FMF jetting recommendations are based on the following conditions: Premium grade pump gas with Silkolene premix, 32:1 ratio. Sea level to 2000 feet above sea level. Temperature of 70 degrees Fahrenheit with average humidity.
Your choice: YAMAHA --> 2000 --> YZ250
Jetting Information
Main Jet: 170
Pilot Jet: 50
Needle: STOCK
Needle Position: 3RD
Power Jet: N/A
Air Screw: 1 :thumb:
i have a 98yz250 with a fmf pipe and silencer
main-168
pilot-48
3rd clip on needle
i live in tennessee also, it took some trial and error to get the this right-
i also probably use a different mix than you, which plays a role also
my bike is fouling plugs on the slow ride in on a trail probably a 2nd gear trail. It takes about 12 minutes to get in to the riding area. Once I am in i have a real bog and trouble on the restarting of the bike. I have to open the throttle wide and kick it to get it started. Any suggestions? thanks