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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... bruce903@charter.net.

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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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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 :-)

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Please rate if this helps-

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