This page is devoted to increasing the power of my TZR250R V-twin 3XV to somewhere around (or maybe slightly higher) than what the factory would have given us if the bike was imported into this country.

As many of you will know, this is not straight forward. Having done many runs with it on my Dyno I have amassed much knowledge about the bike. Along the way I have found a lot of the information that I have read on the web over the years (even from Japan) seems not to be particularly accurate, and WITHOUT a good honest dyno graph.

The bike is a standard but tired 92’R (not SP etc). I am reluctant to rebuild the engine until it either gives up or I think I’ve got the power to the levels that I would like so a healthier engine will see another 4-6hp across all of these graphs. It is the improvements/losses over the standard hp curve that is of interest to us.

I also have managed to gain full control over the ignition curve. This has not been easy or straight forward, but it means that the ignition has ceased to become the limiting factor, and will give a good indication of the best that the bike will perform in each given set up. I also still have the variable air jet system still working, as I do not want to see ANY losses by the time I have finished this.

I must say at this point that I do have a “Race/Sugo” box but rejected it as it is only suitable for a bike which is tuned to race kit spec. The ignition curve is wrong, you have to modify the wiring, only one of the variable air jets fire and that’s not at the right time, the list goes on and on and on.

The system that I am using is a prototype set-up developed by Smartcom and myself, which will be available when I am confident that I can guarantee it will produce the power and reliability on your road bike without spending hrs on the dyno.