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FMF Racing


This is the most serious bolt-on performance mod that you can make to your Banshee! Designed and manufactured in the USA, the FMF Power Up kit consists of an entire cylinder, head with interchangeable domes, pistons, rings, gaskets, studs, intake manifolds, reeds, reed cages and new integrated power valve system that bolts onto the Yamaha 350 Banshee.

Power-valved Power Up Kit Dyno ChartPerformance gains are had via new larger Mono cylinder design for larger transfer volume, which aids in tremendous power gains everywhere! The larger 68mm bore gives increases displacement (making it a 400) for greater horsepower. Seven transfer ports are larger, aiding to port size, which increases intake volume to feed the larger bore. A larger reed cage area, which houses current YZ 250 reed cages eliminates intake restriction allowing for greater throttle response along with a broader power delivery. Too, there are additional intake boost ports for increases intake charging and therefore enhanced throttle response.

Banshee Power-valveSingle main exhaust port per cylinder with an auxiliary sub port, boosts the overall power output without sacrificing torque. With the addition of a variable exhaust port (Power Valve), the port height alters to increase low-end performance while allowing for greater exhaust port areas when the exhaust valve opens to boost mid to top-end power.

Forged ultra light flat top two ring pistons give stronger acceleration and greater top end power. The aluminum exhaust flanges are removable and hard anodized with an o-ring seal to reduce wear and cracking from the pipe flanges (common in the stock system). Heavy-duty 4130 Chrome-Moly cylinder head studs will eliminate stretching and the billet aluminum head comes with a set of pump gas compatible 10cc interchangeable domes, with the option to run 8.5 cc or 7.5cc domes to allow for compression changes and adjustments when switching fuels.

The Power Up Kit comes with the following parts:

  • Complete Cylinder
  • Reed Valves, carbon fiber reeds, intake gaskets, billet aluminum intake manifolds, stainless steel bolts & washers
  • Base Gasket and o-rings
  • 68mm ultra light forged flat top pistons with lightweight wrist pins, rings and clips
  • Billet aluminum head with one set of 10cc domes
  • Cylinder head studs and capped nuts with copper washers.
  • Hard anodized aluminum exhaust flanges with o-ring seals.
  • Complete Exhaust valve housing assemblies.

Price $1999.95 (price subject to change)

FMF Power Up Cylinders require the use of Keihin 35mm carburetors with EEK needles in the 2nd position, 142 main jets, and 42 pilot jets.  Aftermarket air filters will be required with the use of these carburetors.

Note: FMF will be offering a Honda FourTrax 250R Power Valve “Power Up Cylinder” after the first of the year.

For more information contact:

FMF Racing
18033 South Santa Fe Avenue
Rancho Dominguez, CA 90221-5514
Phone: 310.631.4363

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