AvidCatRider

Stock exhaust, stock factory jets. Starts gasping around 1/2 to 3/4 throttle, closer to 3/4. I am essentially at sea level. I have had the quad for about 5 years, this just started happening when I fired it up over the weekend after it had sat since summer. Gave it the mini-tuneup, cleaned the jets and checked the float to try to resolve. I have run it with and without the air filter, no noticeable difference... but as soon as I put the airbox lid back on it becomes noticeably worse, even with no air filter in place. I agree that it seems like it is running too rich, almost like it wants to really open up more than usual if it could just pull more air. I am really baffled. Thanks for trying to help.

My Cat sounds like it is gasping for air at high rpm's. Idles great and runs strong to about midrange on the throttle and then sounds like it is choking out. Fresh plug, clean air filter, cleaned the jets, float is good. Runs better but not perfect without the airbox cover in place?????? Checked the "snorkle", all clear. Any ideas?