Zenoah K285041210 Piston Ring - G740BPU Engine Replacement  [K285041210]

G740BPU piston ring specification

The Zenoah piston ring K285041210 is a hardened steel replacement meant for G740BPU nitro RC engines. It is supplied for model engine rebuilds and tuning projects where replacement sealing parts are required.

Function: piston rings maintain compression, control blow-by, and affect engine performance during break-in and tuning cycles. Prior to replacing a ring check the piston and bore for scoring and set the end-gap to the correct tolerance.

Procedure notes: insert the ring into the piston groove with consistent pressure, confirm the correct face if marked, and stagger ring gaps when relevant. After rebuilding, follow standard break-in and tuning procedures to validate sealing and reliability.