FSa-155 Piston OS42503200 for O.S. Engine Cylinder Assemblies Replacement  [OS42503200]

O.S. ENGINES PISTON FSa-155
Price:
NZD$45.40
Brand:
O.S. Engine
Model:
OS42503200
GTIN:
4531028148062
Condition:
Brand New
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Maintenance purpose and component role

The O.S. Engine PISTON FSa-155 functions as an aftermarket replacement sized to fit matching model engine cylinder assemblies. The description highlights practical fitment, installation considerations, and the piston’s influence on engine behaviour without asserting additional performance figures.

Use the piston during routine engine service or when rebuilding an engine that shows wear, scoring, or weak ring seals. During replacement in a glow/nitro RC engine, examine the cylinder wall, confirm correct ring seating, and verify piston orientation and endplay per your engine's service instructions. Do not fit this component to non-RC or full-size engines.

Installation reminders: perform work in a clean environment, use light assembly lube as advised by the engine documentation, and turn the crankshaft by hand to confirm unobstructed piston travel before completing reassembly. For required clearances or ring gaps, rely on the manufacturer documentation.

Specifications

  • Item: PISTON FSa-155
  • Model Number: OS42503200
  • Material: Not specified by manufacturer
  • Compatibility: Refer to O.S. Engine fitment guidance for matching cylinder assemblies

The piston is supplied as a serviceable replacement for compatible O.S. engine cylinder assemblies and must be installed following the engine maker’s maintenance procedures to ensure correct sealing and reliable operation.

Is the piston sold individually or as part of a kit?

Check the retailer listing for quantity details; product pages generally specify whether the piston is supplied as a single unit or packaged with other parts.

How can I confirm it fits my cylinder assembly?

Remove the head and sleeve to visually inspect skirt clearance and ring seating, then slowly rotate the crank to ensure free movement and absence of binding. Refer to O.S. Engine fitment notes where applicable.

Will swapping to this piston change engine output?

A correct replacement can restore proper sealing and steadiness, but any change in output depends on the whole engine condition and how accurately the piston is installed.

Are special measuring tools needed for setting clearances?

Basic workshop measuring tools are usually sufficient; follow the engine maker’s service manual for any specific measurement procedures or torque settings.

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