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Victa carburetor problems

I have a 6 cylinder car carby fitted to a victa push mower, with reduction in air inlet & manifold sizes. mower starts ok no fuel supply problems but will only run on full choke. Any suggestions/solutions ?

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  • Contributor
  • 23 Answers

Why you have a car carburetor fitted to a mower troubles me... I think you'll find you don't gain any power increases by having such a large carbie on there, if anything you'll simply flood the engine with air or fuel and will have great difficulty maintaining a stoichiometric ratio.

The fact that the motor will only run on choke indicated that it is getting too much air without choke, and not enough fuel. This would be due to the intake size being still too large and probably a restriction in the venturi flow near the jets causing lack of suction to draw fuel from the bowl which would be due to the mower engine not creating the same vacuum as a car engine.

My honest suggestion?
Put a Victa carbie back on it, it's probably not going to work...
If you want it to run harder, adjust the throttle assembly to rev harder, or change the governor position.

Posted on Nov 19, 2013

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Posted on Jan 02, 2017

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steve_lima
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SOURCE: I have a Brigs&Straton 6.5 Quantum lawnmower will not stay running. I can keep it running by restricting the amount of air entering the carb with my finger (choking it) The mower will start if it

the problem is in your carb.,at the bottem of the carb. there is a bolt that threads in to the carb.pinch off the fuel line so that no fuel comes out after the fuel bowl is off the mower.now look into the bolt that you took off.there should be a hole oppisit the head of the bolt.there are also two holes that go through the sides.these holes are the fuel intake to the carb,the hole in the center is the fuel nozzle.most likely you have dirt blocking this hole and not letting the motor get enough fuel to run.thake some carb cleaner and spray it in the hole.take an air hose then blow the nozzle out.while you have the screw out take the bowl off and check to see if there is any water or dirt in the bowl.after cleaning.reinstall the bowl and start mower again.should be running ok now.if not let me know and i'll guide you through another fix.let me know if this helped or not................

Posted on Jun 02, 2009

#1 Taper
  • 1040 Answers

SOURCE: Engine only runs with choke full on. Dies when off full choke.

Hi Dave, it sounds crazy, but try this. Check your gas cap. It could be clogged, causing a vacuum to occur in the tank, and therefore not allowing the carb. to take on gas. It usually take 10-15 min. for this to occur. The next time you run the mower and it starts to stall out, loosen the gas cap and see if it begins to run again. If it does, then you know that the gas cap is clogged.

Jim

Posted on Jun 05, 2009

blown725
  • 15 Answers

SOURCE: My Honda 160 push mower starts and then runs rough

take off the bowl of carb....the main jet is clogged ....remove it with a screwdriver...a small piece of wire will work as something to clean it out.....clean the whole carb....fixed many of them...

Posted on Aug 24, 2009

  • 138 Answers

SOURCE: Mower starts, but dies immediately

that's not a choke lever, it's used as a speed control on some models. the two springs are attached to the governor rod, which is attached to an "air vane" governor - on these engines, you need to keep the gas tank fairly full at all times, the dip tube on the carburetor rides up off the bottom of the gas tank, if fuel level goes lower than this tube, it won't pull any gas to the intake - from your descriptions, though, it sounds like the diapragm between the carb and gas tank has "curled". briggs had a service flash on the problem and since it's new, you should take it to a shop that does briggs warranty work - it should be covered under warranty

Posted on Aug 28, 2009

SOURCE: mower engine backfires through air filter! will

A: Backfiring (and misfiring in general) can be caused by a large number of problems; unfortunately not only you do not even say what kind of Fulvia you have but your description of backfiring is superficial. You certainly have not attempted to exclude some obvious causes of backfiring. With these limitations I can only try to list a number of potential causes and how to solve them.

  1. None of the things you have done (plugs, cables, alternator, filters etc)has anything to do with backfiring. I am not surprised that no improvement was obtained.
  2. You must check that the valve timing is correct and that the timing chain has not jumped one tooth of the camshaft sprockets (details will depend on the car engine). Ensure also that the valve clearance is not badly out.
  3. You must check that the ignition timing is neither too advanced nor too retarded and that the correct dwell angle is set with respect to the points opening gap (details depend on the engine).
  4. It is unlikely that the problem is due to carburettor malfunction: however, check that the two carb floats are OK if everything else seems fine. I presume that by inspecting the spark plugs you concluded that the carb air/fuel mixture was basically correct.
  5. A leak in the intake system can cause backfiring but you do not even say if your car has a brake servo (some Fulvias did not have one). It is very unlikely that the servo is causing your problem since you would notice that a strong effort is needed to stop the car and that the same amount of brake pedal pressure can be applied with the engine running or switched off. It is possible, that the vacuuum hose running from the cylinder head to the servo (or its one-way valve) is damaged: a crack in the vacuum hose occurs very often although I have not seen it to produce symptoms as bad as the ones you describe. Any vacuum hose (with suitably rigid wall) of the same diameter will be OK to replace yours: it does not have to be a Lancia product.
  6. Your car may have a leak either in the carburettor rubber support or in the intake manifold gasket.
  7. I do not know if the Polonez servo can fit your Fulvia. Reconditioned servos can be obtained from commercial suppliers but I suspect that the servo itself is not the cause of your problem.
  8. Poor throttle response (when everything is tuned up correctly) can be due to failure of the centrifugal advance mechanism in the distributor (broken springs, stuck bob-weights etc) or to inefficient acceleration pumps (holed diaphragm) at the bottom of the carbs. However, neither of these problems should create backfiring.
  9. Fulvias do not necessarily start instantly from cold because, if the car has not been used for some time, the carbs must be primed, a process which takes a bit of time as the fuel pump works while the engine is spinning. Some people have fitted an electric fuel pump to prime the carbs. Of course, using the choke will help starting from cold.
Finally, it could well be that, after you have identified and cured the problem, you must balance and tune the carbs. It is easy to blame carburettors for all sorts of misfiring problems: in practice, they are very robust and long lasting but they should be balanced properly by measuring simultaneously the vacuum created by each carb pair at the appropriate plug hole in the intake manifold.

Posted on Apr 08, 2010

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