did you measure the total thickness of these washers you added? I had quite a time finding the right washer/ combination of washers to make up 1.6mm thickness as instructed in NormK's carby mod thread.
G'day Mowerfreak,
Unfortunately, I don't have anything like a vernier calliper to measure them with, but I can tell you that they're mighty thin. Also note that as a service part, a maximum of 4 are recommended to be used, and I'm pretty sure each one is less than 0.5 mm thick. And at retail, they're expensive for what they are, anywhere from $1.50-$3 for just 1. I've seen some wholesalers/distributors selling them for less than $0.20 each haha.
I purchased quite a few so I have spares and so I don't run out any time soon, so I'll try to send some pictures or measure them for you and send something through.
That's great to hear mate, so it also works on the LM carby with no idle screw. So in the end you just have to live with whatever idle speed you get on these carbies even after adding the washers? I guess if it's too slow and stalls you have to take a washer out or something? Trial and error I suppose. I've only ever had a mower with an idle screw, it just feels weird using a mower without an idle screw...lol
Well this is good to know as when I start working on the powertorque mower with the LM carby, I can also try these brass washers if it runs too fast at idle etc. We'll see what happens.
Hi Mowerfreak, I got my brass washers here at Outdoorking back in 2011. Here's the same link to the washers below:
Thanks Converse for the link. I had to sort through many washers to come up with one combination that worked, though I found a pack of washer assortments if mine that included a size that fit over nicely, with a thickness not far off (1.7mm approx) I'll try that next time.
Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!
MF somewher you asked how I did the idle screw nut. I drill a 3/16th hole through the center of the cap, the run a 6mm tap through it. Then I put the nut on a 6mm bolt and screw it into the cap, then JB Weld the nut in place being careful to not getting any on the thread. Seems to work ok. When I get the mower up and running and I set the idle, I put a bit of silicone on the thread of the bolt and screw it in till I get the idle I want. This holds the screw enough to prevent it from moving once set but still allows it to be altered if required
so it also works on the LM carby with no idle screw. So in the end you just have to live with whatever idle speed you get on these carbies even after adding the washers? I guess if it's too slow and stalls you have to take a washer out or something? Trial and error I suppose
Hi Converse,
Yeah that's right. As far as I can tell there's no definitive measure of how many washers you need, it's a trial and error, based on how the mower is running, which can be a bit frustrating but I find the PowerTorque engines often rev a little high so putting an extra washer first is normally a good idea, remove one if you need to.
Originally Posted by Mowerfreak
I had to sort through many washers to come up with one combination that worked, though I found a pack of washer assortments if mine that included a size that fit over nicely, with a thickness not far off (1.7mm approx) I'll try that next time.
Hi Mowerfreak,
Just remember, the maximum thickness recommended is 4 of these brass washers, and that would be for extreme wear. The mower I was working with was over revving quite a bit, and 2 washers resolved the issue. A standard thick washer also resolved the issue but caused issues with the throttle cable movement, so don't go too thick with the washers or you may run into other problems. Stick to the super thin washers.
