i have a 99 yamaha warrior that i just put a hmf slip on and replaced the factory filter with a uni filter the pipe come wit three jets a 147.5,152.5 and a155 and these insructions pilot jet & fuel screw:idle to 1/4 throttle. when possible set the fuel screw to the highest smooth idle w/ engine warm. needle: 1/4 to 3/4 throttle. main jet: 3/4 to wide open throttle. this is my first time doing this so im trying to get a more detailed intructions on how to do all this and which jet size should i go with any help would be greatly appreciated thanks.

 

Try different ones and see what works best

 

what about the needle which slot should i set it on just go up one at a time till i find out whatworks best