2010 Yamaha Motorsports FX Nytro MTX Owners Manual - Page 53

2010 Yamaha Motorsports FX Nytro MTX Manual

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Periodic maintenance and adjustment Left and right side covers To remove a side cover 1. Remove the shroud. (See above for removal procedures.) 2. Loosen the fasteners, and then remove the side cover as shown. G When installing the shroud and covers, be sure to tighten the fasteners securely. ESU11782 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: Manufacturer: NGK Model: CR9E EWS00710 1 2 2 2 1. Left side cover 2. Fastener To install a side cover 1. Insert the projection on the rear of the side cover into the slot in the fuel tank side cover and insert the projections on the front of the side cover into the slots in the lower cover. 1 1. Left side cover WARNING Be sure to use the specified spark plug and spark plug cap. Otherwise, the T.O.R.S. may not work properly. Spark plugs are produced in several different thread lengths. The thread length or reach is the distance from the spark plug gasket seat to the end of the threaded portion. If the reach 2. 3. Tighten the fasteners. Install the shroud. ECS00372 NOTICE G Make sure that all cables, hoses and leads are routed properly before installing the shroud and covers. 47

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Periodic maintenance and adjustment
47
Left and right side covers
To remove a side cover
1.
Remove the shroud. (See above for re-
moval procedures.)
2.
Loosen the fasteners, and then remove
the side cover as shown.
To install a side cover
1.
Insert the projection on the rear of the
side cover into the slot in the fuel tank
side cover and insert the projections on
the front of the side cover into the slots in
the lower cover.
2.
Tighten the fasteners.
3.
Install the shroud.
NOTICE
ECS00372
●
Make sure that all cables, hoses and
leads are routed properly before install-
ing the shroud and covers.
●
When installing the shroud and covers,
be sure to tighten the fasteners secure-
ly.
ESU11782
Checking the spark plugs
The spark plug is an important engine compo-
nent 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 dis-
tinctly different color, there could be some-
thing wrong with the engine. For example, a
very white center electrode porcelain color
could indicate an intake track air leak or car-
buretion problem for that cylinder. Do not at-
tempt 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.
WARNING
EWS00710
Be sure to use the specified spark plug
and spark plug cap. Otherwise, the
T.O.R.S. may not work properly.
Spark plugs are produced in several different
thread lengths. The thread length or reach is
the distance from the spark plug gasket seat
to the end of the threaded portion. If the reach
1.
Left side cover
2. Fastener
1.
Left side cover
2
1
2
2
1
Specified spark plug:
Manufacturer:
NGK
Model:
CR9E