Stock XLT 1200 Waverunner Avg. Speed 56.5 mph @ 7050 RPM

Description of Parts RPM Top Speed
R&D XLT 1200 Ride Plate Kit
Part #: 122-12004
7050 58.5 mph
R&D XLT 1200 Aquavein Grate Kit
Part #: 112-12001
7050 59 mph
R&D XLT 1200 Pump Shoe Seal Kit
Part #: 162-00001
7050 59 mph
R&D XLT 1200 Anti Cavitation Cone
Part #: 162-12003
7050 59 mph
R&D XLT 1200 D-Plate Kit
Part #: 332-12000
7100 60 mph
R&D/Solas 12/18 Impeller
Part #: 132-01218
7100 60-61 mph
R&D XLT 1200 41cc Pro Series Head Kit
Part #: 412-20041
7150 61-61.5 mph
R&D Engine Control Unit (CDI)
Part #: 802-12000
7200 62 mph
R&D XLT 1200 Power Plenum Filter Kit Option
Part #: 200-00142
7200 62 mph



Parts/Kit Overview

The R&D Yamaha XLT 1200 Stage 1 Kit was developed to improve overall handling, reduce pump cavitation, and increase top speed performance with easy bolt on engine modifications! The entire Stage 1 Kit installs quickly and easily with basic hand tools. The R&D Stage 1 Kit is 92-Octane pump gasoline safe. NOTE: Carburetor rejetting is not required on Stage 1 Kits, unless adding a reed valve stuffer kit, or a power plenum filter kit.

  • The R&D XLT 1200 Ride Plate has been redesigned completely over the O.E.M. plate. The new R&D Ride Plate design incorporates the R&D GP1200R/GP1300R style flat keel design, along with a slight angle up (rocker), also similar to the proven R&D GP 1200R/GP 1300R design! The new R&D XLT Ride Plate will handle much better on high speed turns, and will substantially increase top speed performance.

  • The R&D Aquavein Intake Grate Kit will substantially reduce cavitation, increase overall handling dramatically and add a 3 to 4 mph average top speed in choppy water conditions!

  • The R&D Pump Shoe Sealer Kit was developed to quickly and easily fill the large casting pockets left in the Yamaha XLT 1200s pump shoe inlet. Installing the R&D Pump Shoe Sealer Kit and resealing the pump shoe will reduce low and high-speed cavitation, which will increase overall handling!

  • The R&D Anti-Cavitation Cone was developed to reduce low speed pump cavitation, which will increase acceleration and pump efficiency.

  • The R&D XLT 1200 D-Plate was designed to replace the O.E.M. Catalizer system with a simple bolt on part. The R&D Catalizer Removal Plate increases overall performance, allows you to use your choice of oils (many types of PWC oil will harm the O.E.M. catalizer) and increase top speed!

  • The R&D/Solas 12/18 Impeller replaces the O.E.M. impeller with a sleeker, better performing 3-blade design! Improved low-end response and increased top speed performance of 1 mph plus!

  • The R&D XLT 1200 41cc cast aluminum Pro Series Head Kit was developed to easily and inexpensively raise compression ratios to a recreationally safe level. Increased low-end power, and increased RPMs. R&D Pro Series Heads are girdle kit optional. Part # 412-12000

  • The R&D Engine Control Unit was developed to allow 4 adjustable rev limiter settings, and 4 dyno developed and proven timing maps. Substantially increased low-end power along with improved top-end performance. Increased rev limiter setting eliminates engine bog in rough water conditions.

  • The R&D Power Plenum Air Filter Kit will add to low-end response and acceleration, and allows for easier access to high-speed fuel turn jets, otherwise blocked by the O.E.M. air box. The R&D Power Plenum is necessary for easier carburetor tuning!

NOTE: When adding an R&D Reed Valve Stuffer Kit, Part # 272-12000, and an R&D Power Plenum Filter Kit, Part # 200-00142, it will become necessary to rejet the O.E.M. XLT 1200 carburetors. R&D offers a rejetting kit complete with needle valves, pilot and main jets, Part # 372-12000. R&D also offers extended high-speed T turn jets to replace the O.E.M. tamper capped turn jets. Part # 372-12001

NOTE: Higher performing engines, and/or heavily carboned exhaust systems put out more heat, which may cause the O.E.M. Cat overheat warning sensor to activate prematurely. To deactivate the overheat sensor, install the R&D Cat Sensor Chip. Part # 802-12001

NOTE: The O.E.M. power valves are manufactured from a cast aluminum material and are notorious for shearing or breaking after 40-50 hours, creating costly engine damage! R&D manufactures a redesigned 6061-T6 Billet aluminum Power Valve, and Power Valve Lifter Arm Kit that adds low-end power, and assurance against breakage! Part # 332-12002

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