How do you adjust the idle speed on a Victa Sports 160 lawn mower - currently too fast.

Gary, December 2007

hi , some g4 carb had idle screws to move the poppet valve in or out , most common problem's for over revving is air leaks , replace all O-rings and give your carb a good clean also make sure your c on the poppet valve is facing the spray jet , if your cam has worn down you can add a poppet spacer washer in front of the cam , this will move it back from the piston side reducing revs , the max u can use is 4 washers which are available at any mower repair shop.

jet, April 2015

hi Gary the carby you are talking about is G4 carby, it is pos to bring the idle down, but hard to explain, if you have ever pulled one of these carbys apart there are alot of moving parts diaphram,vavle,two springs, cam,cam lock, ect.I will give you as much detail as pos,firstly i need to tell you not to touch primer/float bowl its nothing to do with idle. O.K take carby off mech by twisting down ,then take off diaphram cover with screw driver, note large spring ,then diaphram remove diaphram by moving washer to one side then pull off diaphram note smaller spring then cam lock (three leged has this side up on it)remove noteing how it goes back, next remove air filter snorkel , move the throtle controll on handle to the stop position but first take out kill switch wires one has a rubber cover on it then remove throtle cable , it needs to be in the stop position to remove, once the cable is out remove cam, now what is goeing to slow down the idle is a very cheep small washer that you need to buy from a mower shop , it goes on before you fit the cam, that brings the popet valve closer to its seat at idle,install the same way as removed best of luck jason

jason, December 2007

Dave, there does not appear to be any screws on my carby as you describe.
The carby is a round black plastic ? arrangement with a white circular disc on the side on which is mounted the fuel inlet and the fuel primer pump.

Gary, December 2007

There are two Screws On the carb one for air pet mix one for idle the screw you need to adjust is the one at a 45 degree angle screw clockwise for more revs anticlockwise for les revs

Good Dave, December 2007