Shock Tuning
Shock Pistons
The shock pistons can be replaced with
the available optional pistons to vary
the amount of damping. Optional
pistons with bypass holes that are
larger or smaller (1, 2, or 3) than the
factory installed stock pistons can be
used to decrease or increase damping
respectively. Change the pistons if you
only have one weight of shock oil
available to you. From the factory, Revo
is equipped with #1 pistons in the front
and #2 pistons in the rear.
Shock disassembly
The shocks must be removed from
the vehicle and disassembled to
change the pistons. Use the shock
exploded views included with the
model to aid in the assembly process.
1.
Remove the spring and lower
spring retainer from the shock.
2.
Remove the shock cap (A) and
empty the shock body of shock oil.
3.
Remove the lower cap (B) and
the x-ring from the shock body.
4.
Use side cutters to grip the shock
shaft just above the rod end (C). Remove the rod end from the shock
shaft using the suspension multi tool (C).
5.
Remove the shock shaft with piston from the shock body out through
the top of the shock body.
Shock assembly
1.
Replace the stock piston with desired optional
piston. Be careful not to lose the small washer
located below the piston.
2.
Position the new piston onto the shock shaft
above the small washer. Grip the threads of
the shaft with side cutters or needlenose pliers
and tighten the nut with the 4-way wrench to secure the assembly.
3.
Insert the shock shaft assembly through the shock body until the
piston bottoms out.
4.
Lubricate the shaft and x-ring with silicone oil.
5.
Install the x-ring over the shaft and into the bore of the shock body.
6.
Install the lower cap using the suspension multi tool (B).
7.
Slide the bump stop onto the shaft.
8.
Grip the shaft close to the threads with needle nose pliers or side
cutters and thread the rod end onto the shock shaft until the rod end
bottoms out (C).
9.
Fill the shock with new silicone shock oil up to the top of the
shock body. Slowly move the piston up and down (always keeping it
submerged in oil) to release the air bubbles. Let the shock sit for a
few minutes to allow any remaining air bubbles to surface.
10.
Slowly thread the upper cap with the installed shock bladder onto the
shock body with the suspension multi tool (A). The excess oil will bleed
out of the small hole in the shock cap. Tighten the shock cap until
snug. Use the included steel shock wrench to hold onto shock body
while tightening.
11.
Reinstall the spring and lower retainer.
Transmission and Differential tuning
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 chart on page 45 for possible gearing combinations
Adjusting the Two-Speed Ratios
Revo is equipped to allow adjustment to the 2-speed by installing optional
close and wide-ratio gearsets. This requires transmission removal and
disassembly (see www.Traxxas.com for detailed instructions). The close
ratio gearsets will reduce top speed slightly but will provide more powerful
acceleration by reducing engine rpm loss when shifting from 1st gear to
2nd gear. The wide ratio gear set is designed for wide open areas and will
increase top speed, but reduce acceleration due to greater RPM loss when
shifting gears.
44 • Revo
Advanced Tuning Adjustments
A. Tighten/Loosen Upper Cap
C. Remove/Install Rod End
B. Tighten/Loosen Lower Cap
Multi-tool Shock Functions
2
2
2
1
1
1
3
3
3
Shock Piston Hole Sizes
Piston 1: 1.10 mm
Piston 2: 1.00 mm
Piston 3: 0.95 mm
Never slide the threads on
the shock rod past the
X-ring seal when it is
installed and compressed
by the bottom cap of the
shock. Doing so will
damage the seal and cause
shock oil to leak.
Piston Installation/Removal
