O.S. Engine OS27902000 Crankshaft - Fits 61SX-H and 61RX-H  [OS27902000]

O.S. ENGINES CRANKSHAFT 61SX-H,61RX-H
Price:
NZD$39.40
Brand:
O.S. Engine
Model:
OS27902000
Condition:
Brand New
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Durable Crankshaft for 61SX-H and 61RX-H

O.S. Engine OS27902000 is a service replacement crankshaft designed for use in O.S. 61SX-H and 61RX-H nitro engines. It performs the fundamental role of converting piston stroke into rotational motion and is intended as a like-for-like swap for worn factory components.

Confirm your engine matches the listed model codes before purchase. Removal and refit require basic engine strip-down; carefully assess bearing surfaces and crankpin seating, fit the correct bearings, and set proper end-play and lateral alignment when reassembling. During a rebuild, also check the connecting rod and crankcase faces for signs of uneven wear.

Proper balance and minimal runout are important for tuning and engine longevity. After fitting, carry out a static balance inspection and an initial low-rev break-in while watching for vibration or oil seepage. Solid gasket sealing and a careful break-in routine help protect performance and reliability.

Technical Specifications

  • Item: Crankshaft
  • Material: Not specified
  • Model Number: OS27902000
  • Compatibility: 61SX-H, 61RX-H

Use this crankshaft to replace a damaged or worn unit in 61SX-H or 61RX-H engines, and follow routine rebuild checks for bearings, runout, and sealing to restore dependable operation.

How robust is this crankshaft for repeated rebuilds?

Provided as a replacement component, it will restore mechanical function, but always inspect mating surfaces and bearings for root causes of failure to avoid repeat problems.

Does the crankshaft arrive balanced?

Balance may vary by production run; perform a static balance check on arrival and correct if needed before break-in to minimise vibration.

Should I replace bearings when installing this crank?

If bearings show wear or uncertain service history, replace them. The product details do not list included bearings, so plan accordingly.

What break-in procedure is recommended after fitting?

Run a controlled low-speed break-in, monitor for unusual noise or leaks, and confirm gasket sealing. Avoid heavy loads during initial runs to protect the new crank.

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