[5] CHECKING/CLEANING ENGINE SPARK PLUG
CAUTION Make sure that the specified plug is used. Those other than specified may cause deficiency in or shorten the useful life of engine. • Specified spark plug: NGK BPR6HS • Box wrench and handle for spark plug removal • Plug cleaner or wire brush for cleaning 1. See “Operation 1.6 Machinery Cover” to remove the machinery cover. 2. Remove the spark plug wiring socket (1) (1 peace). 3. With the handle threaded through the hole in spark plug box wrench, remove the spark plug. 4. Remove carbon off the spark plug by means of the plug cleaner or the wire brush.
NOTES Do not use a file or the like for this purpose as it wears electrode.
5. Measure the gap of the spark plug. Standard value of the gap: 0.6 to 0.7mm 6. If the gap is off the standard, change the bending of negative side to place the gap in the standard range. 7. Install the spark plug to the original position and connect the spark plug wiring socket (1). 8. See “Operation 1.6 Machinery Cover” to install the machinery cover.
4-29
