Specifications

throttle shaft return spring.

Warm the engine to operating temperature. Attach a vacuum gauge (damp until needles

still pulse slightly) or fluid manometer to the vacuum barbs or carb body fittings; if

vacuum barbs are used, set vacuum petcocks on "Prime." It is possible to reach the

synchronizing screw between the carburetors with a long screwdriver; if this is difficult

for you, the tank can be removed and a remote fuel supply can be used (see "Tools").

Open the throttle plate on the high vacuum side and close the one on the low vacuum

side until readings are even. Very small movements of the screw produce changes; you

only need to nudge it slightly to get results.

If you are using a fluid manometer (mercury sticks or ATF "yardstick" type), avoid

revving the engine; this can cause manometer fluid to be sucked into the engine. If one

side starts to climb rapidly, shut down the engine quickly and make a small adjustment,

and continue shutting down and restarting until readings are stable enough to let the

engine run while you make fine adjustments.

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