32 • E-REVO VXL BRUSHLESS
ADVANCED TUNING ADJUSTMENTS
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, E-Revo is
equipped with #2 pistons in the front
and 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 a 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 a flat wrench to hold onto the shock body while
tightening.
11. Reinstall the spring and lower retainer.
Tuning The Sealed Gear Differentials
E-Revo’s front and rear gear differentials allow the left and right
wheels to spin at different speeds while turning so that the tires do
not scuff or skid. This decreases the turning radius and increases
steering performance.
The performance of the differentials can be tuned for different driving
conditions and performance requirements. The differentials are filled
with silicone differential fluid, and are sealed to maintain consistent
long-term performance. Changing the oil in the differential with either
lower or higher viscosity oil will vary the performance characteristics of
the differentials. Changing to a higher viscosity oil in the differential will
reduce the tendency for engine power to be transferred to the wheel
with the least traction. You may notice this when making sharp turns
on slick surfaces. The unloaded wheels on the inside of the turn have
the least traction and tend to spin up to extremely high rpms. Higher
viscosity (thicker) oil causes the differential to act like a limited-slip
differential, distributing more equal power to the left and right wheels.
E-Revo will generally benefit from higher viscosity oil when climbing,
rock crawling, or racing on low traction surfaces.
A. Tighten/Loosen Upper Cap
C. Remove/Install Rod End
B. Tighten/Loosen Lower Cap
Multi-tool Shock Functions
Piston Installation/Removal
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.
