2011 Yamaha Motorsports Apex Owners Manual - Page 57

2011 Yamaha Motorsports Apex Manual

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Periodic maintenance and adjustment 1 3. 4. Tighten the quick fastener screws. Pass the brake hose, throttle cable, parking brake cable and wire harness through the cable guide, place the cable guide in the original position, and then install the screws. 2 1 1. Top cover 2. Main switch coupler 1 2 1. Cable guide 5. Install the left side cover and the shroud. ECS00372 NOTICE G 1. Top cover 2. Auxiliary DC jack coupler G To install the top cover 1. Connect the main switch coupler and auxiliary DC jack coupler. 2. Place the top cover in the original position, making sure to fit the projections on the cover into the slots in the headlight unit. Make sure that all cables, hoses and leads are routed properly before installing the shroud and covers. When installing the shroud and covers, be sure to tighten the fasteners securely. ESU11784 Checking the spark plugs The spark plugs are important engine components and are easy to inspect. The condition of the spark plugs 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-tolight tan color for a snowmobile that is being ridden normally. If any 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 at- 1 1. Top cover 51

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Periodic maintenance and adjustment
51
To install the top cover
1.
Connect the main switch coupler and
auxiliary DC jack coupler.
2.
Place the top cover in the original posi-
tion, making sure to fit the projections on
the cover into the slots in the headlight
unit.
3.
Tighten the quick fastener screws.
4.
Pass the brake hose, throttle cable, park-
ing brake cable and wire harness through
the cable guide, place the cable guide in
the original position, and then install the
screws.
5.
Install the left side cover and 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.
ESU11784
Checking the spark plugs
The spark plugs are important engine compo-
nents and are easy to inspect. The condition
of the spark plugs 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-
light tan color for a snowmobile that is being
ridden normally. If any spark plug shows a
distinctly 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-
1.
Top cover
2.
Main switch coupler
1.
Top cover
2.
Auxiliary DC jack coupler
1.
Top cover
1
2
2
1
1
1.
Cable guide
1