According to Craftsman owner manual for 4.75 horsepower mower model 917.388920 spark plug RJ19LM the gap is .030.
Also: Oil type (API SG-SL) SAE 30 (above 32 F) and SAE SW-30 (below) 32 deq. F
Blade bolt torque 35-40 lbs.
0.030-0.035
0.028-0.030"
The spark plug gap for a Murray 12 hp riding lawn mower should be set at .020 inches. This is equal to .5 mm.
what spark plug do i need for a 3.75
need the engine model, type and code
No, not all lawn mower spark plugs are the same. Different lawn mowers may require different types or sizes of spark plugs to function properly. It is important to use the correct spark plug recommended by the manufacturer for your specific lawn mower model.
The spark plug gap for a Murray 3.5 horsepower lawn mower should be set at .030 inches. A new spark plug will come with the gap preset and should need no further adjusting.
.030
how to install a spring clutch on a murray mower
J19lm
Lawn mower spark plugs are not universal; different models require specific spark plugs designed for their engine type and size. It is important to use the correct spark plug recommended by the manufacturer for optimal performance.
where is the primer on a murray 625 ex series