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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 driveability. Use a 2mm hex wrench to adjust the
shift point. To make the adjustment, the engine must be off (not running).
1. Remove the rubber access plug from
the top of the transmission housing.
2. While looking through the opening,
rotate the spur gear to align the cutout
(notch) on the internal two-speed clutch
drum with the opening.
3. 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.
4. Insert the 2.0mm hex wrench through the
clutch drum and into the adjustment screw.
5. 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.
6. 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.
7. 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 (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
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.
Adjusting the Gear Ratio
The gear ratio on Revo can be adjusted for different conditions that may
require either increased acceleration or increased top speed. Adjusting the
gear ratio is accomplished by changing the clutch bell on the engine and/
or the spur gear (slipper clutch gear) on the transmission. From the factory,
Revo is equipped with a 15-tooth clutch bell and a 38-tooth spur gear. This
combination will provide a good balance of acceleration and top speed.
Optional spur gears and clutch bell gears are listed on your parts list. Refer
to the gear ratio chart for possible gearing combinations.
Adjusting the Two-Speed Ratios
Revo is equipped to allow adjustment to the two-speed by installing
optional standard and wide-ratio gearsets. This requires transmission
removal and disassembly (see www.Traxxas.com for detailed instructions).
The standard ratio gearsets will increase top speed slightly. The optional
wide-ratio gear set can also be installed in the Revo. The additional
horsepower and torque output of the TRX 3.3 engine provides seamless
shifting even with the larger gap between first and second gears. The gear
ratio chart shows the available combinations with optional spur gears,
clutch bells, and two-speed gear sets.
Shift
Sooner
TUNING ADJUSTMENTS
Gear Ratio Chart
With 14T Clutch Bell
# of Spur Gear Teeth
2nd gear sets
Gear
17T/39T
1st
24.21
(Standard)
2nd
16.79
16T/40T
1st
24.21
(Close)
2nd
18.30
18T/38T
1st
24.21
(Wide)
2nd
15.45
With 15T Clutch Bell
# of Spur Gear Teeth
(standard)
2nd gear sets
Gear
17T/39T
1st
22.59
(Standard)
2nd
15.67
16T/40T
1st
22.59
(Close)
2nd
17.08
18T/38T
1st
22.59
(Wide)
2nd
14.42
With 16T Clutch Bell
# of Spur Gear Teeth
2nd gear sets
Gear
17T/39T
1st
21.18
(Standard)
2nd
14.69
16T/40T
1st
21.18
(Close)
2nd
16.01
18T/38T
1st
21.18
(Wide)
2nd
13.52
With 17T Clutch Bell
# of Spur Gear Teeth
2nd gear sets
Gear
17T/39T
1st
19.94
(Standard)
2nd
13.83
16T/40T
1st
19.94
(Close)
2nd
15.07
18T/38T
1st
19.94
(Wide)
2nd
12.72
*stock configuration out of the box
REVO PLATINUM EDITION • 15
36
38
40
25.55
26.90
17.72
18.66
25.55
26.90
19.31
20.33
25.55
26.90
16.31
17.17
36
38
40
23.85
25.10
16.54
17.41
25.10
23.85
*
18.03
*
18.97
23.85
25.10
15.22
16.02
36
38
40
22.36
23.54
15.51
16.32
22.36
23.54
16.90
17.79
22.36
23.54
14.27
15.02
36
38
40
21.04
22.15
14.60
15.36
21.04
22.15
15.90
16.74
21.04
22.15
13.43
14.14
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