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Description
FEATURES
- All piston skirts are coated with a hi-tech Molybdenum Disulphite coating for faster break-in time and increased piston life
- Cast Replica piston kits are gravity cast aluminum alloy (not forged) with 18% silicone content, which produces an extremely light but very strong piston
- Forged Replica pistons are forged from 2618 aluminum for superior strength and durability
- Forged High Compression pistons improve power and torque across entire rpm range
- Forged Big Bore pistons increase engine's displacement, torque, and peak horsepower
- Forged Replica pistons are forged OE replacements
- All pistons are heat treated with a T-5 hardening and tempering cycle
- Replica pistons and all rings are OEM replacements
- Kits include piston, rings, wrist pin and circlips
- Two stroke replacement rings are sold individually (Example if your piston has two rings you will want to order two rings)
- Four-stroke piston rings sold as a set
Technical Specifications
- MFG. Part Number 22915B
Vehicle Information
BETA RR 350 Dirt Bike (2011-2026)
The Beta RR 350, an enduro motorcycle produced from 2011 to 2026, is renowned for combining the agility of a 250cc with the power of a larger displacement engine. Throughout its production, the engine displacement has consistently remained around 349cc. This model has been offered in various trims, including the standard RR, the performance-oriented RR Race Edition, the street-legal RR-S, and the trail-focused RR X-Pro introduced in 2026. The RR 350 has undergone several significant updates across its model years. Key changes include the introduction of electronic fuel injection (EFI) in 2015, alongside a lighter, smaller engine and improved suspension. Earlier updates in 2012 refined the engine and chassis with a redesigned cylinder head and a new fork. Later, 2018 models featured lighter engines and revised aesthetics. In 2020, updates focused on CDI mapping, a new rear shock, and a larger fuel tank. For 2024, RR Race Edition models received a new, more rigid frame. The 2026 model year saw the debut of the RR X-Pro trim with a new frame and lower seat height, while RR Race models gained new engine maps. FAQ:
Q: Is this product compatible with my Beta RR 350?
A: To ensure perfect compatibility, please use the year and edition selector at the top of this page.
Maintenance
| Component | Interval | Details |
| Break-in Service | 3 hours | |
| Engine Oil and Oil Filter | 5 to 15 hours | Replace paper filter and clean wire netting oil filter. Shorter interval (5-10 hours) for aggressive/race-level riding, longer (10-15 hours) for recreational riding. |
| Air Filter | 5 to 20 hours | Inspect and clean. More frequently (5-10 hours) in dusty conditions or aggressive riding, otherwise 10-20 hours. |
| Spark Plug | Check/service at 30 hours, 60 hours, then every 60 hours | |
| Coolant | Check at each service; replace every 12 months or 60-90 hours | Check system tightness and level. |
| Drive Chain | Regularly | Clean, lubricate, and adjust tension. Replace when teeth are pointed. Timing chain should be checked for tensioner operation and link wear at major services (e.g., 90h, 120h). |
| Valve Inspections | 15 to 40 hours | Shorter interval (15-30 hours) for aggressive/race-level riding, longer (30-40 hours) for recreational riding. |
| Top-End Inspections (piston and cylinder) | 30 to 70 hours | Shorter interval (30-50 hours) for aggressive/race-level riding, longer (50-70 hours) for recreational riding. |
| Bottom-End Inspections (crankshaft and bearings) | 50 to 150 hours | Shorter interval (50-80 hours) for aggressive/race-level riding, longer (100-150 hours) for recreational riding. |