O.S. Engine OS29083200 Carburetor Rotor for 60L and 91SX-H  [OS29083200]

Replacement Rotor for 60L and 91SX-H Carbs

This rotor is an RC-scale carburetor replacement component identified by the product number OS29083200. It is designed for carburetor assemblies that reference the 60L and 91SX-H codes shown in the model name. The notes below cover compatibility checks, basic installation steps, and how the rotor affects throttle response during tuning.

Compatibility and fit

• The part name specifies 60L and 91SX-H, so use it where those codes match the carburetor body or service part list.
• Verify the rotor shape and indexing when fitting, as accurate alignment with the carburetor sleeve is required for predictable throttle control.

Installation overview

• Remove the carburetor from the engine and drain fuel before disassembly.
• Disassemble the carburetor cover and concentric parts to access the rotor, noting orientation marks for reassembly.
• Install the rotor in the correct orientation, ensure smooth rotation of the throttle sleeve, and reassemble using original fasteners and gaskets.
• Confirm there is no binding and check idle and full-throttle positions on a bench test before reinstalling on the model.

Tuning role and checks

• The rotor profile directly influences throttle progression and idle stability by changing how the sleeve opens relative to needle settings.
• After installation, retune the low and high speed needles incrementally and run short tests to confirm desired throttle response.
• Inspect for wear and replace the rotor if scoring or deformation is present, as those conditions affect seal and response.