8
water boils away in 3-5 seconds, the engine is within proper
operating temperatures. If the water boils away longer than
5 seconds, the mixture is set rich which is preferable when
breaking in the engine. Otherwise lean the mixture some
and retest after a minute of running.
The Overdrive ST is equipped with a reversing two-speed
transmission.To operate the reversing unit on the Overdrive
ST simply bring the Overdrive ST to a stop and flip the
switch located on the top if the transmitter. To switch the
Overdrive ST back into forward motion, simply bring the
Overdrive ST to a stop and flip the switch back.
The shift point on the 2-speed transmission is factory set.
However, you can make adjustments to the shift point on the
2-speed transmission. When you make shift point
adjustments, it is important that your engine has already
been broken in, is properly tuned, and already at proper
operating temperature.
To adjust the shift point use the following procedure:
❏ 1.Warm up the engine (run it for a minute or two) and then
stop the engine (see How to Stop Your Engine on page 14.)
❏ 2. Rotate the 2-speed outer housing attached to the
smaller spur gear so that the access hole is up.
❏ 3. Rotate the outer housing back and forth until you can
see a small set screw on the inner housing. This set screw
does not go straight down into the inner housing. It is set at
an angle. This is the adjustment screw for the shift point.
❏ 4. Insert a 2mm allen wrench into the set screw.
❏ 5. To raise the shift point (make it shift later, when the
engine develops more RPM), turn the screw clockwise 1/8
of a turn. Do not overtighten this screw or you may damage
the 2-speed transmission.
❏ 6. To lower the shift point (make it shift earlier) turn
the screw 1/8 of a turn counter clockwise. Do not loosen
this screw too much. The screw could fall out, requiring
disassembly of the entire 2-speed transmission to repair.
❏ 7. Do not make adjustments more than 1/8 of a turn. After
each adjustment, start the engine and test the shift point. If
you have made adjustments to the shift point and want to
return to the factory setting, it is 5.5 turns out from the point
that the screw will not turn in any more without using
excessive force.
It is possible to have the shift point too far in. In this case,
the inner clutch on the 2-speed is locked such that only the
two inner gears (the gears for top speed) will be engaged
during the run and the outer gears (the gears for good
acceleration) will not be engaged at all. It is also possible to
have the shift point too far out, which will mean that you are
only running the acceleration gears. In either case you will
not hear the car shift. Make sure that you listen carefully for
the RPM change of the engine that signifies that the
2-speed transmission is shifting.
BEFORE EACH RUN:
❏ 1.Check to make sure that all screws are tight and there
are not any screws missing.
❏ 2.Check to make sure that the transmitter and receiver
batteries are not low.
❏ 3.Check to make sure that all of the moving parts of the
Overdrive ST move freely and do not bind.
❏ 4.Check for broken or damaged parts. Replace any
broken or damaged parts before running the Overdrive ST.
Running of the Overdrive ST with broken or damaged parts
could result in damage to other parts.
❏ 5. Inspect the air cleaner for a torn or damaged element.
Also look for dirt in the air cleaner element and wash it if
necessar. Then re-oil the filter and reinstall it.
❏ 6. Check the fuel tank and fuel lines for leaks.
AFTER EACH RUN:
❏ 1.Clean any large globs of dirt or debris from the chassis
and moving parts.
❏ 2.Place a small amount of after run engine oil into the
engine if the engine will be sitting for a long period of time
before the next use.
❏ 3.Check for any broken or damaged parts.This way parts
may be replaced before the next run.
AFTER EVERY 10 RUNS:
❏ 1. Check to make sure that the bearings are free of dirt
and debris, and roll smoothly.
❏ 2. Check the shocks for oil leakage. If the shocks have
leaked any shock fluid out, you should properly refill the
shocks for best performance.
MAINTENANCE TIPS
2-SPEED ADJUSTMENT
REVERSING TRANSMISSION
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