G'day Pau13z and NormK,
In my case on the G4 which I know was factory original was I added in those 2 brass washers to fix up the fast idle problem and it definately fixed it perfectly, I haven't modified the carby or changed any springs at all. I did this back in 2011 when the mower was 29 years old. So in my case I guess it was the wear on the carby and the 2 washers fixed it up and gave me fully adjustable idle again.
Like I said I had all new seals for the engine and carby also, but these 2 little brass washers fixed up the fast idle on my G4 that's for sure.
I haven't yet started working on my own powertorque engine but I will be soon and I think it may have similar problems to your mower pau13z. When I got mine started the other day, I also didn't have much between the idle position and full throttle. But this thing has been sitting unused for 10 years and it had a seized engine. So when I really start working on it I am sure there will be a carby rebuild involved for me also.
Yes the washers that I added is the number 8 on your diagram, so it seems that this was also a service fix maybe on these LM carby's?
I don't know about the spring you have changed also? Maybe if this spring tension is too much it can make it idle/run faster?
Because on the G4, where that spring sits which you have changed it's where the idle adjustment screw adjusts from on the G4's. When you screw it in it pushes onto the poppet valve and opens it a bit for a faster idle, screw it out and it closes the valve a bit for a slower idle.
I hope another user here that's more familiar with these LM carby's on a powertorque can give you more help and advise mate. I do like NormK's modified LM carby though. I might end up doing this mod on my Victa powertorque mower if I can't get it to run reasonably well as a original rebuilt LM carby.
Wish I could help you out more Pau13z but I am more familiar with the older full cranks and the G4 carby than the powertorque and the LM. But i'll soon be rebuilding and working on mine so we'll see how it goes.
Cheers!
Last edited by Converse; 15/02/19 04:11 PM.
