Problems in the Fuel System
Check and clean the vent. Surging is also caused by water that got into the fuel. A mower left in a heavy rain or condensation on a hot summer day can choke the engine. Empty the gas tank, properly dispose of the old fuel and try a fresh batch of gasoline.
Why is my Craftsman lawnmower surging?
Problems in the Fuel System
Check and clean the vent. Surging is also caused by water that got into the fuel. A mower left in a heavy rain or condensation on a hot summer day can choke the engine. Empty the gas tank, properly dispose of the old fuel and try a fresh batch of gasoline.
How do you set the timing on a riding lawn mower?
Why does my Craftsman lawn mower keep shutting off?
A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time
. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall.
Is there timing on a lawn mower?
You don't adjust the timing on a lawnmower engine like you do an automobile.
The timing gear meshes with the cam gear with a timing mark and that is the only timing there is
. If the timing is off either the timing gear has spun on the shaft or the flywheel is not positioned on the crankshaft correctly.
How do you adjust the carburetor on a Craftsman lawn mower?
- Locate the carburetor on your Craftsman equipment. …
- Turn the main mixture and idle mixture screws on the carburetor counterclockwise about one full turn with a flat-head screwdriver. …
- Rotate the throttle control screw clockwise until the engine begins to sputter.
How do you check the timing on a Briggs and Stratton engine?
How do you adjust the timing on a Briggs and Stratton engine?
The crankshaft must be installed into the lower engine cavity first. Slip the bearing end of the camshaft gear into the bearing hole. The camshaft gear will have the round indentation stamp on the end of the gear. Rotate both the camshaft gear and the crankshaft simultaneously to align the two timing marks.
How do you adjust timing on a small engine?
Why is lawn mower revving up and down?
The lawnmower may rev up and down
if the spark plug is damaged or having an unbalanced adjustment
. You want to make sure the cables connected to the spark plug don't become loose and move unsteadily in a particular direction. Apart from that, check inside the spark plug if there are any corrosion build-up issues.
Why does my riding lawn mower idle up and down?
Carburetor Adjustment
A carburetor that's incorrectly adjusted is a common cause of poor engine idling that results in hunting and surging
. Fortunately, most lawnmowers have two screws that allow you to adjust the carburetor yourself. One screw controls the idle speed while the other adjusts the idle mixture.
What causes a lawn mower to surge up and down?
The most common reason for a surging lawn mower engine is a
blockage in the fuel supply
, but there are other possibilities: Bad gas. Bad spark plug. Dirty / faulty carburetor.
Why does my lawn mower shut off after a few minutes?
As the fuel level drops, a vacuum begins to form in the fuel tank because air can get in to fill the space the consumed fuel occupied.
After about 10 or 15 minutes, the vacuum will become strong enough that fuel will stop flowing to the carburetor and the lawnmower will die
.
Why does my riding lawn mower shut off while mowing?
Being Overworked
. One of the most common reasons that a lawn mower might stall while it is cutting grass is that it is being overworked. This is a mechanism that is intentionally incorporated into the mower to prevent the motor from being blown.
Why does my riding lawn mower keep dying?
For example, if your lawnmower keeps dying, then
your fuel may be old
. Old and bad fuel can lead to a gum residue in your carburettor. You can prevent this from becoming a problem by emptying the tank of fuel before storing it for long periods. Alternatively, add a fuel stabiliser product.
How do you set a camshaft and crankshaft timing?
What do timing marks mean?
A timing mark is
an indicator used for setting the timing of the ignition system of an engine
, typically found on the crankshaft pulley (as pictured) or the flywheel, being the largest radius rotating at crankshaft speed and therefore the place where marks at one degree intervals will be farthest apart.
How do you adjust a lawn mower valve?
How do you adjust a Craftsman carburetor?
How do you adjust the governor on a Craftsman lawn mower?
It bears a distinct, bowl shape that is easily recognizable compared to the rest of the engine. The governor's rod extends into an eyelet on the carburetor.
Pull the rod out of this eyelet
. This will adjust the governor and allow your Craftsman mower to run at a higher, ungoverned speed.
How do you know if your carburetor needs cleaning?
- It just won't start. If your engine turns over or cranks, but doesn't start, it could be due to a dirty carburetor. …
- It's running lean. An engine “runs lean” when the balance of fuel and air gets thrown off. …
- It's running rich. …
- It's flooded.
How do you check valve timing?
Begin with the intake valve; slowly turn the crank clockwise until the lifter rises 0.050 inch. Stop turning the crank and read the degree wheel. This begins duration at 0.050 inch. If our cam card says the intake valve opens at 31 degrees BTDC, the degree wheel should show 31 degrees BTDC at this time.
