All Balls Rear Shock Seal Head Kit
1004-3001 (MFG #: 37-1125)
$86.91
Sale price
$86.91
Regular price
$86.91
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All Balls Rear Shock Seal Head Kit for Yamaha YZ490 Dirt Bike
All Balls Rear Shock Seal Head Kit for Yamaha YZ490 Dirt Bike
$86.91
Sale price
$86.91
Regular price
$86.91
SKU:1004-3001
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Description
FEATURES
- Complete assemblies, ready to install into the shock body
- Made from 6061-T6 aluminum and the same custom elastomer as our fork seals
- All have air bleed holes to help remove air from the oil reservoir during installation
- Double-lip oil seal designed to keep out dirt and keeps friction low
- Some models have updated designs for easier installation
- Includes aluminum body, dust seal, bushing, oil seal, O-ring, internal guide bushing/washer, snap ring and top out bumper
- Made in the U.S.A.
Technical Specifications
- MFG. Part Number 37-1125
Vehicle Information
Yamaha YZ490 Dirt Bike (1982-1990)
The Yamaha YZ490, produced from 1982 to 1990, was an air-cooled, two-stroke motocross motorcycle known for its powerful engine. It maintained a consistent engine displacement of 490cc (often specified as 487cc or 488cc) throughout its production, with horsepower figures varying slightly from approximately 55 to 60 HP. While it did not feature distinct trim levels in the modern sense, the YZ490 received numerous significant updates throughout its production run. Major changes were made to the engine, chassis, and suspension. Notable improvements included the introduction of a front disc brake in 1985, the crucial addition of a five-speed transmission in 1986, and continuous enhancements to the forks and rear suspension system to refine its performance. Q: Is this part compatible with my Yamaha YZ490?
A: To ensure perfect compatibility, please use the year and model selector at the top of this page to find parts specific to your vehicle.
Maintenance
| Component | Interval | Details |
| Engine Oil Change | Every 5 to 10 hours | Varies by year and riding type. For example, 10 hours for recreational riding and 5 hours for aggressive riding (1982, 1983, 1990 models). |
| Air Filter Service | Every 2 to 15 hours | Varies by year and riding type. For example, 15 hours for recreational riding (1982) or 2 hours for aggressive riding (1990). |
| Spark Plug | Check at 30 hours | Manuals do not detail a specific replacement interval. It is advised to check the spark plug at 30 hours or replace it if issues arise. |
| Oil Filter | Not applicable | Two-stroke engines typically do not have a separate engine oil filter. |
| Belt | Not applicable | The Yamaha YZ490 is chain-driven and does not use a belt. |
| Coolant | Not applicable | The engine is air-cooled and does not use liquid coolant. |
| Valve Inspections | Every 15 to 30 hours (1982 model) | 15 hours for aggressive riding, 30 hours for recreational riding. |
| Top-End Inspections | Every 20 to 50 hours | Varies by year and riding type. For example, 20 hours for aggressive riding (1983) or 50 hours for recreational riding (1982, 1990). |
| Bottom-End Inspections | Every 50 to 100 hours | 50 hours for aggressive riding, 100 hours for recreational riding (1982, 1990 models). |
Maintenance intervals can vary significantly based on the model year and riding conditions (recreational vs. aggressive). It is highly recommended to consult the owner's manual specific to your model year for accurate information.