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My stihl BR420c blower loses power after running.

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Try turning the high speed mixture screw out a quarter turn.

Posted on Mar 22, 2011

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STIHL BLOWERS BG 56/C and BG 86/C


I don't have much experience with Stihl products but I do have a couple of disc cutters, both of which had a short life and suffered piston damage.

I suspect the air cleaner isn't as efficient as it should be.

Apr 26, 2017 | Stihl Garden

1 Answer

My br420c blower runs fine for about 20 seconds and then shuts off like the switch has been turned off


possibility 1) It sounds like it is sucking air with the gasoline. 2) don't rush the choke, leave it running on high with 1/2 choke. When you go to move the choke to off, move it very very slowly while the governor can catch up and raise the revs. Or slow the revs down before turning the choke off.

Oct 23, 2013 | Stihl Br420c Magnum

1 Answer

Stihl blower want run without the choke on and then not full power


Secondary air seepage through leaking gasket on carb spacer flange, poorly mounted or faulty manifold.
Piston rings leaking or broken.
Muffler carbonised

Aug 03, 2013 | Stihl Garden

1 Answer

Out of time what do you do


Check the ignition module, timing gap and keyway on the flywheel. All 3 can effect the timing of the machine

Feb 26, 2013 | Stihl Br420c Magnum Leaf Blowers

1 Answer

Replaceing keyway


If the timing is out and the keyway on the flywheel is damaged then you must replace the flywheel. There are ways to 'bodge' the flywheel but its not worth potentially damaging the machine.
Flywheel part number is: 4203 400 1200

Feb 26, 2013 | Stihl Br420c Magnum Leaf Blowers

1 Answer

I have a stihl pole saw ht101. The saw starts fine and runs for a minute or two, then loses power. What ido I check?


If you mean the engine is losing power your more than likely have a restriction in the exhaust. The sut from the two stroke mix builds up and restricts the exhaust gases. Hence looses power. Happened to me lots of times

Aug 02, 2012 | Garden

1 Answer

Stihl Leaf Blower BG86c no top speed


take off the muffler and run it the screen inside it might be plugged and you can clean it off by opening the muffler

Jun 09, 2012 | Stihl Bg 86c Handheld Blower Cylinder...

2 Answers

Stihl bg 55 blower runs good for 5 min. then loses power


1) carburetor gaskets/diaphragms may need to be replaced

2) ignition coil may be breaking down when hot

3) check compression when cold, then after it stops, when hot

4) could have a vacuum/pressure leak

*I would investigate carb first

Nov 08, 2009 | Garden

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