4-13
E
EJU20611
Cleaning and adjusting the
spark plugs
The spark plug is an important engine
component and is easy to inspect. The con-
dition of the spark plug can indicate some-
thing about the condition of the engine. For
example, if the center electrode porcelain is
very white, this could indicate an intake air
leak or carburetion problem in that cylinder.
Do not attempt to diagnose any problems
yourself. Have a Yamaha dealer service the
watercraft.
Remove and inspect the spark plug peri-
odically; heat and deposits will cause the
spark plug to slowly break down and erode.
If electrode erosion becomes excessive, or if
carbon and other deposits are excessive,
replace the spark plug with the specified
plug.
Measure the spark plug gap
a
with a
wire thickness gauge. Replace the spark
plug or adjust the gap to specification if nec-
essary.
To install the spark plug:
1. Clean the gasket surface.
2. Wipe any dirt from the threads of the
spark plug.
3. Install the spark plug, and then tighten it
to the specified torque.
4. Install the spark plug cap.
Standard spark plug: B7HS
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
Spark plug tightening torque:
25 N·m (2.5 kgf·m, 18 ft·lb)
UF1N13.book Page 13 Monday, May 31, 2004 9:02 AM
Summary of Contents for 2005 SuperJet 700
Page 1: ...2005 SuperJet 700 OWNER S OPERATOR S MANUAL ...
Page 2: ......
Page 4: ......
Page 6: ......
Page 10: ...1 3 E EJU00998 Important labels EJU01351 Label location ...
Page 11: ...1 4 E EJU01352 Warning labels 1 2 3 ...
Page 12: ...1 5 E 5 6 7 4 ...
Page 13: ...1 6 E EJU01354 Other labels 0 8 9 A B ...
Page 38: ...E MEMO ...
Page 74: ...E MEMO ...
Page 107: ...E 6 EJU01124 APPENDIX Limited warranty 6 1 YAMAHA EXTENDED SERVICE Y E S 6 3 Index 6 4 ...
Page 113: ......
Page 114: ......