I had a go at adjusting the mix screw and the throttle screw and seemed to have found a pretty good spot for both but I think the problem is the bottom spring on the throttle assembly. It is well worn and I think what is happening is the vibration of the mower losens then tightens the spring/cable, therefore self adjusting the throttle speed. I'll have to searh for a new screw I think. Also the wire from the butterfly to the springy thing looked a bit dodged up. Sorry bout the explanation but like I said in an earlier post, motors aren't my strong point.
As for the blade, I fiddled around with the screws and have managed to get a nice "wizzing" type sound rather than a scraping sound. Looks like the $230 service was a total rip off. They could have at least replaced the old spring. Thanks for your help.
