Radiosistemi rr8 Assembly instructions

Build Tips
& Tricks
This is a comprehensive build guide intended to help Radiosistemi owners build their new RR8 kits. We will
be outlining several tips and suggestions that we have found to be beneficial while assembling these kits.
Some of those tips will aide with such things as build speed and ease, while some will focus on kit
maintainence and durability. While we will cover a large portion of the build, it is intended only to provide tips
to ease your build. This guide is NOT intended to replace the instruction manual, only supplement.
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M3x10
X2
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M3x8
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M3x10
X6
12
13
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TCCE25X10
M2,5x10
X2
X3
M3x3
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THROTTLE & BRAKE LINKAGE SET 0133023
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M3x12
M3x4
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M3x10
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5X8X2.5

RR8 Build Tips & Tricks
Pre-Build Assembly
Pivot Balls - It is recommended to assemble the pivot balls the night before you plan to build your kit. This will
allow time for the thread locking compound to setup and harden. The parts are located in Bag 03.
Before assembling the pivot balls, note that
one side of the ball has a flat area. This will
be the side we screw the stud into.
Apply a liberal amount of red thread lock to the
studs. You can also use green compound for a
more permanent solution, however this will
make disassembly challenging.
Spin the ball onto the stud, snugging the ball
down tightly.

RR8 Build Tips & Tricks
Pre-Build Assembly
Pivot Balls - It is recommended to assemble the pivot balls the night before you plan to build your kit. This will
allow time for the thread locking compound to setup and harden. The parts are located in Bag 03.
Install the M3 screw into the end of the stud.
This screw is used as a safety mechanism to
prevent the balls from working loose. Apply
red thread lock to this screw as well.
Although unnecessary, you may choose to
sand the edges of the screw down.
Allow the thread lock to setup for 24 hours. If
you cannot or do not wish to wait, you may
continue on using caution to avoid
unscrewing the ball from the stud.
(Continued)

RR8 Build Tips & Tricks
Shocks
Note: Several steps of the assembly have been omitted.
Insert the O-Rings into the spring
adjustment nuts. Slide one side of the
O-Ring in, and then push the other side in
with your finger nail.
To thread the shock shafts into the shock
ends, without risk of marring the shaft with
pliers, you can simply install the nut on the
upper piston thread. Use a 5mm hex wrench to
spin the nut and shaft into the lower shock
end. The nut will come off quite easily once the
shaft is fully threaded into the shock end.
There are two sides on the plastic shock
ends. One is rough and one has a flat
circular area. You want to insert the ball
through the side with the flat area.

RR8 Build Tips & Tricks
Shocks
Note: Several steps of the assembly have been omitted.
Use a pair of flat needle nose to install the
balls into the ends. This will prevent marring
of the plastic.
Shafts fully assembled.
Assemble the lower shock seals. Note the
order of the O-Rings and Bushings. I
greased both O-Rings and the middle
bushing. I did not grease the outer bushing
to prevent dirt accumulation.

RR8 Build Tips & Tricks
Shocks
Note: Several steps of the assembly have been omitted.
If you happen to slide a loose O-Ring over a
shock shaft, you'll notice the O-Ring is
oversized. Not to worry.
The seal is designed this way. When the
O-Rings are inserted into the shock body, they
squeeze down to the proper size. This creates
an ideal seal that will last much longer and
provide better performance vs. using an O-
Ring that is sized to the shaft.
The shock pistons are tapered delrin and are
drilled to 6x1.3mm. Install the taper down to
give a little better pack over the large jumps.
If your track is rough, you may consider
installing the taper up to give a softer
compression.

RR8 Build Tips & Tricks
Differentials
Note: Several steps of the assembly have been omitted.
Quickly check and set backlash by
assembling the diff case and the bevel gear.
Make sure to use the blue diff gasket so the
gear and case will be the correct assembled
width. Do not install any internals yet.
Add shims and the 8x14 bearings to the diff.
You also need to install the 8x16 bearings and
the pinion gear into the bulkhead.
With the pinion and diff installed into the
bulkhead, press on the bearings with your
fingers (holding the gears tight) and check
backlash. You want the gears to rotate
smoothly, with no notchiness and minimal
play. I used one .2mm shim on the gear side,
no shim on the case side. If you need to add
or change the shimming, you can do so now
without having to disassemble the entire
diff. DO THIS FOR BOTH F & R DIFFS.

RR8 Build Tips & Tricks
Differentials
Note: Several steps of the assembly have been omitted.
Apply a thin bead of grease around the
outdrives, especially around the secondary
seal. You also need to apply grease to the O-
Rings.
Grease all O-Rings.
Applying grease to the washer behind the
large internal gears will help prevent oil
seepage. Only grease one side, install shims
so the grease faces O-Rings.

RR8 Build Tips & Tricks
Differentials
Note: Several steps of the assembly have been omitted.
After the outdrives, seals and cross pins are
installed into the differential case, you will
need to install the set screw into the case to
seal it off. Put a small dab of CA glue onto
the set screw to provide a secondary seal
against oil seep.
Install the set screw into the case. The set
screw should be flush with the outside of the
case.
Lower diffs assembled.

RR8 Build Tips & Tricks
Differentials
Note: Several steps of the assembly have been omitted.
Install the diff gaskets into the bevel gears.
The fit is tight enough to hold them in place
until the gears are installed on the case.
Several steps of the build were omitted in this
tips guide. You will need to complete assembly
of the differentials. 5000cst Front and 3000cst
Rear oil is recommended.
(Continued)