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I have a br 420c magnum blower and it will not stay running.... it acts like it is getting too much gas. i pulled muffler, spark arrester screen, i adjusted the idle, i adjusted the h and l screws nothing...

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H and L screws should be between 1.5 and 2 complete turns counter clockwise from where they lightly bottom out. if still no good, check diaphragm in carburetor on inlet needle side. it needs to be pliable and NOT laying on the inlet needle lever.

Posted on Sep 26, 2009


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My stihl fs400 strimmer starts first time and runs on full throttle then dies a few moments later starts first time and does ame thing again

inside the muffler there is a screen that gets all gummed up, take muffler assy. apart and clean screen, if you have a propane torch, this works well as you burn crud off it becomes ash and wipes or blows off. first link shows how.
press the helpful button and follow me on fixya

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What causes my 231 echo to lose power when i hit the throttle, changed sparkplug, filter plz somebody..

Robert - It sounds like your unit will crank and idle but does not want to run up when you give it some throttle. It sounds like to spark arrester screen behind the muffler may be clogged with carbon (which is a very common issue). The idle speed exhaust is getting out but not the amount of exhaust when you try to throttle up. Remove the bolts/screws that hold the muffler on. You will see a small square or rectangular screen at the exhaust opening. Remove it and hold it up to the light. If you cannot see light through the screen, it's probably clogged with carbon. Soak it in some lacquer thinner or some acetone to dissolve the carbon. Brush it with a wire brush if you have one. Recheck to see if the screen is clean of carbon. The object of the cleaning is to get the spark arrester screen to allow exhaust to exit the engine as you give it more throttle. The spark arrester screen catches red hot pieces of carbon that try to come out the exhaust and can, under the right conditions, set the grass on fire. If you live in an area that is prone to wild fires, make sure you clean or replace the spark arrester screen for your safety. Here is a tip: When you get you unit back to running good again, run the throttle at full speed when using the equipment. This helps to keep the carbon from building up on the spark arrester screen. Give this a try and stay safe :-)

Mar 07, 2015 | Echo Garden

1 Answer

Starts easily, but won't rev for 10 mintues. After warm, max speed is low / lacks power. New plug & gas filter

Check to see if the muffler is blocked.There is a screen (spark arrester) at muffler exhaust these get blocked. Usually 1 screw holding it in. Remove screen and replace or clean. I use bernzomatic torch to burn out these deposits.

Oct 01, 2010 | Husqvarna Forest & Garden 125bt Backpack...

1 Answer

When you first start the blower on choke then you mover the lever off choke it runs rough and has no power I just tuned it up last month

check carb adjustment screws. Also may have a blocked muffler. There is a spark arrester screen that becomes blocked. Usually 2 screws hold this in place at muffler exhaust, remove screen and use small tourch to burn it clean.

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2 Answers

My leaf blower will start but wont run when i give it gas it dies. Huskvarna 125B

fuel system needs cleaned
check fuel lines
remove carburetor for replacing diaphragms/gaskets

I’m happy to assist further over the phone at

Nov 08, 2009 | Husqvarna Garden

1 Answer

I have a Echo PB/251 Gas Blower which I recently starting having problems keeping it to run. I have to keep the choke on to let it stay at a fast idle. I have taken the carb apert along with all gas and...

Check the muffler and/or spark arrestor screen in the muffler outlet pipe and also the engine's exhaust port behind the muffler. These are prone to carbon-clogging and the engine cannot "BREATHE" enough to reach full throttle. If all-clear in the muffler, go back in the carb and locate the inlet screen directly opposite of the inlet needle. Carefully pull it out with a pick and hold it up to a light source. If you cannot see thru it, replace it. This is another, (less) common area of obstruction.

Hope this helps,

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Honda EU3000is Generator is running poorly.

Can anyone help me with the eco-trottle switch when I switch it on it seems to run the same idle whether I have it off or on, what could be causing it not to work, is it a bad switch or I am running 89 octane could that be the problem.


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My leaf blower will not start, It keeps flooding

To start: turn the choke off, hold the throttle wide open and crank. You have a carb problem but this should get you going. John

Please rate if this helps-

Mar 20, 2009 | Garden

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