42 in. Deck 19.5hp Lawn Tractor

Experienced gardeners share their insights in answering this question :
Post the model and type please.

How to Identify and Fix Common Gardening Problems ?

We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :

Take a look at the blade under the mower deck. Sometimes the knocking sound you hear could be the result of a loose, bent or wobbling blade. If you`ve recently removed or replaced the blade and it suddenly started knocking, this is quite possibly the cause of your issue.
The mower surges when the carburetor sucks air through an unsealed gap in the air intake manifold instead of through the air filter. Dirty carburetor. Clogged fuel jets inside the carburetor commonly cause the lawn mower engine to surge. Clogged jets can`t provide the right mix of air and fuel to the engine.
Engine knocking may be caused by worn-out engine bearings. If the bearings are worn, they will not be able to support the weight of the engine, which can cause it to knock. Replacing the bearings may fix the issue.
One of the most common causes of engine knocking noise in a car is worn out spark plugs. As spark plugs get older, they can become fouled with deposits from the combustion chamber. This can cause the spark plugs to misfire, which will result in engine knocking noise.
The problem may involve an annoying change (up/down) of engine speed while cruising at a steady pace, a low drop (or even cut-out) at idle or when approaching a stop, a wild high engine speed of several thousand rpm followed by a drop to near zero, etc.
If your lawnmower`s engine is surging it could be a problem with the carburetor. The carburetor mixes air and fuel to the perfect ratio for combustion. There are passages and nozzles (called jets) that route the fuel through the carburetor. The jets meter the precise amount of fuel that is needed for combustion.
Engine knocking often occurs when the air-fuel mixture is incorrect. To counter this, you can add an octane booster in the mix. This can help ensure proper octane rating, which can then stop the knocking. The recommended minimum octane level in the US is 87.
Knock knees usually gets better as children grow and their legs straighten. Most children do not need any treatment, but sometimes physiotherapy or treatment from a foot specialist (podiatrist) may be recommended.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Help with the lawnmower. It starts and stalls after a few seconds
ANSWER : Check the fuel system clean the carb .

What would cause mower to die after starting?
ANSWER : Your carb. is gunked up. get a can of starter fluid and a helper. have the helper spray some starter fluid into the air intake to keep it running after it starts. Once it runs for a couple of minutes it will be ok. J.

Briggs and stratton 5 hp engine won't start – Parks Optical Briggs And Stratton Engine Intek 10.5hp Lawn Mower
ANSWER : An engine not starting can have many causes but it is usually due to lack of fuel being sucked into the engine or no spark.Remove spark plug. It should be damp, if it is wet, the engine has been flooded and should be left for a few minutes for the fuel to evaporate. Replace lead on the plug and hold the threaded part against the engine somehow. Make sure you don’t hold the lead in your hand!Pull start the engine and ensure there is a spark.

Hi there, quick question, there is a black and grey wire on the 13.5hp briggs and stratton, i am unsure which is the earth and which is the power?
ANSWER : The grey one should get power when the key is turned on. This opens the solenoid valve on the carb and lets fuel in. The black one should get earthed when the key is turned off, this shorts out the coil and stops the spark. Aussie Steve.

My Briggs & Stratton gives off a puff of blue smoke when I first start it. When in idle it will REV up & down and give an ocassional backfire.
ANSWER : Sounds like you may have too much oil in the engine. Check your oil level.

Won’t crank over seems like to much compression ?
ANSWER : OHV? First try adjusting the valves too much clearance will the decompressor to not work. Now the decompressor can also fail but try the valve adjustment first.

I have a briggs and strattan 18 horsepower engine on my craftsman mower and it wont start, i replaced the starter and it still wont start! It wont even turn over, in fact it binds the starter, but if I take the spark plug out and try to start it, the starter engages and turns the motor over just fine but of course it wont start cause the spark plug is out! Whats the problem?
ANSWER : Set intake valves @ .004 and exhuats @ .006 with piston a 1/4 inch downstroke from TDC.It sounds like the ACR {automatic compression release}is not working do to valves having to much lash.

17hp b/s intek OHV after 30 min mowing starts running rough
ANSWER : If gas is in the oil the needle and seat in the carb are bad or some thing in it. the gas will go in to the crank case and load the cylinder with gas. you can take the carb apart to see if something is in the seat. or replace the carb