145cc Takegawa S+R 4V bore up kit Honda MSX JC92-Monkey JB03 - CT125cc JA65

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  145cc Takegawa S+R 4V bore up kit Honda MSX JC92-Monkey JB03 - CT125cc JA65

  S+R 4V 145cc Takegawa Kit for Honda MSX JC92 - Monkey JB03 - CT125cc JA65

  High-tech now a classic from Takegawa:

  • Bore diameter: 54 mm

  • Stroke: 63.1 mm (standard)

  • Compression ratio: 12.0:1

  • Roller aluminum rocker arms:

    • Intake valves: 21.5 mm × 2
    • Exhaust valves: 18.5 mm × 2
    • Valve stem diameter: 4.0 mm

  • Uneven pitch valve springs (dual pitch) are used to reduce the risk of surging at high RPMs.

  • An M8 spark plug is used to match the optimal valve angle and compact design of the 4-valve SOHC cylinder head.

  • Automatic decompression camshaft (10/10D):
    Ensures smooth starting, even with larger engine displacements, and reduces the load on the kickstart and transmission system.

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  Important Notes

  Injection controller required:
  When installing the Super Head 4V+R kit, it is necessary to use the FI Con TYPE-X injection controller for optimal engine management.

  Recommendation for crankshaft support:
  Takegawa recommends installing a crankshaft support adapter to enhance durability. This adapter adds a ball bearing support to the flywheel side of the crankshaft, reducing stress and increasing strength.

  References for crankshaft support adapters:

  • CT125 (JA65): 01-10-0150
  • Monkey 125 (JB03): 01-10-0150
  • GROM (JC92): 01-10-0149

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  Not Road Legal

  Since the displacement exceeds 125cc, this kit is not approved for use on public roads with standard registration. It is intended for competitive use only.

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