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Fleetwin, If I change the head now would I have to disturb the head/head gasket later when I replace the print at the bearing? Looks like I would not have to per t2stroke . I replaced the upper carbon seal this winter with a new carbon and replaced the inner ring with the square type as recommended by Frank. After using it a few times I found fuel leaking in the seal area and running down on to the motor. So a couple of weeks ago I pulled the seal apart again and put in the factory recommended oring. I ran the motor (skipping) for a few minutes and oil was in the seal area with that also. Maybe the O ring around the bearing is bad.
I have an Rd15A with the same problem.