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how goods your math???
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Posted by: honda300EXtreme

ok i have a 300Ex bored 1MM over stock what would the displacement be cc wise

i came out with a 307 but im only a C student

thanks on advance

Posted by: Xater

that sounds like alot, stock bore is 287 or somthing right?

Posted by: 300ex_#387

quote:
Originally posted by honda300EXtreme
ok i have a 300Ex bored 1MM over stock what would the displacement be cc wise

i came out with a 307 but im only a C student

thanks on advance

If your using the stock sleeve it can only go to a 305 without having to resleeve. I think it would come out to 289cc. Stock cc's is 281.

Posted by: honda300EXtreme

well what i think we did was resleeve with a sleeve 1mm over stock. because my quad had sucked the valves

Posted by: bwamos

300ex stock displacement.
74mm diameter x 65.5mm stroke = 281.56 cc's

+1mm over:
75mm diameter x 65.5mm stroke = 289.22 cc's.

Formula:
(((Bore/2)^2)pi)stroke = displacement.

(((75mm/2)^2)pi)65.5mm = displacement.

(((37.5mm)^2)pi)65.5mm

((1406.25mm^2)pi)65.5mm

(4415.62mm^2)65.5mm

289223.44mm^3

289223.44mm^3 * (1 cm^3 / 1000 mm^3) = 289.22 cm^3

cm^3 = cc

Posted by: jonboy

Well you just think your a rocket scientist dont you? LOL. j/k

Posted by: honda250xrider

i've always found this formula to be pretty simply, bore x bore x stroke x .0007854 = cc displacement always has worked for me

Posted by: Kickstarts-suck

it should be 289

standard (74mm) is 282cc

0.5mm .020 (74.5mm) is 286cc

1mm = .040(75mm) is 289cc

1.5mm= .060 (75.5mm) is 293cc

2.0mm= .080 (76.0mm) is 297cc

from magicracing.com

Posted by: x rider1291

quote:
Originally posted by Kickstarts-suck
it should be 289

standard (74mm) is 282cc

0.5mm .020 (74.5mm) is 286cc

1mm = .040(75mm) is 289cc

1.5mm= .060 (75.5mm) is 293cc

2.0mm= .080 (76.0mm) is 297cc

from magicracing.com

haha yea wutever he said