Evolution-engines EVOE33GX Manuel d'utilisateur télécharger pdf (Page 13)

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13

Once the engine is running reliably at full

(open) throttle:

1. Turn the high-speed needle clockwise 1/16

of a turn at a time.

2. Wait 2–3 seconds for the engine to

respond.

a. If there is an increase in RPM: Turn the

high-speed needle clockwise an

additional 1/16 turn and wait for the

engine to respond to the tuning change.

If there is no increase in RPM after the

change, turn the high-speed needle back

to its previous position.

b. If there is a decrease in RPM: Turn the

high-speed needle counterclockwise 1/8

of a turn and wait for the engine RPM to

stabilize.

3. Repeat Step 2 until you determine the

maximum RPM with the fuel and propeller

you selected.

4. Enrich the high-end fuel mixture by turning

the high-speed needle counterclockwise

until the RPM is 200–300 RPM below maxi-

mum. This will allow the engine to achieve

proper fuel mixture during ﬂight.

High-Speed Needle Tuning

Low -Speed Needle Adjustment

The low-speed needle adjustment controls the fuel/air mixture at idle and the quality of the

transition between idle and wide open throttle.

Low -Speed Needle Tuning

1. Adjust the high-speed needle for the cur-

rent conditions.

2. Allow the engine to idle for 10–15 seconds.

Rapidly advance the throttle from idle to

full open. If the engine transitions with

no hesitation, the low-speed needle is

adjusted perfectly. If the engine slowly

responds to throttle change and gradually

reaches peak RPM, the low-end fuel mix-

ture is too rich. Turn the low-speed needle

clockwise 1/16 turn to lean out the low-end

fuel mixture and test again.

If the engine stops running, the low-end

fuel mixture is too lean. Enrich the low-end

fuel mixture by turning the low-speed

needle counterclockwise 1/16 turn and

test again.

3. When the low-speed needle adjustment

is correct, check the high-speed needle

setting again.

4. When you are satisﬁed with the needle

settings, you should not need to adjust the

mixture needles again.

The best indication that your engine is tuned

properly is the color of the spark plug when

you remove it from the cylinder. A nice, dry,

tan color is an indicator that the fuel mixture

is correct and burning well. Wet plugs or

carbon deposits generally indicate that the

engine is running too rich. If the spark plug

has a white or gray appearance, you are run-

ning your engine too lean.

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