In my opinion and following the CIK rules kz1 and kz2 are the same engines. For example in the WSK Euro, the times between kz1 and kz2 are quite similar.
We can see it in the next links (Results of the qualifying in Wsk Euro Series at Zuera) :
http://www.wskarting.it/results/ES/2013/Round2/kz2_qualifyingpractice_90.pdf?update=7
http://www.wskarting.it/results/ES/2013/Round2/kz1_qualifyingpractice_88.pdf?update=7
However, in old times, there were huge differences between FSA and Inter-a, as now, between KF1 and KF2.
About the max rev in kz1/kz2 (not limit) i think is about 14.000-14.500 in a normal way, speaking of the top engines like: Tec Sav, Galiffa, or the own fabricants -speaking about Tm and Master too-. I have never seen an engine up to this revolutions with gas, but easily this rev go up when you are downshifting.
In order to the HP of the engines, I had heard that the best engines of Tec Sav are close to 50 hp.
We can see it in the next links (Results of the qualifying in Wsk Euro Series at Zuera) :
http://www.wskarting.it/results/ES/2013/Round2/kz2_qualifyingpractice_90.pdf?update=7
http://www.wskarting.it/results/ES/2013/Round2/kz1_qualifyingpractice_88.pdf?update=7
However, in old times, there were huge differences between FSA and Inter-a, as now, between KF1 and KF2.
About the max rev in kz1/kz2 (not limit) i think is about 14.000-14.500 in a normal way, speaking of the top engines like: Tec Sav, Galiffa, or the own fabricants -speaking about Tm and Master too-. I have never seen an engine up to this revolutions with gas, but easily this rev go up when you are downshifting.
In order to the HP of the engines, I had heard that the best engines of Tec Sav are close to 50 hp.


