what is the top speed of a 2003 kx 250?

[bigguns30]

     

just would like to know the top speed of a 2003 kx 250? thanks.

[bigguns30]

how much horsepower also?

[Jeff172]

Top speed will vary depending on gearing. It isn't as fast as you want it to be though. On a 2001 yz 250 with stock gearing I was clocked 5th pinned at 51mph. smaller back sproket will get you faster, but you'll loose bottom end power.

[Rockey]

51? That doesnt sound right at all. I used GPS on my 125 with stock gearing and got 73 mph.

[CRacer]

I think a 250 would run way past 50!

[RM250BS]

My 2001 RM250 clocked out at 75mph with the stock front sprocket and a 48 rear (49 is stock). Dirt bike magazine ran a HP chart on the 2001 RM250 and it ran at 43.8hp at the rear wheel. The 2003 KX should top out around 75 and Dirt bike magazine has a hp reading of 42.5hp at the rear wheel

[Jeff172]

Stock rear on my YZ was a 52 tooth. With a 49 it would hit around 70mph

[Mr2stroke]

I dont get it. I thought 250s went over 100mph. I got my 83 cr 125 up to 80mph. It has 6 gears though.

[Moto Toad]

I heard all modern "out of the box" 250's run in the mid-70mph range.

[Yardpro393]

the 450 will hit mid 80's,
so 75-85 would be my guess.

and jeff, if your yz would only do 50 something was seriously wrong with it.

[Mecrazyperson]

My 02 CR250 was clocked at 92 by the highway patrol out at glamis next to the road. But I had less teeth on my sprocket that weekend.

[99kx250rules]

I had a buddy of mine ride my Virago along side of me one day. He clocked me at about 72MPH before I slowed down. I use 13/49 sprockets. I try not to do that too much because it is just plain bad for the motor.

[1989kx125]

Originally Posted by Mr2stroke

I dont get it. I thought 250s went over 100mph. I got my 83 cr 125 up to 80mph. It has 6 gears though.

80 mph what was your source for getting the speed?

[quadfather03]

Here is a suggestion why dont you try a speedometer that rocky mountain sells for 75.00 it measures top speed average speed current speed and time worth the money im getting one soon.

[1989kx125]

is it one of those electronic ones with the magnets?

[AndrewPA]

I know the post was originally asking about a standard KX250 but just out of interest, Dirt Bike Rider magazine in England did a test years ago with a CR500 fitted with road tires. They fiddled with the gearing for speed rather than acceleration and they got, if my memory serves me correctly, 115mph.

[1989kx125]

thats sounds possible to me. i've heard they do like 95 with the stock gearing and tires.

[Mike's2003YZ250]

I like threads like this, and it seems you get much better responses here than somewhere else I am a member as well. : The "other" forum I am a member of, all you do is get made fun of for asking a top speed question. Of course top speed doesnt matter much on a motorcross bike, but some people like to blast their bikes down a straightaway, like me! Come on, Im sure we all can admit we dragraced someone atleast once to show the other guy whos boss! Since I like topics like this, I wanna add a little to it. I have read that the top speed of my bike, the 03 YZ250, is about 75-77mph. My gearing is the stock 14-50. What I was wondering is how many mph would you gain in top speed by going one tooth bigger in the front or one tooth smaller in the rear. I was guessing about a 5mph gain for every tooth change, or maybe its not that much?? Going up one on the front would be a bigger change than down one on the back tho I would assume. So one up on the front may give you 5 extra mph, but down one of the back wouldnt maybe?!? Just curious, thats all. I appreciate the help. Mike

[OLDMXRACER 393]

Originally Posted by Mike's2003YZ250

I was guessing about a 5mph gain for every tooth change, or maybe its not that much?? Going up one on the front would be a bigger change than down one on the back tho I would assume. So one up on the front may give you 5 extra mph, but down one of the back wouldnt maybe?!? Just curious, thats all. I appreciate the help. Mike

I think to figure that would take a math equation that's WAY above my head. Wouldn't the change vary with the multiplication factor of the rear sprocket also? Oh my head hurts....DCOX, where are you?!?!?!

[Kev]

With stock gearing I can about 102 out of my cr500, if i drop a tooth or two on the rear , Id probally hit the 105-110 mark