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Description
The redesigned PowerBomb is a four-stroke header that incorporates FMF’s patented PowerBomb module at a precise location in the initial stage of the header. By positioning this “Bomb” at a key point in the system, increased performance and flow is achieved through the expansion and contraction of exhaust sonics through the system. Result is a flow increase of nearly 10%! The outer chamber in the Powerbomb allows the air to expand, cool and ramp back up at a higher velocity. Additionally, the PowerBomb is a “pre-muffler” of sorts which helps to lower the bikes sound output by providing more sound absorbing surface area for the sound medium (exhaust gases). On some models, you can choose between a moto or supercross version. The supercross version is designed for more low to mid-range power where the moto version is focused in the mid to upper RPM range.
FEATURES
- Position "Bomb" increases performance; horsepower is increased as much as 10%
- Act as a "pre-muffler" helping to lower the decibel output
- the expansion and contraction of exhaust sonics through the system causes increased flow
- A perfect fit with any FMF muffler
- Quality construction for maximum durability
Technical Specifications
- MFG. Part Number 041583
Vehicle Information
Yamaha YFZ450 ATV (2004-2026)
The Yamaha YFZ450 has been a prominent sport ATV from 2004 to 2026. It features a consistent 449cc, liquid-cooled, DOHC, 4-stroke engine with 5 titanium valves, delivering robust performance throughout its production run. A significant evolution occurred around 2009. Early YFZ450 models (2004-2008) were carbureted (Keihin) with an 11.4:1 compression ratio and a lightweight steel frame. From 2009 onwards, the YFZ450R introduced electronic fuel injection (YFI) and an 11.8:1 compression ratio, alongside a redesigned cast aluminum/steel hybrid chassis and an assist and slipper clutch. Special Edition (SE) trims have been available across all years, often featuring unique aesthetics. Q: Is this product compatible with my YFZ450? R: To ensure compatibility, please use our year and edition selector on this page.
Maintenance
| Component | Interval | Details |
| Engine Oil and Oil Filter | Check before each ride. Replace every 15-20 hours or annually (normal conditions), or every 6 months (non-race), or every 5 hours (race). | |
| Air Filter | Clean every 20-40 hours. | More frequently in dusty or wet conditions. Every 2-5 hours for race use. |
| Spark Plug | Check and clean every 3 months. | Replace if necessary. |
| Coolant | Check monthly. Replace every 24 months. | |
| Drive Chain | Clean, adjust, and lubricate every 3 months. | More frequently in wet, muddy, or dusty conditions. |