Need help?


Search OutdoorKing by entering Key Words Below



Who's Online Now
5 members (Red Rum, JEH, NormK, QSR, metal1), 117 guests, and 53 robots.
Key: Admin, Global Mod, Mod
Online Spare Parts


Online Store


Newest Topics
VC160 Motor advice needed
by QSR - 20/04/24 04:37 PM
Victa 24 hubcaps
by NormK - 18/04/24 02:19 PM
G4 Carby????? Advice please :-)
by Return Rider - 16/04/24 11:45 AM
Fuel Hose for Victa
by Dandare - 14/04/24 07:35 PM
Recoil starter for Villiiers Lightweight engine
by Malcolm Arnold - 14/04/24 02:01 PM
Long term storage of engines - best practice?
by N1KK0 - 29/03/24 02:43 PM
1972 victa vc auto drive front wheels
by QSR - 25/03/24 09:10 PM
Topic Replies
VC160 Motor advice needed
by NormK - 20/04/24 05:25 PM
Fuel Hose for Victa
by NormK - 20/04/24 02:02 PM
Recoil starter for Villiiers Lightweight engine
by Malcolm Arnold - 20/04/24 01:29 PM
Scammers
by maxwestern - 20/04/24 11:11 AM
G4 Carby????? Advice please :-)
by maxwestern - 20/04/24 10:15 AM
Victa 24 hubcaps
by maxwestern - 20/04/24 10:02 AM
Robin EC10
by maxwestern - 13/04/24 06:44 PM
Long term storage of engines - best practice?
by maxwestern - 04/04/24 09:47 PM
1972 victa vc auto drive front wheels
by Mowerfreak - 03/04/24 07:53 PM
Victa Plugs
by maxwestern - 03/04/24 06:51 PM
Previous Thread
Next Thread
Print Thread
Rate Thread
Hop To
Joined: Apr 2006
Posts: 30
jamesl Offline OP
Novice
Hi Bruce,

I have a vantage 2 circa 1998. It become hard to control using the throttle control i.e. it only wanted to run flat out, idle or stop (no in between rev control). I suspected the carby, so I disassembled it and noticed that the large rubber diaphragm that the poppet valve is fastened to had partially flopped inside the chamber breaking the seal between the compartments. Also the grommet that holds the kill switch wire into the chamber is a bit distorted and maybe leaking air?

1) Do you think the problems could be related to the diaphragm seal? The diaphragm looks okay, and I have placed it back in its correct location and clipped on the cap that holds it tight.

2) Could an engine backfire cause the diaphragm to dislodge?

3) And should the distorted grommet for the kill switch make a good seal or is this distortion normal? It still seems to trigger the engine to cut out correctly.

Thanks in advance cheers2

James

Membership information
Joined: Dec 1999
Posts: 5,334
Likes: 30
Repair Junkie
****
James,

What I want to know is a detailed description on what you have done to the machine so I don't waste time with questions. sleep

1. Did you do anything to the carby. :Wavey:

2. Did you remove the blade plate. :Tweetie:

Please give me step by step things that you have done to the machine as it will be quicker for me to give you a correct answer and even pictures will help as well.


Regards,
[Linked Image]

Bruce


Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.
Joined: Apr 2006
Posts: 30
jamesl Offline OP
Novice
Hi Bruce,

The mower is completely standard, never altered other than new blades. All I have done so far is:
1. Remove the plastic top cover of the mower (3 screws)
2. Remove the cutoff switch wires
3. Disconnect the throttle cable from carby.
4. Twist the carby off the coupling.
5. Dissasemble the carby following the G4 carby instructions found in your manuals section.
6. Report my findings/questions in my previous post.

Everything else is completely untouched

cheers2

James

Joined: Dec 1999
Posts: 5,334
Likes: 30
Repair Junkie
****
James,

1. Check the 'O'rings on the block(make sure they have no damage). crazy

2.Check the cable is properly inserted into the cam. grin

3. Replace the grommet. yay

4. Did you take the starter off? confused


Regards,
[Linked Image]

Bruce


Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.
Joined: Apr 2006
Posts: 30
jamesl Offline OP
Novice
Hi Bruce,

O-ring is in good condition. I did not take the starter off (assuming you meant the starter cord assembly as my model does not have an easy start decompressor?).

Do you think the dislocated diaphragm could have caused the irradic throttle behaviour?

cheers2

James

Joined: Dec 1999
Posts: 5,334
Likes: 30
Repair Junkie
****
James,

I said 'O'Ring's. Please check the other one on the block(remove the two screws and slide off). banghead

Yes the diaphragm will cause part of the problem. Make sure that you follow assemble directions as per manual. cheers2


Regards,
[Linked Image]

Bruce


Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.
Joined: Apr 2006
Posts: 30
jamesl Offline OP
Novice
Hi Bruce,

O-ring's both in good order. I have assembled the carby as per instructions and it seems to be back to normal. smile

BTW: It has always (since brand new) had a bit of a dead spot when working through the throttle range i.e. when the throttle is at the start position it idles, then if you push the throttle about another 1cm forward and leave it there, the revs die back and it will struggle and stop. If you avoid this point and push it just a fraction past this point it idles and as you move the throttle though to maximum the revs increase smoothly. It doesn't really bother me ... I am just interested to see if you have seen this before?

I have not changed the throttle cable/throttle lever in any way (except replacing the air filter cartridge).

cheers2

James

Joined: Dec 1999
Posts: 5,334
Likes: 30
Repair Junkie
****
James,

Does the machine blow much smoke in that position?

Have you checked the ring gap?

Does the carby have a white or black valve? cheers2


Regards,
[Linked Image]

Bruce


Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.
Joined: Apr 2006
Posts: 30
jamesl Offline OP
Novice
Hi Bruce,

No it doesn't blow much smoke at that position, it just seems to idle too low.

I have not checked the ring gap (head has never been off).

The valve is white ... I turned position 'C' on the valve to the jet as described in the instructions.

cheers2

James

Joined: Dec 2002
Posts: 127
Victa Mower Specialist
James,

Have you tried changing the springs on the diaphragm? :Wavey:


Regards,

Victa Man
Joined: Apr 2006
Posts: 30
jamesl Offline OP
Novice
Hi Bruce,

No ... I did not realise the springs wore out ... okay will give that a go.

Thankyou for all your help.

cheers2

James


Moderated by  bigted, Bruce, CyberJack, Gadge, Mr Davis 

Link Copied to Clipboard
Newest Members
Armstrong, kindkong, Painey, Tas, Justin Phillips
16,784 Registered Users
Forum Statistics
Forums145
Topics12,710
Posts104,596
Members16,784
Most Online2,545
Dec 23rd, 2019
OutdoorKing Showcase
20 Bucks from FB Marketplace
20 Bucks from FB Marketplace
by Return Rider, February 20
Victa Cortina 2 Shed Find
Victa Cortina 2 Shed Find
by Return Rider, January 25
My Rover Baron 45
My Rover Baron 45
by Maxwell_Rover_Baron, April 16
SHOWCASE - Precision Mowers - 2021
SHOWCASE - Precision Mowers - 2021
by CyberJack, April 14
SHOWCASE – Atco Rotary – Paul C - 2020
SHOWCASE – Atco Rotary – Paul C - 2020
by CyberJack, December 28
HOME |CONTACT US
Powered by UBB.threads™ PHP Forum Software 7.7.5
(Release build 20201027)
Responsive Width:

PHP: 7.4.33 Page Time: 0.023s Queries: 37 (0.017s) Memory: 0.7201 MB (Peak: 0.7901 MB) Data Comp: Zlib Server Time: 2024-04-20 08:13:58 UTC
Valid HTML 5 and Valid CSS