REVO 3.3 • 35
BASIC TUNING ADJUSTMENTS
Adjusting the Two-Speed Transmission
Revo comes equipped with an adjustable two-speed transmission.
When the shift point on the transmission is adjusted correctly, it will
maximize acceleration and improve drivability. Use a 2mm hex wrench
to adjust the shift point. To make the adjustment, the engine must be
off (not running).
1. Shift the transmission into forward
gear (shift button down).
2. Remove the rubber access plug from
the top of the transmission housing.
3. While looking through the opening,
rotate the spur gear to align the
cutout (notch) on the internal two-
speed clutch drum with the opening.
4. Hold the spur gear and slowly roll the
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.
5. Insert the 2.0mm hex wrench
through the clutch drum and into
the adjustment screw.
6. Turn the adjustment screw 1/8 turn
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.
7. Reinstall the rubber access plug to
prevent dirt from entering the transmission. Do not put oil or other
lubricants into the transmission through the two-speed adjustment
access hole.
8. Check performance by running a test lap after each adjustment. On
a 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.
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
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 digital waterproof steering servos 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. If the steering servos buzz or whine when the servos are
powered and in the neutral position with no load on the front wheels,
the servo linkage(s) should be adjusted.
Adjusting The Steering System
1. Remove the servo horns and steering links from the servos.
Disconnect the steering links from the servo saver.
Shift
Sooner
