Craftsman 247.77640 Operator's Manual page 18

Service Spark Plug
1. Cleanthe sparkplug and resetthe gap to .030"at leastonce a
seasonor every 50 hoursof operation.
2. Cleanthearea aroundthe sparkplug. Removeand inspectthe
spark plug.
3. Replacethe spark plug if the electrodesare pitted,burnedor the
porcelainis cracked.
NOTE:Contacta SearsPartsand RepairCenteror 1-800-4-MY-
HOME®for a replacementsparkplug,Champion®partnumber
RJ19LM.
4. Checkthe electrodegap with a wirefeelergaugeand resetthe
gap to .030inches.See Figure19.
2
\
mm
ii
114F---___ 1
3
r!
1. .030(.76 ram) Gap
2. Electrodes
3. Porcelain
Figure19
NOTE: Donot sandthe sparkplug.The spark plugshouldbe cleaned
with a wirebrushand a commercialsolvent.
Clean Engine
1. Cleantheengine periodically, b y removingdirt and debriswith a
cloth or brush.
NOTE: Cleaningwith a forcefulsprayof wateris not recommended as
watercouldcontaminate the fuel system.
2. Toensuresmoothoperationof theengine,keepthe governor
linkage,springsand controlsfreeof debris.
3. Every 100hoursof operation,removecombustiondepositsfrom
topof cylinder,head,top of pistonand aroundvalves.