Is bigger better?

I get alot of emails daily about what big bore kit is best for the Z-125, or in some cases people who are 100% certain they want this engine kit but its clear its not really ideal for them.
Maybe its my fault for developing too many kits and as such i have decided to re-refine it a bit more in the next site update.

155cc is going to do alot for most people, it almost doubles the horsepower when used with all the right parts and offers great value for money.
No bottom end strip needed, no machining, no ecu remapping, this can be installed by almost anybody with a nice set of tools and a garage in a single afternoon.

164cc is exactly the same as the 155cc just with a 3mm stroker crank, its an odd engine kit that nobody but us offer, to some people the price difference and work involved doesnt seem worth it, but they are dead wrong.
This kit is without a doubt the ultimate kit for the stock case.
The torque is increased, the max rpm is increased and the vibrations are actually smoothed out thanks to the balanced CNC crank, this actually rides better than stock!.
Nobody has ever dyno'd this setup but i estimate 12-15bhp with a very smooth line.

155 and 164 are sold as complete kits, but thats only half the story, there is more power to be had from these small displacements.......
32mm throttlebodys raise the power everywhere from idle to redline.
Titainium valve kit gives a mild boost to the high rpm range.
Gearing kit allows you to acheive a higher top speed while still keeping the bottom end torque.

Like our Z-272 all the big bore kits use forged pistons and iron sleeved cylinders, overkill some might think, but i like over engineering, it allows me to sleep at night!.