn�t really suffer from the same surging issues of the R/X)? Well actually, quite a big difference � I was pleasantly surprised to say the least.

Most noticeable is the throttle response; snapping the throttle wide open (from a closed or small opening) at any speed is noticeably more smooth, linear and productive in terms of forward motion! Second is the fact it will now sit at a slow, leisurely cruise in traffic at say 2000-2500rpm without any sign of hunting � you can set the throttle position and the bike�s engine and road speed remain utterly constant. Fuel consumption, over just shy of 300 miles, appears to be identical to that before fitting the O2 controller (57mpg).

All in all, I�m well chuffed with the outcome (thanks Kev) � the T�n�r� is happier, both in traffic and out on the open road. Thoroughly recommend considering this mod whether you�re running a Kev mod or PC; more closely matched closed loop and open loop fuelling really does make a big difference.

Friend who scribbles for a well-known bike mag had a ride yesterday and said (I quote) � �That�s ****ing flexible for a single and keen to pick up off the throttle too � I really like it.�

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