2009 Yamaha Motorsports Road Star S Owners Manual - Page 55

2009 Yamaha Motorsports Road Star S Manual

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PERIODIC MAINTENANCE AND ADJUSTMENT EAU19544 Checking the spark plugs The spark plugs are important engine components, which are easy to check. Since heat and deposits will cause any spark plug to slowly erode, the spark plugs should be removed and checked in accordance with the periodic maintenance and lubrication chart. In addition, the condition of the spark plugs can reveal the condition of the engine. To remove a spark plug 1. Remove the spark plug cap. 1 2. Install panel A. 1. Spark plug wrench 1 To check the spark plugs 1. Check that the porcelain insulator around the center electrode on each spark plug is a medium-tolight tan (the ideal color when the vehicle is ridden normally). 2. Check that all spark plugs installed in the engine have the same color. TIP If any spark plug shows a distinctly different color, the engine could be operating improperly. Do not attempt to diagnose such problems yourself. Instead, have a Yamaha dealer check the vehicle. 7 1. Spark plug cap 2. Remove the spark plug as shown, with the spark plug wrench included in the owner's tool kit. 7-9

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PERIODIC MAINTENANCE AND ADJUSTMENT
7-9
7
2.
Install panel A.
EAU19544
Checking the spark plugs
The spark plugs are important engine
components, which are easy to check.
Since heat and deposits will cause any
spark plug to slowly erode, the spark
plugs should be removed and checked
in accordance with the periodic mainte-
nance and lubrication chart. In addition,
the condition of the spark plugs can re-
veal the condition of the engine.
To remove a spark plug
1.
Remove the spark plug cap.
2.
Remove the spark plug as shown,
with the spark plug wrench includ-
ed in the owner’s tool kit.
To check the spark plugs
1.
Check that the porcelain insulator
around the center electrode on
each spark plug is a medium-to-
light tan (the ideal color when the
vehicle is ridden normally).
2.
Check that all spark plugs installed
in the engine have the same color.
TIP
If any spark plug shows a distinctly dif-
ferent color, the engine could be oper-
ating improperly. Do not attempt to
diagnose such problems yourself. In-
stead, have a Yamaha dealer check
the vehicle.
1.
Spark plug cap
1
1.
Spark plug wrench
1