Hot Rods Countershaft Seal Kit OSK0040 (421-5040) | YZ450F/WR450F/YZ450FX/YFZ450
Hot Rods Countershaft Seal Kit — Yamaha YZ/WR/YFZ 450 (2003–2021) — OSK0040 (421-5040)
Stop sprocket-side leaks fast with this complete countershaft seal kit from Hot Rods. Purpose-built as a quick, reliable fix, it includes the correct countershaft seal, bushing, O-rings, and sprocket nut washer (where applicable) to restore a tight, dry output shaft. Meets or exceeds OEM specs for long service life.
What’s Included
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Countershaft seal
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Countershaft bushing
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O-rings
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Sprocket nut washer (where applicable)
Notes
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Does not include water pump bearing or transmission bearings.
Fitment / Compatibility
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YFZ450: 2004–2009 (incl. SE/Bill Balance where applicable)
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YZ450F: 2003–2021
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WR450F: 2004–2021
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YZ450FX: 2016–2021
Part Details
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Part / Brand Number: OSK0040 (421-5040)
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Weight: 0.15 lbs
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Package: 4.90 × 3.90 × 1.20 in
📦 Shipping Information
In-Stock Items:
- Most parts ship next business day
- Modquad parts: Monday–Thursday dispatch
Made-to-Order Items:
- Custom swingarms & A-arms: 2–4 weeks
- EVP exhaust systems: 2–4 weeks
- Sneakers: 1–2 weeks
Stock Guarantee: Items marked "In Stock" ship immediately. Made-to-order items are built fresh for you.
Questions? Contact us—we respond within 24 hours.
