2006 Yamaha Motorsports Apex GT Owners Manual - Page 65

2006 Yamaha Motorsports Apex GT Manual

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WARNING @ G G G @ Do not drive the snowmobile with the shroud or covers unfastened or removed. Keep your body and clothing away from rotating parts when servicing the snowmobile with the shroud or covers removed. Do not touch the hot muffler and engine during or immediately after operation. CAUTION: @ Make sure that all cables, leads, etc., are in place when installing the shroud and covers. @ NOTE: @ When installing the shroud and covers, be sure to turn the fasteners and top cover bolts completely until they stop; about 1/4 turn after they are seated. @ ESU03681 Checking the spark plugs The spark plug is an important engine component and is easy to inspect. The condition of the spark plug can indicate the condition of the engine. Check the coloration on the white porcelain insulator around the center electrode. The ideal coloration at this point is a medium to a light tan color for a snowmobile that is being ridden normally. If a spark plug shows a distinctly different color, there could be something wrong with the engine. For example, a very white center electrode porcelain color could indicate an intake track air leak or carburetion problem for that cylinder. Do not attempt to diagnose such problems yourself. Instead, take the snowmobile to a Yamaha dealer for inspection and possible repairs. You should periodically remove and inspect the spark plug because heat and deposits will cause a spark plug to slowly break down and erode. Consult a Yamaha dealer before changing to a different type of spark plug. Specified spark plug: R CR9EB (NGK) 8-7

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8-7
WARNING
@
●
Do not drive the snowmobile with the shroud or
covers unfastened or removed.
●
Keep your body and clothing away from rotating
parts when servicing the snowmobile with the
shroud or covers removed.
●
Do not touch the hot muffler and engine during or
immediately after operation.
@
CAUTION
:
@
Make sure that all cables, leads, etc., are in place
when installing the shroud and covers.
@
NOTE:
@
When installing the shroud and covers, be sure to turn
the fasteners and top cover bolts completely until they
stop; about 1/4 turn after they are seated.
@
ESU03681
Checking the spark plugs
The spark plug is an important engine component and is
easy to inspect. The condition of the spark plug can indi-
cate the condition of the engine. Check the coloration on
the white porcelain insulator around the center electrode.
The ideal coloration at this point is a medium to a light
tan color for a snowmobile that is being ridden normally.
If a spark plug shows a distinctly different color, there
could be something wrong with the engine. For example,
a very white center electrode porcelain color could indi-
cate an intake track air leak or carburetion problem for
that cylinder. Do not attempt to diagnose such problems
yourself. Instead, take the snowmobile to a Yamaha
dealer for inspection and possible repairs. You should
periodically remove and inspect the spark plug because
heat and deposits will cause a spark plug to slowly break
down and erode. Consult a Yamaha dealer before chang-
ing to a different type of spark plug.
Specified spark plug:
R CR9EB (NGK)