Yamaha YS1070T Owner's Manual page 56

Periodic maintenance
2
2
1
5-9
3. Pull the lower part of the left side cover toward you,
and then detach the upper projections from the
rubber grommets of the body by pulling down the
left side cover.
1
1. Left side cover
2. Projection
1
4.
Remove the spark plug cap.
1. Spark plug cap
2. Spark plug
5. Remove the spark plug using a plug wrench.
6. Check the spark plug for any signs of burns.
Burn marks on spark plugs are usually medium-to-
light tan. If there are any black or white burn
marks, consult a Yamaha dealer.
7.
Remove deposits (carbon) from the spark plug
electrode using a plug cleaner or a wire brush.
8. Check the spark plug gap.
1. Spark plug gap
2. Spark plug number
3. Insulator