What is the top speed of a cr 250 with fmf pipe and silencer

 

I am not sure but I think it would be around 80-85 MPH

 

i would say more like 65 to 67 mph... they are motocross bikes not dune racers

 

Ive had my cr125( Fmf pipe and silencer, and v-force reeds.) goin 70+. Thats the max on a friends speedometer. So i would think the cr250 would be faster than that. Prolly around the 80's.

 

Here's some numbers for you. These are all completely stock bikes run on the same straightaway, by the same rider, within two hours time, and were read by two of the same radar guns for acuracy.

CR125R...69
CR250R...77
CR500R...89

YZ125.....69
YZ250.....78

KTM125...71

KX500.....86
XR650R..103

So.......depending on the type of exhaust he is using, the air temprature, overall condition of the engine, and elevation issues if any..............................................a nything around 80mph would be a fair assumption.

 

Sounds right.

 

how fast would the crf230f go??

 

sounds right to me and all i own is a cr125

 

A lot depends on gearing, as well. It probably has the HP to go 90+ in the right conditions, if you could get the right combination of sprockets, and on hard ground. If memory serves me (I used to be a bike guy) the CR250 with stock gearing would about push 80 or so.
I have seen more or less stock XR250s do almost 80 (the one I have right now will do 75+ under the right conditions) and I KNOW the CRs have at least 1/2 more HP, and less weight.