OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Victa Two Stroke Engines Victa Carb

Hi
I have a Victa VSX160 here in the UK The problem I have is that I have rebuilt the
carb It starts first time with a shot of easy start but then dies I think everything is back as it should be.
Fuel is getting into the carb
Spark is good
New petrol tank tap and pipe
New Carb front(white with primer button)
The throttle is back as it should be I think
At first when I used throttle with the carb loose after the build up I could not see the white round plastic disc move as the throttle was used. I stretched the spring a little and it then could be seen to move
Which way up should the diaphragm? go I have it with the flat side up is this right?

It feels as if the fuel is not being pulled into the cylinder at all

Any advice would be appreciated

Thanks Dennis

Hey there ,
Could you post some pic's of your mower please , Victa made so many models and the name may be different to what the vsx 160 is in Australia..

anyway it sounds like you have a victa power torque engine made from 1980's - present
normally when a simple carburetor clean/rebuild fails it normally means the o-ring under the pull starter has failed it can also cause the engine to over rev and not idol
remove the plastic cowl off the top of the engine remove the 3 bolts and remove the starter. (starter is the top of the crankcase)
replace the o-ring with a genuine victa part . and this should fix your issue.
cheers, tomo

Hi there Dennis, welcome aboard and yes, the diaphragm goes flat side up. Are there any obvious leaks around the primer face? It's odd that fuel is getting into the carby but it's not drawing it through and running, even after you spray start the motor.
Which spring did you stretch?, theres only 2, the short one under the diapragm and the long one above the diapragm.
Here are a few simple checks:
Is the carb leaking?
Is the primer face the right way up?
Is the needle in place?
Is the jet blocked?
Is the lifter (the 3 pronged plastic part under the diaphragm) the right way up?
Posting a few close ups of the carb will also help.
Cheers and good luck

Hi

It took me a while to work out how to reply!

I will get some shots and post them tomorrow, I was sure all was as it should be but I must have got something wrong.

Thanks for your help

Regards Dennis

Hi

I have stripped and rebuilt the carb many times now and everything looks exactly as it should, however when I looked at the exploded drawing of the carb I saw that I was missing the washer under the cam, could this be the problem? Does this washer provide a seal so that the engine will suck fuel?
I am not giving in but I am now struggling!
The engine starts every time but will not run, moving the control makes no difference the engine always dies after starting

Thanks Dennis

It's possible you could have a problem with the fuel cap as I have this problem before. Just check your fuel cap. There is a small breather hole make sure that's not blocked as if is blocked fuel will get to the carby but won't go any further due to air not being able to get in. Therefore blocking the whole fuel system.

Hi
I thought this is it but no cap is clear, started without cap and then died dammit!

Thanks Dennis

Does the fuel flow out of the tap and down the hose freely? It does sound like a fuel blockage.Did you put the needle back in the wrong way? I have seen a few where it has been put back in the wrong way and will cause this problem.Another thing you can try which will help in the diagnosing.Once it starts see if you can keep it going by pressing the primer bulb.If it does continue by doing that then yes it will be a carby problem.Don't panic or give up we will get to the bottom of it.It is just a little harder when it's not in front of you.You being me or us that is.

Hi

I thought 'ah the cap' checked it and clear, Tried it without cap, started first pull and then died.
Could the missing washer be the problem?

Thanks Dennis

Hi

Another thought


I was looking on a lawnmower repair co's site from Australia.It lists HA25363A
seal (Suits Victa 2 stroke engines fitted with plastic intake manifold. Installed on outer surface of intake manifold. Replaces OEM Number HA25363A)
I am sure this is there on the plastic locking part of the intake manifold.

It also lists

CR03400A
Intake manifold inner o-ring (cylinder block side)o-ring
Suits Victa 2 stroke engines fitted with plastic intake manifold. Installed between the cylinder block and intake manifold. Replaces OEM Number CR03600A

I do not think that CR03400A is there, is there a drawing available of the position of the 'O' rings.

If CR03400A was not in place would it allow air to be drawn in from outside and not through the carb?

Thanks again

Did you try what I had put in the last post? Maybe some pictures if you could put some up would help.

Hi

yes I tried the cap and also tried it without cap at all no change
I will get some shots and post

Thanks Dennis

Did you try pressing the primer bulb after it started to see if you could keep it running?

Hi

Just tried it, I can make it run of sorts when I continually press the primer, it always starts pretty much first time but will not run on its own

Thanks Dennis

OK it's possible that needle is either in the wrong way or is getting stuck. I have had a few that the needle seems alright but in fact just wouldn't move to allow fuel through.You could pull the face off and keep it together as if it were together move the float up and down (Not to far) and see if the needle comes out freely on its own.If it doesn't or comes out slowly or staggers out like it is drunk (Well it maybe high off the fuel) then that could well be the problem. Either way that proves to me that it is a carby issue.

Hi
The mower is now going!
I brought from ebay here in the UK a spares Victa with a plastic carb
I stripped it cleaned it put it on and it started and ran almost first time.
I have got used to stripping them now! the only differences I could see is that I had definitely stretched the long spring that goes on top of the diaphragm , would this be critical?
I am going to get another spring and diaphragm and rebuild the original carb and fit it to the ebay mower and investigate further, I will post the result
Thank you all for your help it is much appreciated
Dennis

Well done Dennis good work I knew you could do it. That spring certainly can make a different's to the running of the carby I couldn't see it wasn't allowing it to start but maybe it was stretched way to far. Then it would push hard on the diaphragm and maybe kept the poppet valve open all the time. That could affect it.

Flat side up for the diaphragm is correct, the lifter (3 pronged jig) has this side down written on it so you wont have got it wrong. Almost sounds like the float has moved and jammed in the up position when you put the primer cap on.

Small spring between the lifter and diaphragm and larger spring between the diaphragm and clip on end cap.

Primer cap has a horizontal line that needs to be horizontal but you probably already know that.

Poppet valve should have the letter "C" facing the spray hole. Probably wouldn't result in it not running but does vary the mixture (this is assuming your poppet is white, the black ones are not adjustable)

Another possibility is the jet is blocked, this is also the primer cap retaining screw.

Other then that I'm all out of ideas.