Quick update.... got the parts and the guy I was getting to look it over installed them and fired it up again, and the problems were the same or even worse. He then gave the engine back to me and after looking at if for a while I deceided to take a look at it. I took it apart and found one major thing. After looking at the NEW plunger that I received from YS and the original found in the motor, their was a noticable size differance between the two. The new one, installed with a new spring, would not even contact the diaphram so the regulator screw had no effect. Putting the old regulator in with the old spring it now contacts it just fine.

It now runs great and super strong. One thing I have noticed is that it is quite sloppy...alot of oil getting over the firewall etc. Is this normal or do I possibly have another problem?

Thanks.