Stihl BG85 - will only idle - HobbyTalk
 
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post #1 of 10 (permalink) Old 05-16-2010, 10:01 PM Thread Starter
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Stihl BG85 - will only idle

This leaf blower starts and idles fine, but sputters out as soon as I try to rev it up. I can feather it to full speed, but then it will sputter and die.

I cleaned the air filter, changed the gas (use stihl oil/mix), shot in some carb cleaner, and tried leaving the cap partially open -- same result.

Any other ideas? I have 2 carb adjustment screws that I haven't touched.
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post #2 of 10 (permalink) Old 05-16-2010, 10:23 PM
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Check the exhaust screen and make sure its not clogged. If its not clogged then your issue is in the carburetor, it more then likely needs a good cleaning and maybe a rebuild.
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post #3 of 10 (permalink) Old 05-17-2010, 12:44 AM Thread Starter
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I'll check the exhaust.

If the carb in the culprit, how hard it is to get parts and rebuild a Stihl carb? I replaced a diaphram on my lawnmower last summer which was cheap and easy.
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post #4 of 10 (permalink) Old 05-17-2010, 12:22 PM
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Before you start taking it apart try opening the H adjustment screw about 1/4 turn. Have a good one. Geo
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post #5 of 10 (permalink) Old 05-17-2010, 01:59 PM Thread Starter
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exhaust - checked and it was in good and clean condition.

H adjustment - still sputters and dies at full throttle.
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post #6 of 10 (permalink) Old 05-17-2010, 04:04 PM
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Quote:
Originally Posted by walkman View Post
exhaust - checked and it was in good and clean condition.

H adjustment - still sputters and dies at full throttle.
Here are the adjustment instructions, if they don't help then it will be necessary to remove, clean and install a carb kit. Have a good one. Geo
Attached Files
File Type: pdf HowToAdjustCarburetor.pdf (68.1 KB, 97 views)
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post #7 of 10 (permalink) Old 05-17-2010, 04:48 PM Thread Starter
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Carb adjustment doesn't accomplish anything.

Is is practical to rebuild the stihl carbs one self? I'm not finding much on-line to buy a kit -- which doesn't surprise me with Stihl.
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post #8 of 10 (permalink) Old 05-17-2010, 07:40 PM
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Carb adjustment doesn't accomplish anything.

Is is practical to rebuild the stihl carbs one self? I'm not finding much on-line to buy a kit -- which doesn't surprise me with Stihl.
Your blower will have a Zama C1Q carb, S50, S55, S64 or S68A.
Kits RB=Rebuild GND=Gasket and Diaphragm
S50 kit is RB-79 - GND-39
S55 kit is RB-89 - GND-50
S64 kit is RB-89 - GND-50
S68A kit is RB-99 - GND-56
I suggest you take the carb with you if you have a small engine shop locally and they can give you the proper parts. Have a good one. Geo
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post #9 of 10 (permalink) Old 05-17-2010, 08:40 PM
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stihl part #'s 4229 007 1060 or 1129 007 1062 depending on your carburetor it will be either one of these kits.
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post #10 of 10 (permalink) Old 07-24-2010, 01:49 PM
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Bg 85

The problem is in the carburetor. There is a glue around the welch plug that comes apart and loads up the leaf blower. You can buy one for about $30 at your local dealer.
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