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When selecting a spark plug for your Kohler small engine from another manufacture (NGK, Bosch, Autolite, AC) then listed here, it is best to use their reference catalog to see what spark plug they recommend for your Kohler engine. And if their catalog is not showing the engine you have use their cross reference chart from one of the plugs listed below. Some plug listed are resistor type plugs and are usually identified by the (R) in the plug part number. Resistor type plugs suppresses the RFI (radio frequency interference) in your engine, with out resistor plugs you can experience static on your radio as well as interfere with other sensitive electronic equipment. Some engines must use resistor plugs for a proper talkback to the electronic ignition.
MODEL
HP
DENSO PLUG
CHAMPION PLUG# KOHLER#
PLUG GAP
4 hp
W14EXR-U
RN14YC 6613201
.030
6 hp
8.5 hp
10 hp
12 hp
7 hp
Q16PR-U11
RC12YC (XC12YC) 1213202 (2413214)
5 hp
RC12YC 1213202
.040
9.5 hp
11 hp
12.5 hp
13 hp
14 hp
RC12YC (XC12YC) 1213202 (2513214)
15 hp
16 hp
17 hp
18 hp
Q16PR-U or K16PR-U
Q16PR-ZU
RC12YC 1213202 3071 2513212 Pro Series
20 hp
22 hp
K16PR-U
RC12YC 12132023071 2513212 Pro Series
23 hp
25 hp
26 hp
27 hp
3071 2513212 Pro Series
28 hp
30 hp
3071 2513212
34 hp
XC10YC 6213204
36 hp
38 hp
40 hp
W14LM-U
RJ8C 4113206
.025
W14-U
6.25 hp
8 hp
K241 Magneto K241 Battery Ignition K241 Breakerless
W14L
RH10C 2513210
.025 .035 .035
.035
24 hp
T14PR-U
RV17YC 5213202
19 hp
21 hp
RC14YC 6613201
31 hp
W20SR-U
RCJ8 4113202
W16LS
T16PR-U
6.5 hp
3.5 hp
RA10HC RFI 8815 1413206
4.5 hp
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