The 40 mm Preload Steering Stem Wrench Spanner (Factory Links SWN-Z-002) is a workshop tool for setting steering stem preload accurately, enabling controlled adjustment of steering column preload nuts without damaging the nut or surrounding components.Features Adjusts steering stem preload accurately without hammers or guesswork Secure engagement designed to avoid damage to preload nuts and surrounding hardware Provides controlled adjustment for steering setup, maintenance, suspension tuning, and race-day changes Suitable for repeated workshop use Part of a multi-size range for Japanese motorcycles Specifications 40 mm size Stamped steel construction Vehicle Fitments Fantic XE 125 (2021-2026) Fantic XE 300 (2025-2026) Fantic XEF 250 (2021-2026) Fantic XEF 250 Trail (2022-2024) Fantic XEF 310 (2024-2026) Fantic XEF 450 (2022-2026) Fantic XEF 450 Rally (2022-2025) Fantic XEF 450 Rally Factory (2022-2024) Fantic XX 125 (2021-2026) Fantic XX 250 (2022-2026) Fantic XXF 250 (2022-2026) Fantic XXF 450 (2022-2026) Yamaha WR 250 (1992-1997) Yamaha WR 250 F (2015-2026) Yamaha WR 250 R (2001-2020) Yamaha WR 400 F (1998-2000) Yamaha WR 426 F (2001-2002) Yamaha WR 450 F (2003-2026) Yamaha WR 500 Z (1992-1993) Yamaha YZ 125 (1987-2026) Yamaha YZ 125 X (2021-2026) Yamaha YZ 250 (1988-1995) Yamaha YZ 250 (1988-2026) Yamaha YZ 250 F (2001-2026) Yamaha YZ 250 FX (2015-2026) Yamaha YZ 250 X (2016-2026) Yamaha YZ 400 F (1998-1999) Yamaha YZ 426 F (2000-2002) Yamaha YZ 450 F (2003-2026) Yamaha YZ 450 FX (2016-2026)