Hey Maxgara,
No doubt Tomo or Joe will chime in here however I'll start with a few idea's for you. Joe and Tomo are more experienced with the Victa's.
1) Have you checked the diaphragm in the carby? This is done by sucking and blowing. Very little air should pass through the carby if it is sealed correctly when you blow on the governer hose. A stuffed diaphragm will make it rev hard.
2) Check the governor port is not blocked - blow compressed air through it. I usually like to remove the flywheel and thoroughly clean the area in question.
3) Replace both manifold O Rings (small and large)
3) A washer or 2 behind the throttle cam lowers the engine speed however be careful as it lowers the idle as well.
4) Check the bottom crankshaft bearing if none of the above work. It will more than likely be covered in oily guck which is an indication of an air leak. The bearings are fairly easy to replace without a press.
Hope that helps.
Jaffa
