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Start ShoppingAthena Top End Gasket Kit for Yamaha 250F - 83mm Bore Size - High-Performance Cylinder Gasket Kit
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Description
Upgrade your Yamaha 250F's engine performance with this specialized top end gasket kit. Engineered for durability and precision, this kit ensures reliable sealing and optimal compression during critical top end rebuilds.
Key Features
- Premium Material Construction: Heat-resistant materials withstand extreme engine temperatures for long-lasting performance.
- Perfect Fit for Yamaha 250F: Precision-machined for 83mm bore size, ensuring flawless compatibility with original equipment specifications.
- Easy Installation Design: Streamlined components reduce assembly time while maintaining sealing integrity during rebuilds.
Why Choose This Product
Engineers at Athena designed this gasket kit to deliver superior sealing performance for high-output engines. The 83mm bore size compatibility ensures proper compression and prevents oil leaks, while durable materials resist degradation from heat and pressure. Ideal for riders seeking reliable engine performance without compromising on quality or ease of installation.
SKU:
GM9BEE1385
MPN:
P400485160007
UPC:
8050444899274
Category:
Gaskets/Seals
Brand:
Athena
Stock:
Only 2 left!
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Upgrade your Yamaha 250F's engine performance with this specialized top end gasket kit. Engineered for durability and precision, this kit ensures reliable sealing and optimal compression during critical top end rebuilds.
Key Features
- Premium Material Construction: Heat-resistant materials withstand extreme engine temperatures for long-lasting performance.
- Perfect Fit for Yamaha 250F: Precision-machined for 83mm bore size, ensuring flawless compatibility with original equipment specifications.
- Easy Installation Design: Streamlined components reduce assembly time while maintaining sealing integrity during rebuilds.
Why Choose This Product
Engineers at Athena designed this gasket kit to deliver superior sealing performance for high-output engines. The 83mm bore size compatibility ensures proper compression and prevents oil leaks, while durable materials resist degradation from heat and pressure. Ideal for riders seeking reliable engine performance without compromising on quality or ease of installation.| SKU | GM9BEE1385 |
|---|---|
| MPN | P400485160007 |
| UPC/GTIN | 8050444899274 |
| Brand | Athena |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Yamaha | YZ250F | All Years |
| Yamaha | WR250F | All Years |
Frequently Asked Questions
The part is listed specifically as a “Gasket Set 83Mm YZ250F.”[2] You must still confirm exact year and bore with a fitment chart or OEM/Athena catalog before purchase.
One reseller titles it as a “Top End Gasket Kit For Yamaha WR250F YZ250F Dirt Bikes,” indicating coverage for both models.[4] Verify your exact year and piston/bore size against the Athena catalog.
No. Listings describe it as a top end or cylinder gasket kit, intended for the cylinder/head area only, not a full engine gasket set.[3][4]
Resellers describe it as a cylinder gasket kit/top end kit,[3][4] which normally includes the head gasket, base gasket and related top‑end seals. Check the specific contents on the retailer’s product page or Athena documentation.
No. It is an Athena aftermarket gasket kit (part number P400485160007), marketed as a replacement for the OEM top‑end gaskets.
Installation Guide
Difficulty
Medium
Est. Time
1 hr 30 min
Tools Required
- metric socket set
- torque wrench
- ratchet and extensions
- Allen/hex keys (metric)
- plastic scraper or razor blade for gasket surfaces
- brake cleaner or contact cleaner
- shop rags
- service manual for torque specs and sequence
Pro Tips
- Lay out all old gaskets as you remove them and match each one to the new Athena pieces before final assembly
- Use a plastic scraper and solvent to clean gasket surfaces; avoid aggressive abrasives that can gouge aluminum
- Lightly oil O‑rings and dowels so they seat properly without pinching
- Double‑check cam timing and rotate the engine by hand several revolutions before first start after reassembly
- Follow the OEM service manual torque specs and pattern exactly, especially for the cylinder head and cam caps
Common Mistakes to Avoid
- Re‑using old head or base gaskets instead of replacing all included gaskets
- Not cleaning cylinder head and cylinder mating surfaces completely before installing new gaskets
- Incorrect head bolt torque or torque sequence, leading to leaks or warping
- Installing gaskets backwards or misaligning oil/coolant passages
- Skipping re‑torque/check of fasteners after initial heat cycle when recommended by the service manual
Comparison vs Stock/OEM
Athena P400485160007 is an aftermarket replacement for the OEM Yamaha top‑end gasket set, designed to meet or exceed OEM sealing performance for the cylinder and head area.
Improvements
- Cost‑effective alternative to OEM gasket kits from Yamaha dealers
- Readily available as a dedicated 83 mm YZ250F/WR250F top‑end kit from multiple resellers[2][3][4]
Considerations
- Always compare thickness and design of critical gaskets (especially head and base) with OEM parts when building race engines or setting squish/compression
- Use in conjunction with OEM‑recommended torque specs and procedures to achieve OEM‑level reliability
Durability & Warranty
Expected Lifespan
Intended to last for the normal service interval of a correctly assembled Yamaha 250F top end when installed according to OEM procedures.
Maintenance
Periodically inspect for signs of oil or coolant leaks around the head and base; address any overheating or detonation issues promptly to protect gasket integrity.
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