UMM the other day i rode my quad and it did not run to good, it was warmed up and everything. We found that it was the jet size so we were gonna change it today. But, today i rode it and it ran amazingly. Should i still change the jet? Thank you

 

You should probably put a slightly richer jet in it. Air temperature affects jetting because colder air is more dense, and therefore requires more fuel to go along with the extra oxygen. Take your spark plug out, and look at the tip. If it's white or very light colored you need to richen up the mix. If it's tan you're ok

 

insted of rejetting i would suggest to just adjsut the A/F ratio

 

Rejetting IS how you adjust A/F ratio! The fuel screw only adjusts the ratio at idle, so you'll need to adjust that along with the main jet, and maybe the needle setting too. The needle setting isn't as touchy as the idle circuit and the main, but sometimes it still needs adjusted.

 

thanx