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turbo
08-09-2004, 05:01 PM
Alright i broke down and bought a jet ski, its a kawasaki 750.... well was a 750. the previous owner blew the motor up, and i bought it dirt cheap because of this, my question, the stroke stayed the same, but the new pistons are 1.5 mm over stock, or .080" what would my new cc's be?
Black Sheep
08-10-2004, 08:32 AM
without knowing the bore or stroke of your motor its impossible to tell. but, you can figure it out yourself with this formula...


Bore X Bore X Stroke X .7854
Mr. Richard
08-10-2004, 08:51 AM
OH BY THE WAY 1.5MM IS .060 OVER,,,, :D :D :D

the difference will be almost nothing in performance,,, and since you didn't ride it before you really won't see a difference.:D
360X
08-10-2004, 10:30 AM
Originally posted by MR ATC
without knowing the bore or stroke of your motor its impossible to tell. but, you can figure it out yourself with this formula...


Bore X Bore X Stroke X .7854

Actually,

You take the bore and square it first, or take the diameter of the bore and cut it in half, then times it to the same number again. Then times that by the stroke, and times it by PIE 3.14.

I.E. A 350X with a 1mm over piston in it has an 82mm piston, and the stock stroke is 68mm. So you take 82 divided in half = 41. Then take 41x41x68x3.14=358927.12. Which rounded up = 359cc engine displacement.
Stan MaN
08-10-2004, 02:09 PM
Righto!
turbo
08-10-2004, 02:38 PM
Alright, thanks guys, i knew there was a formula for it, just couldnt remember what it was. :doh:
Black Sheep
08-11-2004, 02:41 PM
Originally posted by Fast416ex


Actually,

You take the bore and square it first, or take the diameter of the bore and cut it in half, then times it to the same number again. Then times that by the stroke, and times it by PIE 3.14.

I.E. A 350X with a 1mm over piston in it has an 82mm piston, and the stock stroke is 68mm. So you take 82 divided in half = 41. Then take 41x41x68x3.14=358927.12. Which rounded up = 359cc engine displacement.


ACTUALLY there is more then one way. the method i listed is the same method WISECO use's and i've found to be 100% acurate
Mr. Richard
08-11-2004, 07:06 PM
hmmm actually both work,,,,, hmmm one makes it 358.9 and the other makes it 359.1 i'll use the one that makes it BIGGER!!!:lmao: :lmao: :lmao: :lmao: