There are three adjustments on CD, CDS and
CD2S carburettors: a throttle-stop screw, a jet-adjusting screw and a fast-idle
stop screw.The lifting pin is under the edge of the dashpot. If there is no
pin, lift the piston with a screwdriver.The lifting pin is under the edge of
the dashpot.If there is no pin, lift the piston with a screwdriver.stefa auto oil seals Price reduction.Check that
the choke is fully shut and that the fast-idle stop screw is clear of the choke
linkage. Hook your finger under the edge of the dashpot and press the lifting
pin upwards to raise the piston by about 1/32 in. (1 mm).
If there is no pin, take off the air filter and lift the piston 1/32 in. (1 mm) with a thin screwdriver. Listen to the engine note while you do so.auto oil seals. If the mixture is correct the engine speed should rise slightly for a moment, then return again to normal.If it rises and stays fast the mixture is too rich.
If the engine dies when the pin is lifted, it is too weak.
Use a coin to turn the jet-adjusting screw one-eighth of a turn at a time, waiting each time for the engine speed to settle down. Screwing upwards weakens the mixture, downwards enriches it.
Use a coin to turn the jet-adjusting screw one-eighth of a turn at a time, waiting each time for the engine speed to settle down. auto oil seals.Screwing upwards weakens the mixture, downwards enriches it.
Switch off the engine before adjusting the mixture, and check that the jet needle is central. Remove the air cleaner, lift the piston and let it fall. If the jet is central, the piston falls with a sharp click.
Keep the jet central while you adjust the mixture by taking the damper rod out of the top of the carburettor and pushing a pencil or soft metal rod firmly down the hole to hold the jet in place. Make sure that the jet remains centralised.
Start the engine and bring it up to working temperature.stefa auto oil seals Price reduction.
The mixture-adjusting screw is set centrally in the base of the carburettor on CD, CDS and CD2S models. It is brass and has a wide slot in it. Although a screwdriver can be used to turn it, a small coin is easier.
Lift the piston so that the needle is clear of the jet, and screw the jet adjusting screw up until the top of the jet is just above the top of the bridge in the carburettor bone.
Use a spanner to slacken the large nut just above the jet adjusting screw by half a turn. That releases the jet in its housing, but allows it to drop slightly.
Wind the jet adjuster up again until the top of the jet is level with the bridge. auto oil seals.Let the piston fall back gently so that the needle centralises the jet.
Remove the piston damper and hold the piston down with a pencil or soft metal rod slipped into the damper tube. Tighten the jet assembly. Check several times that the piston drops with a click.
Lift the piston while you adjust the height with a coin.Turn until the jet height is just above the bridge in the bone.Loosen the locknut to free the jet for adjustment.Screw the jet up until it is level with the ledge
Hold the jet central with a pencil when you tighten the locknut.auto oil seals..
Turn only an eighth of a turn at a time, then wait about 15 seconds for the engine speed to settle down. Lift the pin again and see whether the engine speed alters.
Screw the jet upwards (that is, anticlockwise looking down on the carburettor) to weaken the mixture, or down (clockwise) to make it richer.
With the mixture setting correct, the idling speed may now be too fast or slow. For most cars it should be 850-950 rpm – judge it by ear if your car does not have a tachometer (or rev counter). Adjust the idling speed by turning the throttle-stop screw.
If tuning fails to make the engine run properly, the carburettor may need cleaning (See Air filter change), or the air filter renewing.stefa auto oil seals Price reduction.
If there is no pin, take off the air filter and lift the piston 1/32 in. (1 mm) with a thin screwdriver. Listen to the engine note while you do so.auto oil seals. If the mixture is correct the engine speed should rise slightly for a moment, then return again to normal.If it rises and stays fast the mixture is too rich.
If the engine dies when the pin is lifted, it is too weak.
Use a coin to turn the jet-adjusting screw one-eighth of a turn at a time, waiting each time for the engine speed to settle down. Screwing upwards weakens the mixture, downwards enriches it.
Use a coin to turn the jet-adjusting screw one-eighth of a turn at a time, waiting each time for the engine speed to settle down. auto oil seals.Screwing upwards weakens the mixture, downwards enriches it.
Switch off the engine before adjusting the mixture, and check that the jet needle is central. Remove the air cleaner, lift the piston and let it fall. If the jet is central, the piston falls with a sharp click.
Keep the jet central while you adjust the mixture by taking the damper rod out of the top of the carburettor and pushing a pencil or soft metal rod firmly down the hole to hold the jet in place. Make sure that the jet remains centralised.
Start the engine and bring it up to working temperature.stefa auto oil seals Price reduction.
The mixture-adjusting screw is set centrally in the base of the carburettor on CD, CDS and CD2S models. It is brass and has a wide slot in it. Although a screwdriver can be used to turn it, a small coin is easier.
Lift the piston so that the needle is clear of the jet, and screw the jet adjusting screw up until the top of the jet is just above the top of the bridge in the carburettor bone.
Use a spanner to slacken the large nut just above the jet adjusting screw by half a turn. That releases the jet in its housing, but allows it to drop slightly.
Wind the jet adjuster up again until the top of the jet is level with the bridge. auto oil seals.Let the piston fall back gently so that the needle centralises the jet.
Remove the piston damper and hold the piston down with a pencil or soft metal rod slipped into the damper tube. Tighten the jet assembly. Check several times that the piston drops with a click.
Lift the piston while you adjust the height with a coin.Turn until the jet height is just above the bridge in the bone.Loosen the locknut to free the jet for adjustment.Screw the jet up until it is level with the ledge
Hold the jet central with a pencil when you tighten the locknut.auto oil seals..
Turn only an eighth of a turn at a time, then wait about 15 seconds for the engine speed to settle down. Lift the pin again and see whether the engine speed alters.
Screw the jet upwards (that is, anticlockwise looking down on the carburettor) to weaken the mixture, or down (clockwise) to make it richer.
With the mixture setting correct, the idling speed may now be too fast or slow. For most cars it should be 850-950 rpm – judge it by ear if your car does not have a tachometer (or rev counter). Adjust the idling speed by turning the throttle-stop screw.
If tuning fails to make the engine run properly, the carburettor may need cleaning (See Air filter change), or the air filter renewing.stefa auto oil seals Price reduction.
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