Tip & How-To about Garden

Small engine carburetors. mower, weed eater, ect.

I have found out that if a small engine has spark but does not run. if you take the carburetor off and clean it. it will run perfect. i have fixed hundreds of them. it is a very common problem because the dirt and dust that is sucked into the carburetor when mowing it just gets plugged up. or bad gas or even water. i had to ask questions and learned the hard way just like a lot of people. but if your mower wont run or surges when running. try this and save a lot of money. just be careful with the small parts. there are a lot of videos on you tube that show this simple procedure.

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Why does my redmax ebz8500 blower start fine and run fine for a few minutes and then bog down and rev back up? The carburetor, air filter, fuel filter, fuel lines and spark plug are all brand new.


Based on the majority of small 2-cycle engines out there, I would suggest rebuilding the carburetor. It's easy to do and kits are usually $10 to $12. Remove the air filter and retrieve the number printed on the carburetor. Then, look on eBay or visit a local small engine repair shop for parts. Remarkably, there are a very small number of carburetors used on a majority of different brands with 2-stroke engines. So, if you buy a kit based on the carburetor number, don't worry if it's not directly referenced to your particular brand of blower.

Sometimes, you can get positive results by partially disassembling a carburetor and cleaning it with spray carburetor cleaner from Walmart or Auto Parts Supply store. But, if you're going to that much trouble, you might as well replace parts as you go. Over time, rubber seals dry out and plastic reed valves leak by. Recently, my chain saw was acting up. I replaced hoses, filters, spark plug, etc. Even flushed the carburetor with cleaner. Nothing helped. But, once the carburetor was rebuilt, it purred like a kitten. I've experienced the same thing with weed-eaters and other engines, too. Fortunately, 2-cycle engines are not complex and usually easy to fix. Good luck!

May 05, 2014 | Garden

1 Answer

Masport 635 starts, revs up once, and dies. Will start again a few pulls later. Carb diaphragm has been replaced with no change. Could it be ignition? Thanks.


follow this steps and fix it. God bless you


Carburetor

If the lawn mower engine stops after a few seconds, the carburetor might be clogged or have bad fuel in the float bowl. If old fuel was left in the lawn mower for a long time some of the volatile ingredients may have evaporated, leaving a thicker, stickier product that is more like varnish or shellac. This sticky fuel can clog up the small jets and ports in the carburetor and it can be difficult to burn allowing the engine to only run for a few seconds. The only solution is to drain the old fuel from the float bowl and thoroughly clean the carburetor with carburetor cleaner. If that isn't effective, replace the entire carburetor.


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Carburetor Kit

If the engine stops after a few seconds it may not be getting enough fuel. The engine needs air, fuel and spark to maintain operation. The carburetor has two inputs, fuel from the gas tank and air through the air filter. The carburetor is designed to mix the air and fuel in a consistent ratio so that the engine can run continuously. If the carburetor is not getting enough air or fuel, or if the fuel is blocked inside the carburetor the engine stops after a few seconds. Rebuild the carburetor with this carburetor kit.





Gas Cap

If the lawn mower engine stops after a few seconds and then stops running, the gas cap might be defective. All gas caps have a small vent to allow air back into the tank when the engine is running - otherwise as gas is drawn from the tank it would create a vacuum. The vent can be difficult to see and there are many different types of vent. If loosening the gas cap a little allows the engine to stay running, replace the gas cap. It's sometimes possible to clean the vent, but on most newer engines the vent cannot be cleaned, it should be replaced.





Gas Cap with Gauge

If the lawn mower engine stops after a few seconds and then stops running, the gas cap with gauge might be defective. All gas caps have a small vent to allow air back into the tank when the engine is running - otherwise as gas is drawn from the tank it would create a vacuum. The vent can be difficult to see and there are many different types of vent. If loosening the gas cap a little allows the engine to stay running, replace the gas cap. It's sometimes possible to clean the vent, but on most newer engines the vent cannot be cleaned, it has to be replaced.





Old or Bad Gasoline

If the lawn mower stops after a few seconds, the carburetor might be clogged or have old or bad fuel in the float bowl. If old fuel was left in the lawn mower for a long time some of the volatile ingredients may have evaporated, leaving a thicker, stickier product that is more like varnish or shellac. This old or bad fuel can clog up the small jets and ports in the carburetor and it can be difficult to burn allowing the engine to only run for a few seconds. The only solution is to drain the old or bad fuel from the float bowl and thoroughly clean the carburetor with carburetor cleaner. If that isn't effective, replace the entire carburetor.


Spark Plug

If the lawn mower engine stops after a few seconds the spark plug might be defective. All small engines have an ignition coil. The coil is the device that provides spark for the spark plug(s). If the coil is bad there won't be spark to the plug(s). The coil is essentially a small, induction generator. It is mounted next to the flywheel. The flywheel has one or more strong, embedded magnets. As the flywheel spins, the magnet(s) zip past the induction coil, this action of a magnet passing past a coil induces a voltage. Depending on the design of the coil and the strength of the magnets, a stronger or weaker spark can be created and delivered to the spark plug(s). Each time the flywheel spins around a spark is generated. The best way to test a spark plug is to use a spark plug tester. The spark plug should have a strong, visible spark between the electrodes when the engine is cranking. If it doesn't, replace it.

Nov 13, 2013 | Garden

1 Answer

My troy built 2200 pressure washer was running fine but then shut off instantly I then noticed it had low oil I filled it but now it won't start


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Pressure washer takes oil in two places:
Pump oil is 20-30 weight SAE non detergent and comes half way up/ do not fill more than 1/2 way
Engine oil is 10W30 and comes half way up dip stick
IF you overfilled the oil >>> DO NOT turn power washer on it's side or upside down to drain oil >>> because engine oil will fill carburetor

When engine won't start
We pull off air filter so we have direct access to carburetor
Spray WD-40 into carburetor while starting
The engine will fire on the WD-40

You can keep spraying WD-40 into carburetor to keep engine running while moving choke to see if engine will run on it's own
Squeeze gun trigger so water comes out gun and pump pressure doesn't stop engine

If engine will not fire on WD-40
Spark is suspect
Your spark plug gets power from ignition coil
If coil is bad you get no spark > and coil needs needs replacement
Take out spark plug, clean it with WD-40 and use a bit of sandpaper in the spark gap
Put spark wire back on plug
Touch threads of spark plug to metal part of engine > pull cord and look for sparking between spark plug and engine
If you do NOT have any sparking, then coil is bad
If you HAVE spark, then your spark plug needs cleaning or replacement

If engine fires on WD-40 but will not keep running
Then either fuel or carburetor are suspect
Loosen hex nut on fuel filter located below gas tank >> if fuel flows, then re-tighten hex
Next, pull off rubber hose connected to carburetor to see if fuel flows to carburetor
If fuel is flowing to carburetor, then the carburetor is suspect.
Small engine repair shop will have carburetor cleaners

Check exhaust
There is a screen over exhaust
Make sure it is clean of carbon build-up > Use WD-40

Change air filter

Oct 12, 2010 | Briggs & Stratton Garden

1 Answer

Snowthrower. Won't even fire. Can I just clean carburetor?


See my tip on diagnosing small engines. It works for 2-stroke or 4-stroke engines.
It is best not to use starter fluid. Aerosol carb cleaner is what I use.

Jan 02, 2010 | Toro Lawn Mower With Toro Power Tools

2 Answers

The leaf blower won't start and I did change the spark plug and last time it run for like 30 sec. before it shut down again.


Main cause of small gasoline engine failure is carburetor clogged. Try spraying carburetor cleaner into carburetor and intake. Check if unit has air cleaner. If engine starts briefly with cleaner then carburetor needs manual cleaning. Carburetor removal and overhaul.

Jul 10, 2009 | Poulan/Weed Eater No. Bvm200le 711482 24cc...

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