Made in USA Race Kit includes Intake, Twin Air Filter & Wash Cap.
Take this seriously, because sealing your engine comes first. We designed this system to lock out dirt from your intake tract by identifying several issues with the OEM filter receiver. It's guaranteed to save you hundreds if not thousands in engine repairs.
Motocross Action's Wrecking Crew gave this intake a 5 Star Review. Transworld Motocross a 10 out of 10.
Applications: Yamaha YZ 125-450 Intake Carburetor. This kit does not apply to fuel injected YZ's.
Same kit and filter for both 2 Stroke and 4 Stroke Applications
2 Strokes: Much improved low end power that continues throughout red line. Bike starts easier, runs cooler and throttle response is improved.
4 Strokes: 1.5 horsepower on a YZ250F (Tested at Factory Yamaha/GYTR) and up to 5 horsepower in the mid-range on our 2008 YZ450F. Bike starts much easier, runs cooler and throttle response is improved.
Installation takes only a few minutes as it replaces the OEM filter receiver. No modifications necessary. Jetting typically not required. We install at the races without having to make adjustments.
MXA PRODUCT TEST: Loud Mouth High Performance Intake System
WHAT STANDS OUT? Here’s a list of things that stand out with the Loudmouth quick change air filter system.
(1) Performance. Although designed for ease of use, the Loudmouth’s airy design does have performance benefits. The wide open intake opening allows for a larger volume of air to flow into the engine, and with no cage, wire screen or cage mounting bracket, the air is unrestricted into the carb throat. On the dyno the Loudmouth actually showed a horsepower increase, across most rpm settings. On the track, test riders felt the power increase as more transitional power across the midrange. We didn’t have to re-jet.
(2) Installation. MXA tested the Loudmouth on a 2009 Yamaha YZ450F, and thanks to the simplicity of Yamaha’s airbox design, it could be installed in less than ten minutes. It takes longer on a Kawasaki, Honda or Suzuki because their airbox rings bolt on. It is necessary to seal the plate with Hondabond or Yamabond.
(3) Air Filter. Every Loudmouth system uses the same air filter whether on a CRF, RM-Z, KX-F or YZ-F. It uses a rubber lip-style filter (called a green weenie decades ago). It is easy to change and the extended lip of the Loudmouth ring makes it impossible for dirt to fall into the carb. Best of all, you don’t have to fish around with the wing nut bolt to get the filter installed.
WHAT’S THE SQUAWK? No complaints. We’d run the Loudmouth just because it makes cleaning the filter easier. The improved powerband is a bonus.