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Basic Tuning Adjustments
Adjusting the Two-Speed Transmission
Revo comes equipped with an adjustable two-speed transmission. When
Two Speed Adjustment
the shift point on the transmission is adjusted correctly, it will maximize
note: If the truck will not roll
acceleration and improve drivability. Use a 2mm hex wrench
forward while the spur gear
to adjust the shift point. To make the adjustment, the engine must be off
is held, the transmission
(not running).
may still be in reverse gear.
1. Shift the transmission into forward gear
For adjusting two-speed
2. Remove the rubber access plug from the
and gear ratios see
Advanced Tuning
3. While looking through the opening,
Adjustments on page 44.
4. Hold the spur gear and slowly roll the
5. Insert the 2.0mm hex wrench
6. Turn the adjustment screw 1/8 turn
7. Reinstall the rubber access plug to prevent dirt from entering the
8. Check performance by running a test lap after each adjustment. On a
38 • Revo 3.3
(shift button down).
top of the transmission housing.
rotate the spur gear to align the cutout
(notch) on the internal two-speed clutch
drum with the opening.
truck forward until the hex on the black
adjustment set screw becomes visible in
the opening. Note: the truck will only roll
forward (not backwards) when the spur
gear is held stationary.
through the clutch drum and into
the adjustment screw.
counter clockwise to lower the shift
point (shifts sooner). Be careful not to
loosen the adjustment screw too much
or you may cause the screw and spring
to fall out (requiring major disassembly
and repair). Turn the adjustment screw
clockwise for later shifts.
transmission. Do not put oil or other lubricants into the transmission
through the two-speed adjustment access.
small race track with many tight turns, try setting the shift point later so
that the truck only shifts into second gear on the main straightaway. This
will prevent an unexpected shift in the middle of a turn. On larger tracks
it may be necessary to allow earlier shifts for increased speed.
Adjusting the Spur Gear/Clutch Bell Gear Mesh
The ideal spur gear/clutch bell gear mesh for
Revo is 0.1mm. To set the gear mesh, place a
strip of standard letter/A4 size copy or printer
paper (about 0.1mm thick) between the
mating teeth. Loosen the two horizontal
engine mount screws and slide the engine
mount up to push the clutch bell gear against
the spur gear so that the that the paper is not
too tight to pull out or too loose that it will fall
out. Tighten the two horizontal engine mount
screws securely. When the paper is removed,
you should feel only the slightest amount of
play between the gears (almost none) and
there should be no binding or friction.
Changing the Spur Gear
1. Remove the four cap head screws that
secure the engine to the engine mount.
2. Remove the button head screw that
secures the pipe hanger to the rear body
mount (see inset).
3. Carefully remove the engine and exhaust
system from the spur gear area to allow enough
room to remove the spur gear.
4. Remove the three screws on the slipper clutch
assembly using a 2.5mm hex wrench. Slide the
Shift
Sooner
spur gear off of the slipper shaft. If the spur gear is
too tight on the shaft, gently pry on the back of
the gear with a flat screw driver to loosen it.
Repeat the above steps in reverse order to install the new spur gear.
Dual Servo Steering System
Revo uses dual-servo steering and a single heavy-duty servo saver for
powerful, responsive steering. To prevent unnecessary receiver battery
drain it is important to make sure that the servos are "at rest" when the
steering is at neutral. If one servo is out of adjustment, then both servos
will work against each other, fighting to find center.
Adjusting The Steering System
1. Remove the servo horns and steering links from the servos.
Disconnect the steering links from the servo saver.
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