Quote: Originally Posted by
Hayabusa 
Most jest are interchangeable. I knew that ZEX jets only fit ZEX kits, but I didnt know that there were other companys that did this.
Anyways the 21 size jet is the size of the hole so yes they are the same as far as jetting goes. You just need to make sure you get the right jets to fit your kit. What is different is that at least ZEX rates the power at the crank from a certain size jet. All other companys rate the power at the wheels. So when we say its safe to run a 75 shot we mean it is safe to run a 75 hp shot at the wheels. Just make sure you get a jet that fits your kit, and also make sure you use a calculator to choose you jet sizes. There are hundreds out there.
Hayabusa
I was under the impression that NX jets could be used in a Zex nozzle. I could be wrong though.
