Polaris 1999 ATV Sport 400 - Manual (Page 6)

6
The following Oil Pump Adjustment Procedure, taken from page 106 of your ATV Owner’s Manual, has been revised.
MAINTENANCE
Oil Pump Adjustment Procedure
400 Engines
1. Before adjusting the oil pump, check engine idle RPM and carburetor adjust-
ments which are found in the owner’s manual supplement.
2. Loosen throttle cable jam nut and turn adjuster in or out until there is 1/16²
- 1/8² (.16 - .32 cm) of throttle lever travel before throttle slide starts to open.
See Owner’s Manual Supplement.
3. Place very slight pressure on the throttle lever until all freeplay is removed
from throttle cable (to the point where the carb slide is just starting to rise).
4. Lift boot up off adjuster sleeve. Remove the oil pump cover. Loosen the cable
adjuster locknut. Adjust oil pump cable until marks align (D) when the throttle
slide just begins to raise.
5. Tighten the locknut.
6. Recheck adjustment. If correct, slide boot all the way down over the upper portion of the bottom nut to ensure
good sealing against water entry. Reinstall oil pump cover and gasket.
PN 9914952 Rev 02 1/99
Printed in U.S.A.
Oil Pump Adjustment 400
D
Boot
Adjuster
Sleeve
Upper Portion
of Bottom Nut