You can easily get results out of a polaris sport two stroke. They are cheaper and with 600 or so in mild mods you can hang if not beat alot of quads. I can tell you I have a 99 sport all stock engine with a UNI filter and 240 main jet/ a red spring. With this only I have beat 400ex's predators, 500 scrammy's, yamaha warriors. I am 250 lbs. It has one hell a hole shot. I going to do more to and really see what it will do. 800 is all I have in it too. lol

 

My Can Am ds450 has factory stage one kit. This really only consist of a slip on and computer program for performance and hits the governor in 5th gear at 72.0 mph with stock gearing.

 

ktm 525 and honda 700xx

 

My honda 700xx hits 80mph on gps completely stock on flat pavement.

 

I had a 2012 Polaris 850 Touring that hit 78 on pavement with less than 200 miles on it. never tried again but I'm sure with over 1000 miles on it would hit 80+.

but its not a sport quad LOL

 

I would have to agree, the Quadzilla 500 was an amazing machine, and the bolt ons even made it more ridiculous. Imagine that motor/transmission in a new 450 frame with a "suspension"!!!!!!

 

Not exactly 100% stock but my 2005 YFZ450 with race cut fenders, a Lexx slip-on muffler, K&N filter and Dynatek programmable ignition ran 81.41 MPH in the 1/4 mile at Bristol Dragway last year.Bristol is an NHRA 1/4 mile track that people like John Force race at so the track times should be fairly accurate.