Precision Throttle Stop Screw for 20D 20F 2FB Carburettors - OS22681320 by O.S. Engine  [OS22681320]

O.S. ENGINES THROTTLE STOP SCREW 20D,20F,2FB
Price:
£3.04
Brand:
O.S. Engine
Model:
OS22681320
GTIN:
4531028105508
Condition:
Brand New
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Purpose and application

This throttle stop screw is a replacement component made for carburettors identified as 20D, 20F and 2FB on O.S. Engine units. It establishes the closed-throttle position to produce a consistent idle and to help maintain stable settings when adjusting the needles.

The part fits into the original carburettor stop location, pressing against the throttle stop tab or cam surface. Typical fitting involves removing the old stop, seating the new screw, and then adjusting idle with precision while the engine is running to reach the desired idle speed.

When tuning, work in small increments, check throttle return through full travel, and confirm that idle remains steady after each tweak. Keep the area clean of fuel deposits and inspect the screw threads to ensure dependable, repeatable adjustments.

Does this screw fit original O.S. 20D, 20F and 2FB carburettors?

Yes. The item is listed with the 20D, 20F and 2FB model designations, indicating it is intended for those carburettor types.

Will fitting the new screw affect my needle settings?

Changing the stop screw can alter idle position, so set a neutral baseline before running the engine and then adjust carefully to avoid upsetting the main and idle needle balance.

How should I inspect the screw and carburettor after installation?

After fitting, verify thread integrity and that the throttle linkage clears stops, and clean any fuel residue to ensure consistent operation.

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