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Appendix 1
–
Spark Plugs & Adapters
Short Reach Plugs
(uses SR plug adapter)
1) NGK Spark Plug BR8ES 2.5mm center electrode. Stock #3961 has a solid terminal tip
(preferred). Stock #5422 has a screw on tip
– if used make sure the tip is well secured.
2) NGK Spark Plug BR8EIX iridium electrode with solid tip.
Long Reach Plugs
(uses LR or LRX adapters)
1) Denso Spark Plug IKH27 (stock #5347) has an iridium electrode with a solid terminal tip.
IMPORTANT:
Remember to
FIRST
install spark plug in the adapter (fully seated and finger tight).
THEN,
insert the combined plug/adapter assembly in the engine and tighten to
18 ft/lb
(standard
auto plug torque) through the spark plug ONLY.
Do NOT torque the adapter itself.
If you torque
the adapters directly, stress will be focused underneath the adapter head and it can fail during
installation. Such failures are not covered under warranty. Use anti-seize (sparingly) on the
outer/engine side of adapters.
Operators need to monitor spark plug condition and adjust the plug temperature range if needed.
The temperature rating
is indicated by the NGK “8” or the Denso “27” reference in the
plug number. If selecting a different range, remember that lower numbers indicate a
hotter temperature rating, and higher numbers indicate a cooler rating.