Cirrus 3CFM Instrukcje Operacyjne Pobierz pdf (Strona 12)

Page 12

Refer to the photo at left to familiarise yourself with your engine's carburettor. All of the

carburettor settings come preset from the factory for initial starting and break-in, but you

should have a small at blade screwdriver handy to make adjustments to the carburettor

during the break-in process, which will be detailed later.

CARBURETTOR FAMILIARISATION

The idle stop screw adjusts the closure of the carburettor barrel. The idle stop screw should

be adjusted so that the carburettor barrel stays open about 1mm / 1/16". Turning the idle

stop screw clockwise will cause the carburettor barrel to stay open more. Turning the idle

stop screw counterclockwise will allow the carburettor barrel to close more. If the carburettor

barrel stays open too far, the engine will idle very high and the clutch will never disengage.

This will wear out the clutch very quickly. If the idle stop screw is closed too far, the engine

may die during idle or when you engage the brakes. Ideally, the engine should idle smoothly,

yet slow enough so that the clutch stays disengaged.

IDLE STOP SCREW

The high speed needle valve is preset from the factory for the initial starting procedure.

Do not make adjustments to it at this time. The high speed needle valve is used to

meter the air/fuel mixture at full throttle. Turn the needle valve clockwise to lean the

mixture or turn the needle valve counterclockwise to richen the mixture.

Check to ensure that the high speed needle valve is set at 3 full turns out from

the fully closed position for the break-in process.

HIGH SPEED NEEDLE VALVE

The low speed needle valve is preset from the factory for the initial starting procedure.

Do not make adjustments to it at this time. The low speed needle valve meters the

air/fuel mixture at idle and during transition from idle to full throttle. Turn the needle valve

clockwise to lean the mixture. Turn the needle valve counterclockwise to richen the

mixture. The low speed needle valve is preset from the factory, but minor adjustments

may need to be made to suit your application: fuel used, glow plug and environment all

contribute to the setting. 





AFTER THE ENGINE HAS BEEN BROKEN IN.

LOW SPEED NEEDLE VALVE

Low Speed

Needle Valve

High Speed

Needle Valve

Idle Stop

Screw

RESETTING THE HIGH AND LOW SPEED NEEDLE VALVES TO THE FACTORY SETTINGS

There may come a time when you get the needle valve settings out of spec, resulting in poor engine performance or not even being able

to start the engine at all. If this occurs, reset both the high and low speed needle valves to their factory settings as described below:

RESETTI

NG THE HIGH SPEED NEEDLE VALVE

Gently turn the high speed needle valve clockwise until it bottoms out (fully closed).

Do not force it or you may damage the carburettor.

Turn the high speed needle valve counterclockwise (open) 3 full turns.

RESETTING THE LOW SPEED NEEDLE VALVE

Open the carburettor barrel completely.

While holding the carburettor barrel open with your ngers, use a at blade screwdriver to gently turn the low speed needle valve

clockwise until it bottoms out (fully closed). Do not force it or you may damage the carburettor.

From this point, turn the low speed needle valve counterclockwise (open) 3 full turns.

IMPORTANT: The factory settings listed above are for break-in. Once the engine is broken in, the needle valve settings will be

different, although these settings are good for getting your engine running again. Please be aware that you will need to retune

your engine for proper performance.

1mm

Turn Clockwise

to Lean

Turn

Counterclockwise

to Richen

Turn Clockwise

to Lean

Turn

Counterclockwise

to Richen

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