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Bertil AlbingBertil AlbingServicing Emission Regulated CarburetorsServicing Emission Regulated Carburetors

Service Carburetors “D” Type Mixture Screws

• TSB-278

Carburetor Disassembly & Assembly

1. Remove the carburetor.

2. Remove the “D” type mixture screws. – Count the number of turns – Record the setting. – Remove the “D” Mixture screws.

3. Disassemble, Clean, Inspect and Reassemble.– Reset each mixture screw to its original position.

TSB-278Chart 2

Idle Speed and Low Speed Mixture Adjustment.

1. Adjust the idle speed below clutch engagement speed

2. Rotate the L mixture screw to find peak rpm between rich and lean.

3. Adjust the idle speed

4. Repeat step 2 and 3 as needed

5. Adjust the idle speed screw to “Max idle rpm”

6. Adjust the Idle rpm to "Rich Down rpm”

High Speed Mixture Adjustment

• NOTE: Do not run engine at WOT without load longer than 10 seconds.

1. Run the engine at WOT and rotate the H-mixture screw until the rpm reaches the specified “Starting rpm”.

2. Run the engine at WOT and rotate the H-mixture screw counterclockwise until the rpm reaches the specified “Rich Down” rpm.

Engines with rpm limiters

• Set the WOT engine rpm to just before engine speed limiter engagement.

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