When with a 15,000+ rpm redline, intake tract length increases in importance.
Factory Pro helps you make power where you want it.

 YZF600 R6
 Hi Flow Velocity

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  Improve PEAK POWER  
  more quickly and easily than any engine or carb mod.

These stacks drop on and, because of the improved velocity, richen the main circuit slightly - about 1-2mj's.  30mm/25mm combination stacks improve power at 12k and up. We found no decrease low-end and midrange when properly tuned on a 4 Gas  EC997 Low Inertia Eddy Current Dyno.

Excellent power improvement for very little work.
These US made v-stacks equal power improvement that equals and exceeds Yamaha Race Kit versions and have been tested to optimize lengths for use with stock and US "Supersport" types of engines.

Designed by Factory Pro. Specially manufactured, featuring a larger, more efficient "flare" for increased air flow.
Manufactured from aluminum alloy, these are 1 piece units that drop on and simply make more power.
Use the 30mm/25mm combination set - for 13k+ rpm

Take the airbox top off and drop them on, replace the airbox top and fuel tank and GO! (They really are better! Marc)
1-3hp in 15 minutes.

Measurements from bellmouth of carb to ~4mm deeper than the velocity stack screw boss surface.

Excellent for street and race classes that allow carb mods.
Add the 1.7-RK RaceKit for the biggest improvement.


  (boosts power 1-3 hp at  


 (set of 4)

Tuner's Kit

3 sizes, 12 pieces total

pn: RA-VEL-Y78-TK

Available in: 20, 25, 30, 35, 40 and 45mm lengths

Click here to go back to R6 page




Absolutely NO carb parts sold in California.

New and improved
Suzuki Teka SFI 2
with new TPS display and "MMT" Memory Module Tuner feature

Finally - Quick, easy, cost effective Suzuki tuning with no expensive "add-on boxes"
Suzuki cruisers and sportbikes

Please click here for more info

Contact Factory Pro
M-F, 9am - 5pm, Pacific time, -7 or -8 GMT

800 869-0497
 USA and Canada

415 883-5620

no fax

Factory Pro
101c Roblar Drive
Novato, CA

If it's
4pm at Factory Pro it's 9am in eastern Australia.

parts information

EC997 dynamometer information

Product Support /Tech SECTION
click here

And most importantly
Restart back at the HOME page and click on the red box in the top left to find the bike that you want parts for...

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It doesn't matter what you ride or race, the Rich Oliver Mystery School improves everyone's skill level and mindset!

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The extension of the laboratory for engines of the Swiss Federal Institute of Technology was completed in about 1935. Its architect was Rudolf Otto Salvisberg (1882-1940). He had a successful career in Berlin but returned to Switzerland after the advent of the Nazis. His architectural style was somewhat similar to that of Erich Mendelsohn. The staircase of the laboratory is in normal use but well preserved.
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Marin French Cheese Co., also known as The Cheese Factory and Rouge et Noir is not just the oldest cheese manufacturer in the country, but a vacationers and day trippers destination as well as a unique part of American History. Located north of San Francisco, east of Napa County, west of Pt. Reyes and Olema and south of Sonoma County, Marin French has produced hand crafted Artisan soft ripened cheese since 1865. Rouge et Noir cheeses are similar to French and European varieties but reflect the characteristics of Northern California, producing it's own regional style.