Question about Stihl BR400 Backpack Leaf Blower

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Stihl br 400 problem- spewing oil out the back of motor

16 year old blower, many hours on it, seems to still have lots of power, runs good spewing oil out the rear plastic housing, top of gas tank area making for a nasty mess. Could it the cylinder rings are worn out?

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  • Howard Dahl Jan 13, 2013

    Is this the result of a worn out stihl blower having worn piston rings to cause the heavy oil residue coming out the back onto the plastic housing and running down onto fuel tank and under frame housing. I wipe it down between gas tank fuel ups, and continues to happen .

  • Howard Dahl Jan 13, 2013

    Is this the result of a worn out stihl blower having worn pistons rings to cause the heavy oil residue coming out the back onto the plastic housing and running down onto the fuel tank and under frame housing? I wipe it off between gas tank fuel ups, and itcontinues to happen.

  • rmzinck Oct 03, 2013

    There are two reasons why this happens. You are most likely mixing your oil/gas to rich with oil. You have slowly filled the crack case with oil. You might also be using the wrong two stroke oil. Marine two stroke is made for water cooled engines and does not work well with air cooled engines. Husqvarna makes the best two stroke oil and it also has a stablizer in it.

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I would say it is not an issue with the piston and rings, any oil leaking from the muffler has to be unburnt oil from the fuel/oil mix, if not already you should run it at a 50-1 mix, also make sure the engine is not running too rich on the fuel screws, check the condition of the air filter as a blocked filter will richen the mixture.

Posted on Jan 15, 2013

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