big rig57 Posted April 7, 2010 my 2004 yz450f pops really bad when i let off the gas i have a jet kit i just dont know were to start. Share this post Link to post Share on other sites
larsoc5 Posted April 8, 2010 Don't take this the wrong way, but... Step 1: Use the search feature.. If you don'f find what you are looking for go to step 2. Step 2: Create a post with enough info in it to help us help you. (Year, Make, Model, Bike Modifications, Current Jetting, Elevation and Type of riding) Step 3: Wait till someone, who knows something, posts helpful information. Thanks P.S. Assuming this bike is mostly stock: PJ 48 MJ 170 and fuel screw 2 turns out works good for your neck of the woods. Share this post Link to post Share on other sites
BDubb106 My Ride Posted April 8, 2010 Try this, although popping is normal on the yz... if it pops too much your lean 1) Turn the fuel-screw down (in) a 1/4 to 1/2 turn (which is actually a air screw). 2) if that doesn't do it, go up one in the pilot. 3) last but not least, move the needle clip down one position. not to sound rude but try searching next time, odds are anything you need has already been posted/ asked and discussed Share this post Link to post Share on other sites
