Garden

After replacing the filter & plug, and adding fresh gas, my toro mower w/ a 6 hp Briggs engine just won’t run well. At idle and at speed, load or no load, it constantly varies in rpm and starts v. hard. Never a problem until this year, so I’m stumped, especially since I see no idle adjusting screw on the carb.Thanks in advance for any help or tips.Frank
Experienced gardeners share their insights in answering this question :
The reason it surges is it’s not getting enough gas, the gas is stale or has water in it. Unscrew the jet out of the bottom of the carburetor and clean it and allow the gas in the carb bowl to drain out. Refill with newly purchased gas and be aware that gas for small engines should not be kept more then 30-45 days. I work on these units for a living and 70% of what we see are fuel related issues.

Also, the choke should never be on all the time. If you have a primer on your motor, it’s doubtful you would have a choke. Perhaps you are looking at the throttle plate.

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 :

If the engine starts, but does not run smoothly, it means that the spark plug and ignition system are in order and you need to look elsewhere for the source of the problem. The usual culprit is air intake or fuel system related.
A dirty air filter is one of the most common causes of a poorly running lawn mower, since it starves the engine of the oxygen needed for combustion. Fuel Filter: Check the fuel filter on the mower to make sure it`s clean, and replace it if needed.
A Dirty Carburetor Can Cause a Lawnmower To Start Then Die

By far, the most common issue that causes a stalled motor is a dirty carburetor. The carburetor on your engine is the thing that draws in air and mixes it with the fuel. Contrary to what the movies might make you think, gasoline itself is not very flammable.

A difficult start could be due to a number of things, from a dying battery to a faulty starter. But if your vehicle has a hard time starting after sitting for just a few hours, it can cause an extra layer of confusion. When this happens, one of the most common causes is low fuel pressure.
If the heat riser is stuck in the closed position it will cause excessive heat under the carburetor and boil the fuel causing flooding and hard starting when the engine is hot. 3. When there is excessive fuel pressure. Excessive fuel pump pressure can be caused by a defective or worn out fuel pump.
Loose, Dirty or Disconnected Spark Plug in Your Lawn Mower: Check it out, clean off debris, re-connect and tighten. Dirty Air Filter: Clean or replace. Fuel Not Reaching the Engine: Tap the side of the carburetor to help the flow of gas. If this doesn`t work, you might need a new fuel filter.
Use Carburetor Cleaner

Fortunately, you can generally do this without even taking the carburetor out of the engine. Start by purchasing some commercial lawnmower carburetor cleanerOpens a new window, which comes in a simple spray can and will make it easy to clean the inside and outside of the carb.

Slow Cranking: For the starter to be cranking, the control circuit would have to be working. So, if battery and cable checks are within specification and the vehicle still cranks slowly, then it`s a slow cranking problem and it`s time to replace the starter.
If the level gets low, it can prevent proper lubrication of critical components inside the engine and cause starting problems, engine failure, and damage to critical components.
If the level gets low, it can prevent proper lubrication of critical components inside the engine and cause starting problems, engine failure, and damage to critical components.
Hard start symptoms and starter failure may NOT be caused by the starter, but could actually be caused by the crankshaft position sensor. If your vehicle is experiencing one or more of these symptoms, the crankshaft sensor may be at fault.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Does not run, will start with starting fluid – Mantis 2-Cycle Tiller
ANSWER : You should never use starting fluid on this model.

Add a couple of ounces of 100% acetone (available at Walmart) to some fresh fuel. Attempt to start for several pulls. Let sit for several minutes and repeat until it sounds like it wants to run.

Then watch this video and do it:

http://www.alamia.us/mantis_parts_s/148.htm

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Will only start and run in choked position, when throttle applied chokes out. If started with out choke and throttle position in low speed will start and run for 10 sec then like it runs out of gas.
ANSWER : I have your solution guaranteed, I fixed mine yesturday remove H L screw plastic caps and on high 11 threads exposed and on the low side 8 threads exposed. removing the plastic caps allows u further adjusting these wear out or move soo just take them things off and you will be rolling

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My stihl weed eater fs85 hard to start when hot
ANSWER : Try loosening the gas cap to relieve any pressure, then tightening it back up. Usually you will just need to barely unscrew it and then screw it back even before you pull the rope.

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Weed eater starts but won't stay running – Weedeater 19 in 25cc Gas Hedge Trimmer
ANSWER : Probably “gum” and “varnish” build-up clogging the TINY passages [called ‘galleries”] inside the carb!

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My poulan pro 42cc is hard to start ,,, its1 year old an i’m not sure if its worn out from alot of use or if its with the ignition
ANSWER : Throw it out and buy a new one this is a throw away scoiety we live in due to cheap *** chinese **** oh yeah go green

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Engine will crank with starting fluid, but dies.
ANSWER : Have you checked the spark plug and see if its clean and also check the fuel line and carburetor for clogs. And you can also check the air filter.

Hope you find this helpful.

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Lawn mower will start and run for 5 seconds and shut down
ANSWER : Will it stay running with your choke on? if so then clean your carb. if not then look for a blockage from tank to carb. ie fuel shut off, deteriorated fuel line. plugged filter etc

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Strimmer starts and runs but cuts out when at full power
ANSWER : Easiest place to look first would be to see if one of the fuel hoses has split. May be hard to see but that would cause it to **** air instead of fuel. Eventually, the split or hole would become so big that it wouldn’t stay running at all, and probably not even start. If that doesn’t do it, make sure the fuel you have is still good and try running a little Seafoam with the fuel and see if it clears up. After that, I would be looking at carefully cleaning the carburetor which may require dis-assembly as well as new gaskets etc.

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