Spark Plugs
Chapter 2 Spark Plugs
24
For motorcycle
16
16
X24GPR-U
X24EPR-U9
W27EMR-C
U27FER9
U31ETR
U27ESR-N
U20FSR-U
Y27FER
●
There are various types for different manufacturers
and models.
●
Because spark plugs must be used in specific
engines, it is difficult to make a general (common)
spark plug.
Example : X24GPR-U
●
There is a 3 mm shroud at the thread tip and the
thread length is 22 mm, so this spark plug can only be
used in the specified vehicles.
●
Only for Honda.
Example : X24EPR-U9
●
φ
12 mm
×
L 19 mm
Example : W27EMR-C
●
Spark plug with compact insulator head section.
●
Only for Suzuki and Honda.
Example : U27FER9
●
φ
10 mm
×
L 19 mm half threads.
●
Ignition is improved by widening the gap from 0.6-0.7
mm for previous models to 0.9 mm.
●
Only for Honda.
Example : U31ETR
●
The heat-proofing is improved by having two ground
electrodes.
●
For Kawasaki and Suzuki.
Example : U27ESR-N
●
φ
10 mm
×
L 19 mm all threads.
●
The fouling-proofing is improved with the 0.5-mm
projection.
●
For Kawasaki, Suzuki, and Yamaha.
Example : U20FSR-U
●
φ
10 mm
×
L 12.7 mm
Example : Y27FER
●
Ultra-compact spark plugs
φ
8 mm x L 19 mm half
threads.
●
Can only be installed in the specified vehicles.
●
Only for Honda.
3mm
19mm
12.7mm
6.3mm
12.7mm
6.3mm
