19
FINE-TUNING THE CARBURETOR
After your engine has been properly broken in and tuned at the track, be aware that changes in weather (temperature,
humidity, barometric pressure), altitude, and fuel nitro content will affect the performance of the engine. See the table below
for guidelines on how to adjust your engine’s carburetor settings to compensate for these various changes.
When…
does this…
change main needle setting…
Temperature
decreases
richer
increases
leaner
Humidity
decreases
slightly richer
increases
slightly leaner
Barometric pressure
decreases
leaner
increases
richer
Altitude
lower
richer
higher
leaner
Fuel nitro content (%)
lower
leaner
higher
richer
ENGINE TROUBLESHOOTING
Engine spins but will not start:
• Make sure your glowplug starter is fully charged and is properly connected to the glowplug. If the starter is fully charged,
replace the glowplug.
• Verify that fuel is getting to the carburetor. Remove the fuel line from the carburetor and see if there is fuel in it.
• Check your carb settings. It may be necessary to adjust the carb settings if the weather has significantly changed since
the last time you ran the engine.
Summary of Contents for NT18 0.8cc
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