Your GPS and his radar gun. Your weight and the weight of the guy that used a radar gun. The wind direction on that day vs the wind direction for the radar gun guy.

For you and your friend, your weight vs his. Your quad is fine. 71 mph is in the ballpark. You obviously beat him to the 300' mark, thats where real drag races are performed. If you want to go a little faster than 71mph, do as the other person said and install a 14 tooth front sprocket.

 

I weigh 180. Airtemp was about 82. Flat level blacktop. Wore a helmet with visor but crouched a little. The cop tells me the guns are "calibrated" before each shift and "certified" yearly. He locked me in so I could see it on his dash. He also chewed me out for going that fast because when he agreed to radar me he thought 4-wheelers did about 45 or so. Mine is so stock, I am still on my first tank of gas. Besides tearing up my yard, I have only been on 1 real ride with it which was about 40 miles or so. Most of this was in 1st or 2nd gear because I had one son on it with me and my other son was riding his new 125 for the first time.
I have been out of town so that limits the riding. I did order a motion-pro twist throttle today along with new grips and am thinking seriously about the CT Racing bolt on kit with header pipe, supertrap, and jet kit. I'm hoping that besides more power, this may give me more top end. A larger front sprocket may be your answer but in just the short time I've ridden mine, the gearing already seems pretty tall.

 

The gearing is fairly tall for stock Raptors, but on blacktop and flat ground it should still be able to pull a 14 tooth front sprocket on long hauls with a 200lb or less rider.

 

I'm 15 and weigh 137 pounds and my Buddy is 17 and weighs 150

 

Adjusting the valves is important. I checked mine at about 6 hours and they were tight.
Stock, what's that? A little mod you could do is trim the flaps out of the snorkle and put in 145/150 main jets and turn your mixture screws out about another 1/4 turn and ckeck and adjust your float level.

 

Stock! Whats wrong with me. I know I'm looked upon with suspicion because of this and am working quickly to fix this faux paux. Hey, you will have to give me credit though, I will have put my first performance mod on before I hit reserve on my first tank of gas.

 

so I should check the Valves and thats probably the problem or dont you really know It sould be going faster then 71.3 with a 137 pound kid on it

 

Some bikes just run stronger than others even if they are the same model, year, etc.!!!

 

Is your throttle limit screw backed all the way out? It's always a good idea to check valve lash and float level but I already told you how to increase your top speed, change one of your sprockets.

 

Hey man iam 14 and i had a banshee and a raptor a raptor only goes 71 and a banshee goes 74 so dont feel bad pipe you bike and then see who wins