CCrosswait wrote: Had a similar issue on my KZ1100 after I first brought it home. Turned out the problem was the o-rings between the top of the cylinder and bottom of the head. On the 1100 they seal around the outside studs for oil return.
Looks like the 550 has a different arrangement but still uses some type of o-ring, part number 92055-1147. Might be worth investigating.
I had the same, I understand the reason is the o-ring get old and hard. I got a tips try to torque the top bolt just alittelbit exstra?
