If anyone has these numbers handy for the different bikes could you please post up the actual numbers, this is a question I was going to ask about the '02 FC550 as I was unable to locate the rod length either.
owners doc (again!)the rods have been measured and verified by a UHE member who is smart enough to do a 750cc bore and stroke kit. if you don't believe JBSracing then PM him!
As far as I know the 2001-2002 were 134mm and 2003-2004 were 135mm. On one of my engines there was a 135,5mm rod with "Rotax" stamped on it, but it didn't came out of the production. Imagine what compression that gave with a 470-piston!!! 8O