5D-14 - WEBER 4 BARREL CARBURETOR 90-823225--1 1096
Thunderbolt V Equipped Engines
ADJUSTING IDLE MIXTURE
The procedure for adjusting carburetor idle mixture
can be found in the appropriate engine service manu-
al. This procedure also requires that the ignition mod-
ule be locked in the “Base Timing Mode”.
IMPORTANT: In order to properly set idle mixture,
the ignition module MUST BE locked in the “Base
Timing Mode”. This is necessary because of the
“Idle Speed Control” feature that exists in the
ignition module. See information on the previous
pages about this feature.
1. Using a jumper wire, connect the ignition system
timing lead “13” (PUR/WHT wire) to a good en-
gine ground (–). This locks the ignition module
into the “Base Timing Mode”.
2. Adjust idle mixture following the procedure in the
appropriate engine service manual.
3. Remove the jumper wire from the timing terminal.
ADJUSTING ENGINE IDLE SPEED
This procedure should be done with boat in the water,
drive unit in neutral and engine at normal operating
temperature. Refer to the Operation and Mainte-
nance Manual for the correct idle speed.
1. Disconnect the throttle cable from carburetor.
IMPORTANT: In order to properly set idle speed,
the ignition module MUST BE locked in the “Base
Timing Mode”. This is necessary because of the
“Idle Speed Control” feature that exists in the
ignition module. See information on the previous
pages about this feature.
2. Connect a shop tachometer to engine.
3. Using a jumper wire, connect the ignition system
timing lead “13” (PUR/WHT wire) to a good en-
gine ground (–). This locks the ignition module
into the “Base Timing Mode”.
4. Start engine and allow it to reach normal operat-
ing temperature. Place the remote control lever
in forward gear, idle position.
5. Adjust idle speed to recommended RPM.
6. Stop engine. Readjust cable barrel and reinstall
the throttle.
IMPORTANT: Be sure to disconnect the jumper
wire from the ignition system test terminal before
attempting to resume normal operations. If the
jumper wire is left in place, the ignition module
will operate in the “Base Timing Mode”. This
means that the additional timing advance fea-
tures would not be functioning.
7. Remove the jumper wire from the timing terminal.
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