Husqvarna spark plug chart. Want a spark plug chart for Husqvarna that agrees with the service manual? Start with the NGK BPMR7A, gapped to 0.020 inches or 0.5 mm. It fits most current 2-stroke saws, trimmers, and blowers. Pick it up as Husqvarna part 503 23 51-11 or the branded HQT-1R, 577 48 40-01. Champion RCJ7Y is the direct equivalent. Older M10-thread handhelds, the 125L trimmer family, and anything with a four-stroke mower engine use something different. That is where the wrong plug gets installed. The tables sort it out model by model. One number to watch. The NGK BPMR7A ships gapped at 0.028 inch, but Husqvarna’s own service data says 0.020 inch or 0.5 mm for most 2-stroke saws this plug covers. Verify against your model’s manual before you install, every time. The heat-range digit after BPM is the key identifier. A plug with a different number is a different thermal part. Heat-range selection should be left to the Husqvarna service manual rather than adjusted by the owner. One family to keep straight. The 122LD, 122C, and 122LK all use an M10 x 1 plug. No swapping with the M14 BPMR7A.