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:vacuum gauge (4 column), hose clamp
,flat blade screwdriver, thin gloves
,needle nose pliers.
If the radiator fan comes on while you are syncing the carbs, it
will change your reference point. Some people disconnect the fan and
point a house box fan at the front of the engine/radiator to keep things
cool during synchronization. Others leave the radiator fan connected and
either use a new reference point when it comes on or they wait for it to
shut off and settle back to the original reference point.
The No.3 carb is the reference carb and cannot be adjusted –
all 5 of the other carbs are adjusted to read the same as No.3 carb.
Carb Location (the spark plug wires are also numbered as given
front to rear = 1, 3, 5
front to rear = 2, 4,
Thin gloves and angled needle nose pliers make getting the hoses
and caps back on much easier around the hot engine.
It is a good idea to check your vacuum gauge to be sure that all
four columns read identically when connected to the same vacuum source.
The line restrictors have been known to cause incorrect readings. You
can get 3 T’s or Y’s from a pet (aquarium) supply store and connect
all four vacuum gauge columns at one time to the No.3 intake manifold
– they should all read the same.
If you do not have a hose clamp, you could use a hemostat or
Be sure that the gauge and its hoses do not touch the hot exhaust
After starting the engine, be sure not to blip the
throttle rapidly when using mercury gauges as you can suck the mercury
into the engine!!! Let the throttle speed down slowly!
using the screwdriver to turn the adjustment screw, be sure to use light
pressure on the screw. Heavy pressure may affect the actual setting.
Honda specification calls for the carbs to be within 40mm (1.6
inches) of mercury, but you can do better – probably within 5 –
Some people prefer to balance the carbs at ~3000 rpm (cruising
If mercury got stuck in the vacuum gauge columns when you shut
the engine off, you can blow into the end of the vacuum gauge hose to
force the mercury back into the reservoir.
=No.3, 6, 4
Cap = No.1, 5, 2
17. Remove the clamp from No.6
18. Install the chrome linkage covers – 3 Phillips screws each.
Be sure to get the cable hooked on the front
inside of the left linkage cover when installing.
19. Take bike out for a test drive
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