I'm looking to buy a new carb for my chinese Coolster 125cc atv, I have cleaned it and tried many things to fix it- it leaks gas and now oil. I keep seeing PZ19, PZ20 and PZ22 to fit 125cc's... Which is the best one for the ATV I have? Any info would be helpful.

thank you

 

At a guess any would be close enough. Presumably Coolster knew what they were doing so the one with the same "choke" size should be best. Measure the bore of your old one in mm and order the same number. It won't run properly "out of the box", you will need to set the needle and slow running jet to suit your engine.

 

My Jetmoto 125 came with a PZ 19 carb..

 

PZ19 size is most common and requires the least work. There are different choices with fuel shut off and choke location. Brass lever chokes are usually the worst becasue choke parts can come loose and then swalled by the motor which bend the intake valve. Whygstock.com has a few different options.