What is the top speed of a stock 400EX and a 450R?

 

400ex maxed out down hill on a poliece radar is 66mph

 

Mine top out at 59mph on a flat road.

 

there's something wrong with ur 400ex then!!! is it broke in at all? thats way to low! i personally clocked 3 different 400ex's all stock to make sure the one wasnt a fluke! so theres something wrong there

 

06 trx450r stock 75-80 hrc 450r will do 80-85-90

 

i highly highly doubt the 450r will do 85!! thats quite abit for a 4 stroke even for the high proformance bike..... b/c it takes alot for a 2 stroke to get to that speed!! banshee's are running 74.5 i think or thats almost dead on i am pretty sure its been a while since i clocked one.. but i dont think u can get those speeds out of that engine without some extensive engine work! not just some HRC kit!! whats that come with just a cam new higher compression piston?? and mabe a new jets and airfilter?? but i dont see those speeds happening! i would have to see it to believe it.. it took me a tone of work to get my lt250r up past 85 i had to put a stroker crank go the bore to the max i dont remember what it was k&N filter ported and polished V force reeds and go up on my compression! i havent had an acurate clock yet but i will have one soon and take a picture and post it up

 

A stock 450r is only geared to top out at 75 or so. A cam kit would not change the gearing so the dude who said 85 is full of poop. I'm OUT

 

my stock 450r went around 74. and it still goes the same speed with a full pipe, jetted and air filter. The only thing you gain when you but aftermarket stuff on is how fast you get to that top speed. The gears inside the case can only spin so fast. My old stock 400 went 60ish if i remember right.

 

I built a banshee for one of my friends, that we were getting 84-85mph top speed. .030 over pistons, dynatek cdi, FMF pipes, jet kit, 22" rear tires, but I cant remember the sprokett sizes(not stock). It has no problem getting to top speed but it is limited by the stock gear box

 

true the only reason im getting the high speeds on my LT is i changed the gearing i think i went like 2 up on the front if i can remember right or went 2 down on the back something like that! but when i ride trails i put the gearing at stock or even 1 down to get more dig