CARSON X8N Chassis
21
GB
f. Showtime... almost!
Engine break-in is the most important step to assuring that your
engine is fast and reliable throughout its life. Put simply: DON’T SKIP
THIS PART!
The engine is pre-set from the factory for break-in. Use a “FAT BONE” 50
090 5034 or platform and place the car so that the wheels are off the
ground and free.
Make sure the throttle is set at neutral with your radio. Place the glow
heater onto the glow plug and give the recoil a sharp pull (picture 4).
Do not pull it more than twelve inches! More than that may break the
cord and this is not covered under warranty. It is better to give the
recoil short sharp pulls rather than long ones. If the pull-start cord gets
stuck, rotate the flywheel a little bit with your finger. This should make
the cord automatically recoil. Within a few pulls, the engine will start
with a good puff of smoke.
If the engine has trouble idling at the rich setting, turn the idle screw
clockwise 1/8th of a turn at a time. This will increase the idle allowing
the car to break-in properly. Try to do this in a well-ventilated area,
such as your driveway. Unburned oil from the fuel will accumulate
under the exhaust, so be prepared. Let the car idle like this for 2 - 3
tanks of fuel checking the engine temperature every 2 minutes. Please
allow a break of 10 – 15 in between filling the tank to allow the engine
to cool down. You should be able to touch the head of the engine with
your fingertips and it will be hot, but not uncomfortably so. (Attention!
Do not touch!) If it seems very hot, richen (turn counter-clockwise)
the high-end and low-end needles 1/8th of a turn. Always use small
increments when making these kinds of adjustments.
Racer Tip:
Factory setting of carburettor:
With the following basic adjustment the engine starts immediately,
running perfect and rich enough (outside temperature 8°C).
• Idle stop screw: approx. 1 mm air gap;
• High speed needle valve: screw in completely, then open 4 full
turns;
• Low speed needle valve (linking): flush with the edge of the linking
arm, then 1 full turn clockwise;
After run-in is finished the high speed needle valve should be open at
least 3 and 1⁄4 turns. A richer setup is better if outside temperature is
high.
Racer Tip:
Drive your car slowly with the rich setting shortly after the break-in
period avoiding prolonged periods at full throttle. Gradually lean out
the mixture 1/8 of a turn at a time. The idle will increase the more you
lean the engine out.
Picture 4
rich
lower
rich
lower
low
RPM
high
RPM
Picture 5
Picture 6
Summary of Contents for X8N Chassis
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