Standard Fork Question

[MPittma100]

I have noticed something interesting in the Yamaha factory service manuals. It concerns the amount of fork oil to be used when replacing the oil. They recommend a lesser amount for the E than the newer models. Newer models seem to require about an ounce more.

Does anyone know the answer to this riddle?

Mike

[jetmechmarty]

The Specials have longer forks.

The air space on top of the oil is a tuning point for the front suspension. Air will compress; the oil will not.

[BA80]

I've noticed that too Mike. The oil capacity is different from a SG to an SH but I can see no difference in the internals.

My thinking is along the lines of what Marty said. More oil = stiffer ride.

[MarkD]

not sure about the others, but my '79F calls for 7.12 oz. of fork oil, I just did the old fork seal job.