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Have a stihl hedgetrimmer, will run fine for a while, then stalls. Will only restart and run with high revs

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Certain models of Stihl equipment have a vented fuel tanks, ive recently had 2 in for repair with similar symptoms, but also showed signs of fuel soaked air filter. The fuel tank vents have a delicate little valve in them which have a tendency to perish/break causing fuel to flow back up the breather pipe.

They were stored hanging on a rack with the engines down, which i done suppose helps. I'd advise to stoe flat or if hanging,'engine's up'.

Posted on Mar 04, 2013


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Posted on Jan 02, 2017

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SOURCE: hedgetrimmer is not starting easily and when

  • might pay to check sounds like the unit has a air leak

either at carb gasket , manifold block or intake boot or impulse hose or base gasket or crankcase seals particularly if carby is good and compression and spark are good and muffler is clear and fuel lines and breather and fuel filter are all ok

symptoms of air leak are - hard to start, inconsistant idle
ineffective carb adjustments - stalling , no power , rough running- over revving

this might pay to have done at local service shop unless you have poper tools to block off ports and pressure and vacuum test unit ?

cheers paul46 hope it helps

Posted on Sep 12, 2010

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