Stock STX 12F Avg. Speed 55-56 mph @ 7100 RPM

Description of Parts RPM Top Speed
R&D STX 12F Ride Plate
Part #: 121-15100
7100 57.5-58 mph
R&D STX 12F Aquavein Scoop Grate
Part #: 111-15001
7100 58 mph
R&D STX 12F Power Plenum Air Filter Kit
Part #: 215-15010
7200-7250 58.5-59 mph
R&D STX 12F Sponson Kit
Part #: 121-15001
7200-7250 59 mph
R&D/Solas 12/18 Concord Impeller
Part #: 131-01218
7150-7200 59.5-60 mph



Parts/Kit Overview

The R&D Kawasaki STX 12F Performer Kit was developed to improve top speed performance and overall handling by delivering a much faster, more comfortable and stable ride. The R&D 12F Ride Plate Kit along with the new R&D 12F Aquavein Intake Grate, and adjustable Pro Series Sponson Kit, will deliver a higher degree of recreational performance with improved rear end traction and improved straight line top speed and stability. The R&D Aquavein will improve pump hook up in rough water conditions! The Solas 12/18 Concord Impeller will reduce cavitation and increase top speed performance. The R&D 12F Performer Kit has been extensively tested recreationally and in offshore racing conditions for bulletproof problem free performance! In offshore racing events the 12F Performer Kit has been a proven winner in stock class competition! R & D Performer Kits were developed to install easily, maintain a very high level of reliability, and run on 92-Octane pump gasoline!

  • The R & D STX 12F Ride Plate design has been used by Factory Kawasaki in pro runabout racing to win every National and World title for the past four years! In fact, the R&D 12F Ride Plate was used to win the 2004 World Championships on a supercharged Kawasaki 15F! Improved top speed performance, increased rear end traction, and great recreational handling prformance! For O.E.M. reverse gate use, install the R&D Reverse Gate Bracket Kit part # 121-15100.

  • The new R&D STX 12F Aquavein Intake Grate will reduce cavitation while increasing overall handling, straight-line stability and top speed performance. The R&D Aquavein Grate will keep the 15Fs pump loaded and hooked up, increasing rough water top speed averages 2-3 mph!

  • The R & D STX 12F Power Plenum Filter Kit will add a noticeable increase in low and mid range power, as well as improved top speed performance by adding 100 plus to the engines peak RPMs. The all aluminum precision CNC machined construction, rubber mounted system will add a high performance look to your engine compartment! The R&D Power Plenum sounds great, installs easily, and it delivers maintenance free performance!

  • The R & D Sponson Kit will substantially increase cornering capabilities by keeping the rear end of the 12F from sliding through tight turns. Straight-line stability at high speeds is also increased! Three position adjustability ensures a setting for any water conditions or riding style.

  • The R&D Solas 12/18 Concord Impeller will reduce cavitation and increase hook up, and add 1 full mph to top speed performance. For extreme rough water conditions or offshore racing, R&D offers the Solas Concord 12/18 Impeller Part # 131-01218.

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