Anyone out there know the on centres length of the yamaha conrod some riders are using. I know the M Z rod is 130  mill but suspect

the yammy rod is shorter. Can anyone help pleeeeeeease.

zavado 57.

Thanks for that info Brian. I thought I might be missing out on a smallish advantage that a shorter rod may offer in degrees of crank

rotation vs piston travel at round about half stroke. As it happens it only makes .5 m/m difference, for a given crank angle the piston

would open the exhaust port .5m/m earlier, assuming that is arround the 80-85 degrees atdc position. Anyhow with a 5m/m shorter

rod as the later yz is it would be impossible to remove enough from the base of the cylinder to put the transfers whare we want them

to gain the blow down time required for an engine having such an absurdley small diameter headder pipe. I think that is the reason we

get away with sutch comparitivly large exhaust timings on the mz, it takes a long time to get things moving through that long skinny pipe.

                                    zavado 57

                                 Dave Hutchison.