Jet Kit for GX340 GX390 and Predator 420cc

comes with numbered jets 41 & 42. I used the 41 jet and engine runs fine with original air cleaner. Back story- I had over enlarged my original jet to 1/16 inch (my smallest drill bit size) which made the engine run rough at any speed over idle.

These work for a 301cc predator also if anybody is looking for jets for it, #41 fits mine perfect, it has and I take kit one it and it helps reduce pops out of the aftermarket exhaust.

Love it.. works perfectly

Try to use these for my Predator 420 with a header and intake now the motor will not run unless the choke is half on this means the motor is starving for fuel these will not provide a good Baseline for a predator 420 he will really need to start with at least a 44 45 or 46 to have a smoother running engine after a header and intake is installed on your Predator 420

Worked perfectly! Easy to install and good performance increase!

ended up using the .042 on a predator 420cc in a golf car

Cool your jets

Did not work to much fuel