Spark Plugs

Plug brands and gaps for the K4J, K4M, F4R and K9K engines.

Engine Plug Gap, mm
K4J EYQUEM RFN58LZ
CHAMPION RYCLC87
0.95 ± 0.05
K4M EYQUEM RFN58LZ
CHAMPION RYCLC87
0.95 ± 0.05
F4R CHAMPION RC87YCL 0.9 ± 0.05
NGK PFR6G-9 0.85 ± 0.05
K9K DENSO DG-005
FEBI BILSTEIN 17979
BOSCH 0 250 202 022
NGK Y732U
K4J, K4M, F4R are petrol engines and use spark plugs.
The F4R allows two different plug brands with different gaps.
K9K is a diesel engine and uses glow plugs - they have no electrode gap, hence the dash in the table.
See also