Quick question. Just got a YFZ 2 days ago and am having some idle problems. When you go fast then pull in the clutch to coast and begin to slow down it dies. Is this a simple turn the idle screw fix or is this something more? My brother called me and told me about the problem, I won't have the bike back till tomorrow. Also, he said after about 20 minutes of riding it gets better. Thanks yall.

 

I've seen this problem a couple times at the shop I work at. First, start the quad and let it warm up. Make sure the clutch is adjusted properly(at the perch there should be 3 to 5 mm of cable slack)
It more than likely just needs to be idled up a bit. There is a black **** to the rear of the carb on the left side. Turn it clockwise.

 

Thanks alot for the tip, i'll check it out when I get it back tomorrow. Thanks.