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Nitro
Engine Tuning by Josh Cyrul
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Nitro Engine Tuning Tips by Josh Cyrul
Here is a quick summary of an article by Josh Cyrul on
tuning nitro engines for racing. It involves 3 basic steps: 1) Clearing
the engine, 2) tuning the bottom end, and 3) tuning the top end.
I. Clearing the Engine
These 4 steps will clear the engine of debris in
preparation for race tuning.
- Raise idle to 1/4 turn. This will help prevent engine
from stalling. This is the idle screw and not the low-end needle.
- Get engine temperature up to 150 degrees.
- Richen top end by a full turn.
- Holding carburetor wide open, continue richening top
end until engine nearly stalls. This flushes out dirt, residue, or
after-run oil from the carb and engine.
II. Begin Tuning the Bottom End
- First tune the bottom end.
- Listen to the idle.
- If idle slows and engine stalls, lean out the
bottom-end needle.
- But if the idle speeds up, richen out the bottom-end
needle.
- Set engine to idle for at least 1 minute before
engines starts to stall.
- Once idle is consistent for 1 minute, lower idle
screw setting as much as possible until engine stalls. Then open up
idle screw setting by 1/8 of a turn.
- Engine should now idle consistently for at least 45+
seconds.
III. Begin Tuning the Top End
- Open to full throttle for no more than 2-3 seconds,
then return to idle.
- Listen to engine and lean it out (top-end needle)
until you hear a nice clean sound.
- Open the carb to full throttle for 2-3 seconds.
- Close the carb for 2-3 seconds.
- Open the carb to full throttle for 2-3 seconds.
- Engine should rev nice and clean during steps 3 to 5.
If engine hesitates, it is too lean. If lean, richen the top-end
needle.
Hope these tips help you out.
Joel M
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