20 Most Recent THQ The Lawnmower Man Questions & Answers

main jet blocked needs carby service its worth it

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I had the same problem; The first 2 years the engine ran fine and then the third year it started backfiring, so I put a new carburetor on my engine and the same thing happened. The real problem was the valves needed adjusted. Yes I know, this is very rare, but it did happen. I decided not to try this adjustment myself and opted for a mower shop to do it. It cost about $50.00 and the engine has been fine ever since.

try sanding ends of magnito and check the wire from magnito to sparkplug and see if its broke.

I have just had the same problem.. the steering shaft is held in place only by the deck sheet metal, which has worn & is now too big to hold the shaft in the correct position, funny how a $2 bearing would have prevented this from ruining an otherwise great mower. I'm going to take mine to a mower shop & hopefully they can install a bearing there.

it sounds like the carby main jet is blocked you real need to take it to a mover shop as It is a tricky think to clean out there are jets on them that are hard to find ,pin hole size

Should be in the manuel or type it into google etc.

Well it could be you jet which is in the carb this sprays the fuel into the System.. But yeh clean you carb or if you want to be lazy like me... Buy a new one they dont go for tht much.. So look around best place to start is ebay..
Cheers

Hi. Follow the wires from the oil sensor to the On off switcfh. It sounds like you have have a wire that is grounding as the plastic coating get hot. Check the black wire from the electronic ignition tie plug off the module to the oil sensor for signs of chaffing. If the problem persists try disconnection ONE wire from the oil sensor and see if it will start. If it starts then either the engine is low on oil or the oil level sensor is bad.

Thanks for using FixYa.

Kelly

Hi and welcome to FixYa. I am Kelly.
First I will list your engine parts manual here:

http://www.briggsandstratton.com/maint_repair/manual_and_more/docmanualdetails.aspx?showpdf=MS5449_LO.pdf

Now lets get your engine going correctly.

Hi and welcome to FixYa. I am Kelly.
This is how to clean the fuel passages in the carb.
Here is what you need to do:

1. Fuel selector off
2. Remove float bowl mounting screws and nut
3. Remove the BRASS Jet / Orifice in the very bottom of the venturi tube inside the pickup tube. (Flat blade screwdriver) Hold the Orifice up to the light. You should see a pinhole. If it is not clear clean the orifice but do not force anything through the hole.
4. Underneath the Orifice there is yet another BRASS tube that you need to remove. (Flat blade screwdriver) Make sure all of the holes in the tube are clear. The tube will be over 2 inches long. Clean it and reinstall it.
5. Reinstall the Orifice.
6. Using a catch fuel container turn on the fuel selector. Fuel should flow at a good rate. GENTLY lift the float assy level and make sure fuel flow shuts off. When you drop the float again fuel should flow.
If you do not have fuel flow at this point the needle and seat will need to be inspected. Fuel selector OFF.
(The following procedure is to be done only if there is no fuel flow with fuel selector on.)
a. Remove the silver float pivot pin retaining screw
b. Drop the Float down (The needle will come off with the float. NOTE the position)
c. Inspect the tapered rubber of the needle If should be pointed. If it is not pointed then the rubber tip is stuck inside the seat.
d. Clean the seat hole ONLY if obstructed. (Easily damaged)
e. FUEL Selector on then off fuel should rapidly flow through the needle seat.
f. Renistall Float and needle making sure to get the pivot / hinge pin installed correctly and reinstall the silver retaining screw.
g. Fuel selector ON. Raise and lower float checking for free movement and fuel flow.

7. If there still is no fuel flow at this point remove the fuel hose from the carb and check fuel flow. If no flow check that gas tank exit hole, fuel filter (if installed) and the selector valve assy for obstructions. Reassemble connections.

FUEL FLOW IS GOOD

8. BEFORE you install the float bowl inspect the bowl nut. There are 2 holes in the side of the nut where it screws in to the bottom of the carb that must be clear.

9. Install Float bowl mounting screws and nut. Check for leaks.

10. Test engine.

That should do it. (carb cleaning 101)

Thanks for using FixYa.

Kelly

google it