Take the car apart and start with the
guide. Replace the braid. Make sure
the braid is flat and smooth. The braid
should make good contact with the track
but it should not push the car up.
Take the front tire off the rim and inspect
for smoothness. There should be no
flashing or any rough spots that would
cause tire to be out of round. If there are
any rough spots, sand down the rim by
putting the rims on an axle and use a
dremmel at low speed. Make sure the sand
paper is flat.
Next, put the tire on the rim and make sure
it is smooth. If not, lightly sand down the
tire. The front tires being smooth are very
important to a non-magnet car. In the
turns, the car leans on the front tire. If it is
out of round, you will have a vibration
causing poor handling.
Next, move to the rear bushings.
Use brass bushing as these have
the best fit to the axle and the
smallest amount of play. I
recommend drilling part of the
bushing out.
- 1 -
Use a drill larger than 3/32 but do not
drill all of the way through the bushing.
This helps to minimize any axle
binding.
Glue your bushings to the chassis. I use
super glue. Put some on the bottom of the
bushing. If you ever have to remove the
bushings, you can cut the glue with a razor
knife.
Next, check for play in the rear
bushings. Insert the axle you are going
to use and move the axle up and down,
forward and backward. If you have any
play, you can eliminate in by the
following steps:
1) Put a very small amount of super glue in the
bushing.
2) Take an axle with one wheel installed on it and
lightly oil the axle.
3) Insert the axle through both bushings and
quickly spin the axle.
- 2 -
For the next step, you will need some type
The axle should feel very tight
spinning but you should be able to
turn the axle. If the axle binds, the
super glue can be removed by
scraping it with a hobby knife. Start
the process over again until you get it
right. Perform this for both bushings.
of abrasive. I use polishing compound for a
car but tooth past will also work.
1) Cover the axle with the abrasive and put
some in the bushings.
2) Chuck the axle in the dremmel and push
through both bushings. You will feel some
resistance as you put the axle through the
bushings.
3) SLOWLY start to spin the axle. Be
careful not to spin it too fast as it will break
the bearing loose from the chassis.
4) Work the axle in and out and slowly
increase the dremmel speed. Slowly work
up to full speed making sure to go in and
out with the axle.
5) Remove the axle and clean the abrasive
from the chassis, bushings and axle.
6) Oil the axle and slide into the bushings.
7) Check for play again.
You should find no play in your axle but it
will slide easily through the bushings!
- 3 -
Your next step is to install
your rear tires and gear. I
highly recommend using Slot
It rims as they are true and
you have a wide selection of
tires and sizes to use. I also
recommend using only Slot It
S1 or PPR tires as they seem
to have the most grip for both
wood and plastic tracks.
Please note if you are using a
sidewinder, you should
purchase the taller rims to
make sure you have enough
clearance for the gear.
Your front tires play a very important role in the handling of your car. Install your
front tires and rims on your car and check to see if there is any up and down
play. If there is, take steps to support the front axle so there is no movement.
Here is an example:
1) Using styrene, drill 3/32 holes to act
as bushings.
2) Put the axle through the styrene and
install the rims and tires on the axle.
Install the front axle assembly onto the
chassis.
3) Set the chassis on a test block with
your guide and new braid installed
4) Push the wheels down so they are
touching the test block.
5) Superglue the new styrene bushings
in place.
6) Make sure the font tires are touching
the block the chassis appears level.
7) Lube the axle and spin the tires to
ensure the axle is not glued to the rim
You may find that a car which comes
equipped with some type of bushing
may still have play. This setup can be
used with almost any type of front end.
- 4 -
This next check is important and is the
key to the previous steps you have
taken. On a test block, push down on
the front corner of your car. Look at the
opposite rear tire. The tire should not
come off the track. The key here is the
front tires are clearly used as outriggers
to keep the rear planted on the track
when in a corner. Though this setup
may reduce your top speed as the front
tires may add drag, the handling gains
should offset your loss of top speed.
Using a test block, look closely at the
front tires. The front tires should be
clearly on the track with NO space
between the tire and the block. If
there is any space, make sure to
check that your braid is smooth.
Please note that this setup is good in a low grip situation which is most plastic or
non-glued wood tracks.
Next, hot glue your motor in place.
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