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Cylinder Heads, Spark Plugs

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All tractors that we are dealing with have aluminum heads - be very careful not to over tighten the spark plug - 1/4 to 1/2 turn after bottoms out to make it snug should do. It is also not a good idea to install or remove a plug on a hot engine - slightly warm - still be careful! Heli-coils are available but are not the greatest fix. Older B&S originally came with Champion J-8 spark plug. Current plug is J19LM and can help oil fouling in some cases. Torque patterns for heads are provided by engine MFG but another simple way on 9-bolt heads is to tighten every 4th bolt until you come around to the first again. Start with 1/3 of your torque spec, increase to 2/3 the 2nd time around and use the final torque on the 3rd time around.

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