TIMING, SYNCHRONIZING, & ADJUSTING
90-828631R3 MARCH 1999 Page 2C-3
Carburetor Adjustments
Idle Speed Adjustment
NOTE: The engine should be completely warmed up for the adjustment. Correct adjust-
ments can not be obtained in a cold condition.
1. With the outboard in neutral gear and in the water, start engine and allow to warm up.
2. Shift outboard into forward gear.
3. Turn the idle adjustment screw located on the #4 (bottom) carburetor to attain the speci-
fied idle rpm.
a
a-Idle rpm Adjustment Screw
Idle rpm in Forward Gear
45 hp 850 ± 25 rpm
40/50 hp 725 ± 25 rpm
4. Rev engine 2 or 3 times and allow to idle for 15 seconds.
• If the engine holds a stable idle condition, then no other adjustments are necessary.
• If the engine has an unstable idle condition, then carburetor synchronization is re-
quired. Refer to Carburetor Synchronization following.
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