TIMING, SYNCHRONIZING, & ADJUSTING
Page 2C-10 90-857046R1 NOVEMBER 2001
CAUTION
When using the old style mercury filled carb. tuner (91-809641A1) install filters (3)
in each line. This will prevent mercury from being drawn into carburetors during an
abrupt throttle change.
WARNING
When revving the engine move the throttle cam to increase RPM. Do not use remote
control or tiller handle twist throttle to increase RPM. If you do, the throttle linkage
will contact the bottom intake manifold hose adaptor and damage the fitting.
6. Rev engine a few times and let engine idle for 15 seconds. Check that the vacuum values
remain the same between cylinders. Re-adjust if necessary.
7. Stop engine, remove adaptors and reinstall plugs. Refer to Idle Speed Adjustment and
adjust the idle RPM back to specification.
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 water, start engine and allow to warm up. Shift the outboard to
forward gear.
2. With the outboard in forward gear, turn the idle adjustment screw located on the #3 (bot-
tom) carburetor to attain the specified idle RPM.
a
a-Idle RPM Adjustment Screw
3. Rev engine 2 or 3 times and allow to idle for 15 seconds.
a. If the engine holds a stable idle condition, then no other adjustments are necessary.
b. If the engine has an unstable idle condition, then carburetor synchronization is re-
quired. Refer to Carburetor Synchronization preceding.
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