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Discussion Starter · #1 ·
One of my friends just came over with this new 400ex he got.. it's got a high compression wiseco piston, a hot cam, White brothers E series exhaust, and some kind of intake setup with jetting... He let me take a ride on his quad (not all that impressive other than the massive amounts of low end).. I then pulled out my Z (despite the fact that the timing chain needs to be replaced) and let him take a quick ride on it, he was really impressed with the amount of top end power the Z has, he said it was almost too much.. Then him and I ripped down the street, and I pulled ahead of him by about 5 or 6 quad lengths (mind you, my clutch is slightly slipping) lol.. That was my final ride before I replace the timing chain, valves, and clutch.. 400EX's are slow!
 

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read his sig
 

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how?? mine is an 07 Z and my buddy had an 08 400ex and both were stock and i could never beat him, i just jetted and added a slip on hmf exhaust and i raced a 400EX bored out to i think he said a 440 today and still couldnt beat him. What the hell am i doing wrong?
 

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how?? mine is an 07 Z and my buddy had an 08 400ex and both were stock and i could never beat him, i just jetted and added a slip on hmf exhaust and i raced a 400EX bored out to i think he said a 440 today and still couldnt beat him. What the hell am i doing wrong?

You need to start making full sentences and using punctuation if you want people to give helpful replies.

Your Z, as long as it is running properly should be able to kill a 400EX in a drag. I don't really understand your post though...
 

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I guess I just dont understand why when the Bike was stock I couldnt keep up with a stock 400EX. Now i did some modifications too it and today when we were out riding i drag raced some guy i didnt know with a 400EX and still couldnt beat him, i asked what all he had done to it and he said just a bore kit and i think he said it was a 440 but i cant remember, this is the first sport quad i have ever owned, my whole life i have had utilitie bikes so i am just trying to get a feel for it. But i know i havent been able to ever beat a 400EX with my bike anytime ive tried.
 

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Could be the rider. If ur not used to it.
 

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or just not good, lol at the double post great minds think alike
 

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Discussion Starter · #11 ·
When I started riding that 400ex, I could tell right away that it wasn't a real revver like the Z.. It ran out of steam real quick up top, great for lugging though! My friend was really impressed with the Z, he loved the fact that the Z likes being up in the revs..
 

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Too many variables. I traded off my kfx400 for a 400ex that I gave my wife. There is no way that my 400 would have beat the 400ex by much if any at all. I like that the 400ex has alot more bottom end power which is most important I think.
 

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A while back when I didn't have my bbk, I raced a 400ex with a big bore kit and I beat him from start to finish on dirt but he kept spinning the tires, too much bottom end I guess. So we went to the street and he kicked my a$$! When I hopped on his ex, it had stupid bottom end torque! I was impressed with that ex.
 

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Discussion Starter · #14 ·
we were on the street... He jumped ahead of me on take off, but once I got into 2nd gear it was over for him.
 

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See, im lucky enough to have one of each I guess lol. Both of them are pretty much even when they are put against each other. Until it gets to the top end, and the ex then looses all potential. But the 400 ex was built for flat track to, so it could have some sprocket mods idk about.
 
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