I got my cylinder bored on my 250R how much more cc's does going 1mm over give me? thats about the same as going 40 over

 

umm...maybe...5?

I'm guessing here.. :-)

 

Check out this site. . . .
http://pub20.ezboard.com/bhondatrx250r

Look under tech tips and click on "Info for the heck of it."

Tells all the dimensions you come with when boring a 250R.

 

Why not just do the math???

The volume of a cylinder is calculated as follows:

Pi*r*r*h

where Pi = 3.14159
r = the radius of the cylinder in centimeters
h = the height of the cylinder in centimeters

Example, my Bayou 400 has a bore of 81mm and a stroke of 76mm. The actual displacement is calculated as follows:

3.14159*4.05*4.05*7.6 = 391.6cc

If I were to bore the cylinder by one millimeter, then the expression would be:

3.14159*4.1*4.1*7.6 = 401.4cc

In this case a one millimeter increase in bore diameter produces a 9.8cc increase in displacement.

If you can use a simple four-function calculator, then you can use this formula to calculate the volume of any cylinder.

Army Man