.25
it uses a RDJ7Y
The spark plug gap for a Bolens tiller BL410 with a 31cc Champion DJ7Y plug is typically set at 0.025 inches (0.635 mm). It's important to check the owner's manual or manufacturer's specifications for the most accurate information, as gaps can vary slightly based on the specific engine model. Always ensure the gap is properly adjusted for optimal engine performance.
I have a Bolens Model BL 150, 31cc and my Operator's Manual calls for a spark plug gap of 0.020 in. (0.5 mm).
Two cycle (two Stroke) engines generally have one spark plug per cylinder. So a four cylinder, 2 cycle engine will have 4 spark plugs.
The spark will depend upon the type of engine being used, either 2 cycle or 4 cycle. If it is a 4 cycle, chances are the engine was produced by either Tecumseh or Briggs.
For a 12.5 hp Tecumseh 4-cycle engine, the recommended spark plug is typically the Tecumseh part number 6400A or equivalent, such as the Champion H10 or H12. Always check the owner's manual or the engine's specifications for the exact spark plug type, as variations may exist based on the engine model. Properly gap the spark plug according to manufacturer specifications to ensure optimal performance.
compression and ignition
On the inline six cylinder engine , spark plug # 6 is the rear spark plug On the V6 engine , spark plug # 6 is the rear plug on the drivers side of the engine On the V8 engines , spark plug # 6 is the 2nd plug from the front on the drivers side of the engine
The correct spark plug for a 5 hp. Tecumsen 4-cycle motor is Champion J-8 (RJ17LM). The plug gap is 0.030 in. (0.76 mm)
A typical lawnmower has a one-cylinder engine, with one spark plug.
The spark plug initiates the combustion reaction during the power stroke of the four-stroke engine cycle. This occurs after the compression stroke, where the air-fuel mixture is compressed, and the spark plug ignites it, causing an explosion that drives the piston down. This process converts the chemical energy of the fuel into mechanical energy.
Most commonly a 13/16", but a 3/4" is possible.