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The Craftsman 4.5hp mower uses either a Champion model RJ19LM or J19LM spark plug, or equivalent, with the gap set at . 030 inch.
The gap setting is different for each vehicle but most are somewhere between 0.028″ and . 060″. Consult the owner`s manual or Champion ® catalog to find the recommended setting for the vehicle you`re working on.
Check the gap with a spark plug gauge. It should be 0.03 inches (0.76 millimeters).
A) For 28-32 cc engines, set the gap at 0.020″ (0.5 mm). B) For 38-55 cc engines, set the gap at 0.025″ (0.635 mm). IMPORTANT!: Always refer to the appropriate product Operator`s Manual for exact specifications and additional model specific service information when replacing spark plugs.
The incorrect plug gap for your engine can contribute to a high rate of misfires, loss of power, plug fouling, poor fuel economy and accelerated plug wear. It is always best to check the gap against the manufacturer`s specifications.
Today`s spark plugs come pre-gapped, but it`s a good idea to double check this before installation. Use a gap tool and make sure the gap matches the specs for your machine.
The larger the gap, the more voltage is needed to jump the gap. Most experienced tuners know that increasing the gap size increases the spark area exposed to the air-fuel mixture, which maximizes burn efficiency.
A smaller gap will yield a short, intense spark and will usually make the engine real responsive. A wide gap creates a longer spark arc but without sufficient “juice” from your ignition system, (including amps), it can be weak and yellow in color.
The gap adjustment can be fairly critical, and if it is maladjusted the engine may run badly, or not at all. A narrow gap may give too small and weak a spark to effectively ignite the fuel-air mixture, while a gap that is too wide might prevent a spark from firing at all.
The spark plug gap should be set to between 0.028 and 0.030 inches (0.70 to 0.80 mm.)
Spark Plug Gap: 0.0275 – 0.0314” (0.7-0.8 mm) 5.
Discover Relevant Questions and Answers for Your Specific Issue
the most relevant questions and answers related to your specific issue
What should the spark plug gap be on a weedeater trimmer 25cc
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The recommended setting is .030″
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20-25 thou which is around 0.6mm
I need the spark plug gap for a MTD mower model # 11A038A729. It has a Briggs 12M902 0451 E1. Thanks.
The proper gap is ..030″ Here is the Briggs application chart for L-Head engines like yours.
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Hi, your spark plug gap should be the thickness of a hacksaw blade. use a hacksaw blade. sheers
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