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View Full Version : What size is this piston for the 400ex??



Andrew400ex
08-03-2009, 01:15 PM
Hey just curious if somebody could help me figure out the displacement of this Wiseco piston I got left over thru the years..It came with one of the bikes I bought years ago and I always thought it was a 416cc 11:1 high comp pistion but when i just wanted to check..the box only says 88mm on it so i searched the web and if I'm decoding this correctly it's tellin me the 88mm is equivalent to a 426 and the 416 is a 87mm..is this correct?

..reason i'm trying to figure this out is because the kit and head gasket are for sale, new in packaging. i just wanna make sure i give potential buyers the right info. thanks for anyhelp

Andrew400ex
08-03-2009, 01:23 PM
http://i865.photobucket.com/albums/ab219/zammit400/PICT0755.jpg?t=1249327328

CSR400EX
08-03-2009, 11:16 PM
you are correct. a 88mm piston equals 426cc in a 400EX.