1-22
PRIMARY CHAIN
INSPECTION
Check primary chain:
● At the 500 mile (800 km) service interval.
● At every 5000 mile (8000 km) service interval thereafter.
Check primary chain for correct tension by measuring its ver-
tical freeplay through the primary chain inspection cover
opening located near the top of the primary cover.
1. See Figure 1-24. Remove two screws from primary chain
inspection cover.
2. Remove primary chain inspection cover.
3. See Figure 1-25. Check primary chain tension by mea-
suring vertical freeplay (measuring midway between
sprockets) several times, each time with primary chain
moved (by rotating engine) to a different position on
sprockets.
4. Check primary chain tension against Table 1-7. If neces-
sary, adjust as described below.
NOTE
●
Measurements are taken with sprockets rotated to tight-
est chain position.
●
The initial primary chain vertical freeplay specification
used at the assembly plant is 1/4-1/2 in. (6.3-12.7 mm)
with a cold engine. The 1/4 in. (6.3 mm) minimum is only
allowed at the absolute tightest point in the drive, as
measured with specialized factory equipment. If a chain
has less than 1/4 in. vertical freeplay (with a cold
engine), adjust freeplay to the “field” specification of 3/8-
1/2 in. (9.5-12.7 mm).The looser specification will avoid
overtightening, which might otherwise occur during
adjustment using “non-factory” equipment and methods.
5. Install primary chain inspection cover. Tighten screws to
40-60 in-lbs (4.5-6.8 Nm).
ADJUSTMENT
NOTE
If vertical freeplay cannot be set within the limits specified,
then primary chain and/or chain adjuster are worn beyond
adjustment limits. Replace parts as necessary. See Section 6.
1. See Figure 1-26. Loosen locknut and turn adjusting
screw:
a. Turn clockwise (inward) to reduce freeplay.
b. Turn counterclockwise (outward) to increase free-
play.
2. Tighten locknut to 20-25 ft-lbs (27.1-33.9 Nm).
Table 1-7. Primary Chain Tension
ENGINE TEMPERATURE FREEPLAY
Cold 3/8-1/2 in.
(9.5-12.7 mm)
Hot (normal running temperature) 1/4-3/8 in.
(6.4-9.5 mm)
Figure 1-24. Primary Chain Inspection Cover
Figure 1-25. Measuring Primary Chain Tension
Figure 1-26. Primary Chain Adjustment
Primary chain
inspection cover
5583
Screws
b0085x6x
Front sprocket
Rear sprocket
Adjusting screw
5592
Locknut
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