ARC AC-MC104 Billet Nissin Clutch / Rear Brake Master Cylinder Cap
The ARC AC-MC104 is a billet master cylinder reservoir cap for select Honda, Kawasaki, Suzuki and Yamaha motorcycles equipped with compatible Nissin clutch or rear brake master cylinders. Depending on the application, it replaces the factory clutch or rear brake reservoir cap with a precision-machined ARC upgrade.
Machined from 6061 billet aluminum and available in multiple anodized colors, the AC-MC104 delivers a clean, factory-inspired look with a precise OEM-style fit.
IMPORTANT: The AC-MC104 is used in different positions depending on the application. Verify whether your motorcycle uses this cap on the clutch, rear brake or both before ordering.
✔️Chosen by factory riders
⚙️Precision crafted in California, USA
Fitment
Part# AC-MC104
HONDA
CRF250 RWE: 2025-2026 — Clutch
CRF450R / RWE: 2021-2026 — Clutch
CRF450R-S: 2022-2024 — Clutch
CRF450RX: 2021-2026 — Clutch
KAWASAKI
KX 125: 2000-2005 — Rear Brake
KLX 230 / R / RS / S / SE: 2020-2026 — Rear Brake
KX 250: 2000-2007 — Rear Brake
KX 250F: 2004-2018 — Rear Brake
KX 250: 2019-2020 — Rear Brake
KX 250 / X / XC: 2021-2026 — Clutch & Rear Brake
KLX 300R: 2020-2026 — Rear Brake
KLX 450R: 2008-2009 — Rear Brake
KX 450F: 2004-2018 — Rear Brake
KX 450 / X / XC / SR: 2019-2023 — Clutch & Rear Brake
KX 450 / X / SR: 2024-2026 — Clutch
SUZUKI
RM 125: 2006-2008 — Rear Brake
RM 250: 2006-2008 — Rear Brake
RM-Z 250: 2008-2025 — Rear Brake
RM-Z 450: 2008-2025 — Rear Brake
RMX-Z 450Z: 2017-2019 — Rear Brake
YAMAHA
YZ 250F: 2027 — Clutch
YZ 450F: 2026-2027 — ClutchDescription
- CNC-MACHINED 6061 BILLET ALUMINUM
- DIRECT OEM-STYLE REPLACEMENT
- DESIGNED FOR SELECT NISSIN CLUTCH AND REAR BRAKE MASTER CYLINDERS
- PRECISION-MACHINED FOR A FACTORY FIT
- DURABLE ANODIZED FINISH
- ARC LOGO
- MADE IN THE USA
