1985-1986 Honda ATC250R Shop Manual, Page 22Get this manual
MAINTENANCE
SPARK PLUG
Disconnect the spark plug cap and remove the spark plug using the wrench provided in the tool kitVisually inspect the spark plug electrodes for wearThe center electrode should have square edges and the side electrode should have constant thicknessDiscard the spark plug if there is apparent wear or if the insulator is cracked or chippedMeasure the gap with wire-type feeler gauge and adjust by carefully bending the side electrodeSPARK PLUG GAP: 0.7-0.8 mm (0.028-0.031 in) RECOMMENDED SPARK PLUG:
SPARK PLUG WRENCH
COLD WEATHER BR8ES (NGK)
BP9ES (NGK) RN2C (CHAMPION)
- RN3C (CHAMPION)
0.7-0.8 mm (0.028-0.031