On a kawasaki 48" walk behing mower engines. Runs fine for a few minutes then stalls.
Changed Gas filter, Air cleaners, and today installed new carb. No improvement.
Would aprediate any advice.
Diagnose the problem throwing parts at it can get expensive. You need fuel compression and fire at the right time to run. A set of neon spark testers in a situation like this really are helpful. Pretty cheap at Harbor Freight. If you have fire when it dies try giving it a shot of Gumout carb cleaner and see if it runs on that.
Really don't think valve lash would cause one to quit if it starts to begin with.
#6
sgkent
suggest either a new mower or take it to a shop. Throwing parts at it can not only get more expensive than a shop but it can create lots of secondary problems.
It takes 3 things for an engine to run right
Fuel to air mixture
Spark at the right time
Compression.
One of those 3 is missing when it dies, The burden is on whomever is repairing it to figure which one is missing. Only then can someone fix it. Could be as simple as a bad ignition switch on the unit if it has one. Or a chaffed wire that shorts out when you turn it a certain way 10 minutes into the mow.
It does because enough fuel remains in the cylinder to burn when the fuel supply is enriched but when the choke closes or the revs increase there is not enough to sustain combustion.
#8
Scrubcadet10
verify fuel flow to the carburetor, if you get debris in the tank or in some cases, if the tank vents through the cap, it will stop fuel flow after a short period.
On a kawasaki 48" walk behing mower engines. Runs fine for a few minutes then stalls.
Changed Gas filter, Air cleaners, and today installed new carb. No improvement.
Would aprediate any advice.
Will it start right back up or does it need to sit a while before it will start again?
I just noticed you started another thread on this same issue earlier in the week and from that description I may be thinking something different than you about stall. Does it just start running like it's lacking power or does it actually stop running?
At first if sounds and feels like it is loosing power than dies. It starts up again to make it into garage. I just noticed that when I disconnected fuel hose and opened 'fuel shut off' valve just a trickle of fuel came out. That may explain why it just barely runs then dies. I just ordered new valve and should arrive today.
At first if sounds and feels like it is loosing power than dies. It starts up again to make it into garage. I just noticed that when I disconnected fuel hose and opened 'fuel shut off' valve just a trickle of fuel came out. That may explain why it just barely runs then dies. I just ordered new valve and should arrive today.
If you’re only getting a trickle of fuel, you may have debris clogging the fuel inlet in the fuel tank. I’ve had it happen numerous times. Blow compressed air back up the fuel hose into the tank. If there is something in there, you’ll see it in the tank. Don’t blow in there too hard or you’ll get fuel everywhere.
What’s happening is it’s drawing fuel and that debris into the fuel line, the engine uses up what it can until a vacuum forms. When the engine dies and the vacuum releases, the debris floats back up into the fuel tank and more fuel flows back into the fuel line. When you start it back up the debris goes back into the fuel line and you get the same process.
Hope this helps.
What about a sticking float in the carb bowl? Sounds like it uses up what's in the bowl, then the float sticks in the up position. A bumpy push to the garage may be enough to unstuck the float. Or there is debris in the bowl. Just my 2 cents.
On a kawasaki 48" walk behing mower engines. Runs fine for a few minutes then stalls.
Changed Gas filter, Air cleaners, and today installed new carb. No improvement.
Would aprediate any advice.
Try running it with the fuel tank cap loosened to rule out the possibility that the vent isn't allowing air into the tank as the fuel level drops. If so, a vacuum forms in the tank and fuel flow into the carb bowl is gradually reduced until the engine stops. It is simple to test and costs nothing, unless it is causing the problem.
Thanks for the responses. It is fixed. It was the 'Fuel shut off' Valve that was clogged. It is the one just below the Fuel tank. I removed it from tank, and when I blew into it I noticed it was not letting air pass. So I unclogged it, replaced it, and mower is running fine. I had replaced Carb, checked Gas cap, and Fuel Filter. Thanks again for the many responses. I came very close to having it taken in to have it serviced.
verify fuel flow to the carburetor, if you get debris in the tank or in some cases, if the tank vents through the cap, it will stop fuel flow after a short period.
I agree, I have a Ferris Pro S that acted the same way. Tried a bunch of things, finally blew back into the tank & it’s working like it did when it was new. Had to be tank fuel filter.
Great mower, poor design gas tank. Should have been 2 tanks, even if it didn’t look quit as fancy.
I purchased it for what it was capable of doing, not how it looked.
His symptoms could be the same as yours but his problem could be totally different
So how about you starting a new thread with your mower & engine make & model numbers plus your symptoms & what you have already done
It is free .
Some tanks have a filter in the stem coming out. If that is plugged, fuel flow will be comprimised. or if a leaf or debris pushes op against it it to can reduce fuel flow. It's always a good idea to clean out the fuel tank and make sure you have good fuel flow.
Another possibility is a coil on it's way out. If it starts , once warm it dies it could be a coil problem. Put a spark tester between the spark plug and the coil wire and see if the spark is reduced in power or consistency.
If neither is your problem, take the carb apart and check the main jets opening. Unleaded gas after 3months time degrades and will clode the openings in the carbs jets and veigns. you can use a torch-tip wire cleaner to open up the opening in the main jet. I hope this helps
