Late to the party, sorry. Over revving usually means an air leak, so...Change O rings on starter, Carby, and two on the inlet manifold (with one O ring, you need to take the manifold off the engine block by unscrewing both mounting screws). Make sure the venturi connection on the engine block is free of gunk, the end hose of the carby connects to this, as the vacuum can be affected if it is blocked and it will rev almost to the moon, so try pushing some wire back and forwards through the little pipe there. Also make sure that hose is clear. Make sure there aren't any leaks in the snorkel hose or through the filter housing itself; crimp the hose in various sections (with your hand) to see if the revs lower when you do. Try placing a small brass washer or two under the carby lifter. Last of all, if none of the above works, try putting the poppet valve in on the "B" position rather than the "C" position. You can even try "A" if you like. C is leanest mix, followed by B setting, and A is the richest setting. Good luck (if you are still fixing it).

This video is a year old but what the heck. The following information might help someone in the same situation. Top conker's video shows a Victa G4 carburettor. If the over revving is not caused by a vacuum leak, you can reduce the engine revs by adding small brass washers to the G4's poppet valve housing tube underneath the cam. A maximum of four washers can be used. Alternatively, engine revs can also be reduced by re-positioning the A, B, C, lettering on the bottom of the poppet valve. Positioning the letter 'A' so that it is closest to the float chamber at front will give lower revs. Positioning the letter C in the same manner will give highest revs. Yet another method of reducing revs with a G4 carby is to change the long diaphragm spring under the end cover, to one of shorter length. Victa produced four different colours (red, yellow, natural, and green) to denote the different lengths and the effect they have on the rev range. Each spring would drop the rev range by 150rpm. The colours and rev ranges are shown in Victa G4 carby manuals. Cheers from Australia.

Good job Phil and congrats for going over 300 subscribers sir!👍🇺🇸🇬🇧

Interesting carb, I haven't seen one of those before

Great video mate hope you're well

Phil you will get it right just keep going on it

Keep up the good work you’ll get it Phil

Well it goes on.. I'm sure you will crack it mate

Well you have my attention on this one I've never seen one like that really different ! Hope you get it sorted and please document it I'm really curious. Usually high revving engines is governor related 🤷 Also that spring looks really long but hey it came out of there absolutely stumped !

Nice video Phil, on that carb does it have any check valves in it, sometimes if the check valves go bad of get damaged it'll cause the high revving. And hey, you're looking good brother.

Like already said it will most likely be an air leak somewhere. Greg gregson mentioned everything to check. If for any reason it still playing up after all those things (which will solve 90% of the time) you can try to fit a small washer onto the carburettor body under the cam plate. Sometimes the cam plate can wear down over time and the engine behaves its got an air leak, but its not. so the washer is to push it up very slightly

Odd looking carb, not seen one like that before. I’m sure you’ll get the issue sorted.

you can add brass washers/shims CR03619A buy from dc spares these take revs down.

Conquer that’s a two stroke should be able to adjust the fuel mixture and back off an idle and that should be OK but I’ve never seen a motor look like that before

man where are the on off wires that go into the carby. they must have made different carbys for over seas models. i have 6 victa 2 stroke mowers there fantastic

did you sort it out mate

Where can I buy this repair kit

Gd luck Phil sorry I can't help but a interesting video IV had a Briggs for 20 years it's not run for last ten problem was it was working I went to work my son cut the grass I tried week later it revs it bits of so just got put away

Yes a pressure tester would identify your issue.

i know you will fixit phil

That’s a victa for ya lol might just be old and warn out mate