Question about Stihl 012 Av 012av Chainsaw With 14 Inch Bar & Chain 3/8", 91 Series

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Adjustments carb zama

Carburettor settings for the H and L screws and the LA screw

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Hello,
Check this site: http://tekindoor.com/miscellaneous/stihl-chainsaw-carburetor-adjustment/

Theher is good information.

Posted on Apr 03, 2014

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1 Answer

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start with your screws turned in. adjust the high screw to 1 turn and the low to 1/2 turn. this should get unit running. once running then you can fine tune the carb

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http://www.zamacarb.com/tipspage.html

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RE: MTD trimmer YM1500, 31 cc motor. Won't run without the check lever near full on. Fresh gas, mixed 1 gal to 3.2 oz 2-cycle oil. Found & tightened loosescrew on throttle butterfly valve, and loose...


Most carbs have a H (running) and L (idle) mixture screws on them, but the newer ones are getting away from that somehwhat and some aren't adjustable. I am including a tech guide for carb adjustment for a Zama carb. All diaghram carbs are similar.
http://www.zamacarb.com/tipspage.html

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1 Answer

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Hey June, the correct assembly. cleaning. setting, and adjustments of the carburetor are CRITICAL....Please take the carb to a qualified professional to get it cleaned and set. Ask him which screw sets the idle speed..and you can set it when you reassemble it.. (ONLY adjust the idle speed screw!!)
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