Difficulty

Moderate

Steps

17

Time Required

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1

  • Sterwins PHT25 4CC 55 CM Carburetor
  • 17 steps

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Step 1

              Necessary tools
  • A flathead screwdriver
  • A Phillips head screwdriver
  • A T25 torx wrench
  • A Carburetor Adjusting Hex Screwdriver

A flathead screwdriver

A Phillips head screwdriver

A T25 torx wrench

A Carburetor Adjusting Hex Screwdriver

1024

Step 2

              Remove the air filter
  • Unclip the air filter cover.
  • Extract the air filter.
  • Filter and carburetor case fixing screws

Unclip the air filter cover.

Extract the air filter.

Filter and carburetor case fixing screws

Step 3

              Dismantling the carburetor
  • In an anticlockwise movement, unscrew the two fixing screws using a T25 torx key.
  • Remove the two screws and then the filter case.
  • Remove the carburetor.

In an anticlockwise movement, unscrew the two fixing screws using a T25 torx key.

Remove the two screws and then the filter case.

Remove the carburetor.

Step 4

              Carburettor disassembly
  • Unhook the accelerator cable. Make sure to remember the location.
  • Extract the transparent fuel return hose.
  • Extract the black fuel inlet hose.

Unhook the accelerator cable. Make sure to remember the location.

Extract the transparent fuel return hose.

Extract the black fuel inlet hose.

Step 5

              Carburetor Disassembly 1/5
  • Unscrew the two priming pump attachment screws by turning them counterclockwise.
  • Remove the pump.
  • Peel off the pump membrane.

Unscrew the two priming pump attachment screws by turning them counterclockwise.

Remove the pump.

Peel off the pump membrane.

Step 6

              Carburetor Disassembly 2/5
  • Once the pump is disassembled, turn the carburetor 180° to access the four mounting screws.
  • Use a Phillips screwdriver to remove the four membrane cover screws.

Once the pump is disassembled, turn the carburetor 180° to access the four mounting screws.

Use a Phillips screwdriver to remove the four membrane cover screws.

Step 7

              Carburetor disassembly 3/5
  • Remove the membrane cover.
  • Remove the needle lever membrane with the membrane seal.
  • Note: The membrane lever will act on the needle lever.

Remove the membrane cover.

Remove the needle lever membrane with the membrane seal.

Note: The membrane lever will act on the needle lever.

Step 8

              Carburetor disassembly 4/5
  • Unscrew the screw that holds the needle lever shaft.
  • CAUTION: Be sure to hold the lever with your thumb to prevent the spring from popping out.
  • Remove the lever, the spring, and the needle.

Unscrew the screw that holds the needle lever shaft.

CAUTION: Be sure to hold the lever with your thumb to prevent the spring from popping out.

Remove the lever, the spring, and the needle.

Step 9

              Carburetor disassembly 5/5
  • Set screw
  • Unscrew the two adjustment screws counterclockwise using the specific adjustment screwdriver.
  • Extract the two screws.

Set screw

Unscrew the two adjustment screws counterclockwise using the specific adjustment screwdriver.

Extract the two screws.

Step 10

              Cleaning the carburettor in the tank
  • Immerse the carburetor in the ultrasonic bath for 15 to 20 minutes at a temperature between 25 and 35°.
  • Remove the carburetor from the ultrasonic bath.
  • Rinse the carburetor with water, dry it by blowing it out with compressed air.

Immerse the carburetor in the ultrasonic bath for 15 to 20 minutes at a temperature between 25 and 35°.

Remove the carburetor from the ultrasonic bath.

Rinse the carburetor with water, dry it by blowing it out with compressed air.

Step 11

              Carburetor reassembly
  • Reinstall the spring and needle.
  • Use a flat screwdriver to hold the lever in place.
  • Tighten the screw that holds the axis of the lever using a Phillips screwdriver.

Reinstall the spring and needle.

Use a flat screwdriver to hold the lever in place.

Tighten the screw that holds the axis of the lever using a Phillips screwdriver.

Step 12

              Carburetor reassembly
  • Reinstall the needle lever membrane and the membrane gasket
  • Reinstall the membrane cover.
  • Tighten the four cover fixing screws using a Phillips screwdriver in a clockwise direction.

Reinstall the needle lever membrane and the membrane gasket

Reinstall the membrane cover.

Tighten the four cover fixing screws using a Phillips screwdriver in a clockwise direction.

Step 13

              Carburetor reassembly
  • Reinsert the two adjustment screws.
  • Screw them in as far as they will go without forcing them clockwise with the adjustment screwdriver.
  • Pre-adjust the carburettor by unscrewing the two screws one and a half turns counter-clockwise

Reinsert the two adjustment screws.

Screw them in as far as they will go without forcing them clockwise with the adjustment screwdriver.

Pre-adjust the carburettor by unscrewing the two screws one and a half turns counter-clockwise

Step 14

              Carburetor reassembly
  • Take the pump cover.
  • Reposition the pump membrane and its seal.
  • Replace the pump cover and tighten the two fixing screws clockwise using a Phillips screwdriver.

Take the pump cover.

Reposition the pump membrane and its seal.

Replace the pump cover and tighten the two fixing screws clockwise using a Phillips screwdriver.

Step 15

              Carburetor reassembly
  • Reinstall the black fuel inlet hose.
  • Reinstall the transparent fuel return hose.
  • Reattach the throttle cable.

Reinstall the black fuel inlet hose.

Reinstall the transparent fuel return hose.

Reattach the throttle cable.

Step 16

              Carburetor reassembly
  • Insert the two fixing screws in the air filter housing and then in the carburetor body.
  • ATTENTION: Make sure that the fixing screws align with the holes of the gasket.
  • Tighten the fixing screws clockwise using the T25 Torx key.

Insert the two fixing screws in the air filter housing and then in the carburetor body.

ATTENTION: Make sure that the fixing screws align with the holes of the gasket.

Tighten the fixing screws clockwise using the T25 Torx key.

Step 17

              Refitting the air filter
  • Refit the air filter.
  • Reclips the filter cover.

Refit the air filter.

Reclips the filter cover.

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