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Joined: Jan 2023
Posts: 16
Novice
Hi everyone,

I've been mucking around with a few mowers I bought of Marketplace for 20 bucks each. Got them running and one is now my daily... but, I've got a Victa Corvette (see photos) and the carby seems incomplete. It runs now I've taken it off and cleaned it, put a new spark plug in, all but my questions are:

Should this model Carb have a white "idle screw" in the back??? (see back cover pic below).
It also doesn't have the big silver disk on top of the diaphram - should it have this???

It starts first pull and runs like a champ but the idle is very fast (I'm thinking the lack of idle screw is why)???

Any advice is greatly appreciated.

Attached Images
PXL_20240416_012840848.jpg (466.08 KB, 31 downloads)
PXL_20240415_224330669.jpg (648.55 KB, 31 downloads)
PXL_20240416_004511636.jpg (442.36 KB, 31 downloads)
PXL_20240416_012851784.jpg (486.33 KB, 31 downloads)
Joined: Sep 2022
Posts: 60
Likes: 4
Trainee
I put a carbie back together and left out that diaphragm locking plate (if that's what you mean).It idled to the point of self destruction!

Danny

Joined: Jan 2023
Posts: 16
Novice
Hi Danny, yeah, I think that's what it is. Silver plate. It doesn't idle really quickly, its a little fast perhaps but nothing like you've described above. It wasn't actually there when I pulled the carby apart and I don't have one laying around so put it back together without one.

Joined: Jan 2016
Posts: 7,467
Likes: 143
SENIOR TECHNICIAN
Danny,
what self destructed? These carbys can be modified to work perfectly but it is quite a bit of work then you can adjust the idle to work perfectly.Victa could have made them this way but they cheaped out and caused thousands of owners to have problematic carbies

Last edited by NormK; 16/04/24 03:11 PM.
Joined: Sep 2022
Posts: 60
Likes: 4
Trainee
I may have exaggerated a tad Norm.

Danny

Joined: Jan 2016
Posts: 7,467
Likes: 143
SENIOR TECHNICIAN
OK I was just wondering how long it took to self destruct

Joined: Sep 2015
Posts: 2,059
Likes: 146
SENIOR TECHNICIAN & HISTORIAN
Hi Return Rider,

Yes the back diaphragm plastic cover is missing the white idle screw but you can put a later cover on without the idle screw.

The silver disk on the diaphragm locks the diaphragm to the poppet valve so it should have this or some sort of clip.

The idle screw won't slow the idle if it's missing and it's running too fast ,if the motor is in good mechanical condition
then it may just be the carby parts have worn and to fix this you add a brass washer to hold the poppet valve in a
more closed direction to bring the idle down.

Cheers
Max.

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