my raptor hesitates when i punch it in first, all i have on it is a K&N with outer rap. could someone help me out because im getting pretty slow holeshot starts. thx

 

hmm sounds almost like timing... did u jet it??... whens the last time u had a valve adjustment??

 

not jetted and 2 month old quad never had valves adjusted

 

Turn your pilot screw out 1/2 turn. It is located bottom of carb , in front of float bowl, towards motor. As your new motor is breaking in, it is drawing more air and may now be alittle lean.
The K&N also allows air to flow more freely. If your valves are noisy then have adjusted.
You should check your valves after 20 hours of runtime.