Piston Ring Kit For Yamaha YFB 250 And YFM 250 ATV STD Bore 1989 2009 Fits Yamaha ATV Engines
Piston Ring Kit For Yamaha YFB 250 And YFM 250 ATV STD Bore 1989 2009 Fits Yamaha ATV Engines is backordered and will ship as soon as it is back in stock.
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Piston Ring Kit For Yamaha YFB 250 And YFM 250 ATV STD Bore 1989 20...
This piston ring kit is a precise standard-bore replacement designed for Yamaha YFB250 Timberwolf and YFM250 Wolverine ATVs, covering model years from 1989 through 2009. It’s engineered to restore compression, reduce oil consumption, and revive throttle response, delivering smoother operation in trail rides or farm work. With this kit, you can restore engine seal and power without the cost of OEM parts, making it a reliable choice for both DIY enthusiasts and professional mechanics.
Built to endure off-road use, the kit features materials and tolerances chosen for durability under heat cycling and abrasion. The chrome-plated top rings resist heat and wear, helping to minimize blow-by and maintain consistent compression. This aftermarket replacement is designed to drop back into the engine with a true-fit feel, providing long-term reliability for rugged terrain and high-RPM conditions.
Comprehensive Vehicle Fitment
| Manufacturer | Models / Series | Years / Details |
|---|---|---|
| Yamaha | YFB250 Timberwolf | 1992-2000 (Timberwolf, standard models) |
| Yamaha | YFB250 Timberwolf | 1992-2000 (4x4 variants with enhanced terrain handling) |
| Yamaha | YFB250U Timberwolf | 1992-2000 (utility-focused models for farm/work use) |
| Yamaha | YFM250 Moto-4 | 1989-1991 (entry-level sport models) |
| Yamaha | YFM250B Big Bear | 2005-2009 (larger utility with improved towing) |
| Yamaha | YFM250X Wolverine | 1999-2004 (recreation-focused with agile handling) |
Product Specifications
| Attribute | Details |
|---|---|
| OEM Reference Part Numbers | 4BD-11610-00-00 |
| Type | Piston Ring Kit for standard bore engines |
| Manufacturer | Aftermarket Replacement |
| Application | Yamaha YFB250 and YFM250 ATV engines (74mm standard bore, single-cylinder configuration) |
| Material | High-carbon steel with chrome-plated top rings |
| Dimensions | Bore size: 74mm; Compression ring thickness: 1.5mm; Oil ring thickness: 2.0mm; Overall set height: 2.5mm |
| Bore Size Compatibility | Standard 74mm bore; designed for engines without overbore modifications |
| Additional Technical Attribute | Tension rating: 15-20 psi for sealing under high RPM |
OEM & Aftermarket Cross-Reference Information
| Part Number | Brand / Type | Cross-Reference Notes |
|---|---|---|
| 4BD-11610-00-00 | Aftermarket Replacement | OEM Yamaha reference; equivalent aftermarket 74mm standard-bore piston ring kit compatible with Yamaha YFB/YFM250 engines |
What's Included
The kit includes the essential rings required for one standard-bore Yamaha 250 engine piston:
- Top Compression Ring
- Second Compression Ring
- Oil Ring Assembly
Note: Piston itself, circlips, and other related components are not included.
Why Choose This Aftermarket Replacement?
- Direct-Fit Compatibility: Engine-specific 74mm standard-bore configuration for Yamaha YFB/YFM250 models.
- OEM Cross-Reference: Clear reference to Yamaha OEM part 4BD-11610-00-00 with reliable aftermarket parity.
- Premium Materials: High-carbon steel with chrome-plated top rings for improved wear resistance and heat tolerance.
- Performance Restoration: Restores compression, reduces blow-by, and improves acceleration and fuel economy.
- Reliability in Off-Road Conditions: Built to withstand rugged terrain, high RPMs, and dust exposure typical of trail and farm use.
- Cost-Effective Maintenance: A durable aftermarket option that delivers OEM-like performance without the OEM price tag.
Installation Notes:
- Verify bore size with precise measurement; this kit is for 74mm standard bore, no overbore modifications.
- Clean the cylinder, ring grooves, and piston surfaces thoroughly before installation.
- Lightly coat all rings with clean engine oil before seating to prevent dry friction on initial startup.
- Install the top compression ring with the correct orientation as indicated by any stamping or bevel on the ring face.
- Stagger ring end gaps to avoid a continuous gap line across the piston sweep for optimal sealing.
- Follow a proper piston-ring seating break-in procedure as recommended by the engine manual to ensure long-term sealing.
Why Upgrade?
Worn piston rings allow blow-by, increase oil consumption, and reduce compression, which lowers power and causes rough idling. Upgrading to this standard-bore kit restores compression and reliability, delivering smoother starts, better throttle response, and consistent power output in demanding off-road or farm conditions.
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