1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 346Get this manual
TILLER HANDLE
2Install throttle linkage on pulley and throttle barrel56974
aThrottle LinkageThrottle BarrelPulley
3Check to make sure throttle linkage has free movement between throttle barrel and pulley
NOTE: The throttle arm should remain stationary while checking for free movement of throttle linkage