What spark plug does a Craftsman lawn mower use?
The Craftsman 4.5hp mower uses either a Champion model RJ19LM or J19LM spark plug, or equivalent, with the gap set at .
Also know, what size thread is a lawn mower spark plug?
The thread sizes of lawn mower spark plugs are different from those of automobiles spark plugs. Ideally, most automobile spark plugs use a thread size of about 14mm thread why those of lawn mower range between 10 to 12 mm.
In respect to this, which spark plug wire goes to which cylinder?
Cylinders 1 and 2 are always closest to the engine. On most four-cylinder engines -- no matter the make -- the firing order is 1-3-4-2 and the cylinders are numbered 1-2-3-4, with No. 1 being the closest to the front of the engine.
Do lawn mower spark plugs come pre gapped?
Check the gap on the new spark plug before installing it. A new plug will often come pre-gapped to match your specific engine, but use a spark plug gauge to verify that it matches the manufacturer's specifications.Spark plugs that are gapped incorrectly can cause an engine to miss, or run erratically, especially during idle. The incorrect spark plug gaps can cause uneven firing of individual spark plugs and delay engine combustion; both of which can cause an engine to miss or idle erratically.Flathead Engine Spark Plugs & Gaps
|Replacement Part Type||Briggs & Stratton Spark Plug Part Number||Spark Plug Gap|
|Extended Life Series® OHV Spark Plug Platinum (Replaces Champion RC12YC)||696202 5066 (5066D, 5066H)||.030”|
|Resistor Spark plug - hotter spark (Replaces Champion RC14YC)||496018S 5092||.030”|
|Fits||BRIGGS & STRATTON GAS ENGINES -- All models except twin cylinder, Vanguard Intek, 19A400-19G400 series|
|Center Electrode||Copper Core|
|Hex Size||5/8" (16mm)|