When I first got my o5 king quad I got a no toil air filter for it. Just last week it began to rip a little from numrous cleanings.
So i went and got a twin air to replace it. And, from what I can tell that was the biggest mistake I made. The diffrence is enourmous The no toil gives the King quad way more power. With The twin air filter the King boggs down going up hills in 4wd and with the no toil Im letting off the throttle just to keep it on the trail. The diffrence is so great I am even wondering if the is a problem somewhere other than the air filter. If anyone elses knows a problem I might be haveing let me know.
Sorry to hear that. I run a twin air. I have had very good luck with it. From what I have been reading on other King forums everyone likes the twin air better then the no toil. But don't get me wrong there both great. Maybe it was over oil? Maybe your quad is running way lean now? What other mods do you have done?