The rotor guide washer is an accessory for R/C-scale engines that serves as a precision spacer in rotor assemblies. It helps maintain correct rotor positioning during disassembly and rebuild, aiding consistent alignment while servicing or tuning nitro-style engines.
Hobbyists and workshop techs place the washer between rotor components to control end-play and keep the rotating elements concentric. That steadiness reduces iterative adjustments when setting ignition timing or balancing the rotor after changes.
Installation notes: remove the engine head or rotor housing following your engine's service instructions, slide the washer into the rotor stack where needed, and verify clearances against the engine's service limits. Only use thread-lock or apply torque where the manual calls for it; the washer is a passive spacer and does not take the place of bearings or seals.
Tuning notes: after adjusting carburetion, timing, or performing port work, always re-check rotor alignment. Minor differences in stack height can affect balance and running smoothness, so include the washer in your measurement checks rather than expecting it to alter performance directly.
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