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Shorty
06-04-2010, 08:51 PM
90mm bore and a 64.4mm stroke how many cc's would you have?
Xpress
06-04-2010, 08:54 PM
As many as possible.
shortline10
06-04-2010, 08:58 PM
90mm bore and a 64.4mm stroke how many cc's would you have?


You need to learn this equation . Bore X Bore X Stroke X .7854 = cc size remember to move the decimal point to the left one number .

So 9.0 X 9.0 X 6.44 X .7854 = 409.6 cc
volfan537240
06-05-2010, 12:00 PM
thats one big ass piston!!
Shorty
06-05-2010, 01:35 PM
thats one big ass piston!!

Yea I know. Its going in a 1984 250r motor:naughty::naughty:. When I finish it it should scream and do wheelies all over the place because i'm keeping the stock swinger:D:lol:.
volfan537240
06-05-2010, 02:33 PM
whats that piston from?
Shorty
06-05-2010, 02:58 PM
whats that piston from?

A cr480. But its 1mm over so its 90mm. Stock is 89mm.
ForeverThreeWhe
06-06-2010, 10:22 AM
http://www.nightrider.com/biketech/calc_displacement.htm