GP1800 2018-2020 harness and accessories

40 products

  • 2.5ft harness for oil pressure monitoring

    Karel Tuning 2.5ft harness for oil pressure monitoring

    5 in stock

    This sub-harness plugs into the oil pressure sensor connector in the main harness and allows monitoring of oil pressure in applications that use a sensor with a Metri-Pak style connector. Fits: Yamaha GP1800 series main harness Yamaha FX series main harness Yamaha FZR series main harness Note: Oil temperature cannot be monitored with this adapter harness.

    5 in stock

    $45.95

  • 20 Amp micro relay

    Karel Tuning 20 Amp micro relay

    10 in stock

    Correct replacement 20A micro relay for our main harnesses. Fits: Yamaha GP1800 series main harness Yamaha FX series main harness Yamaha FZR series main harness

    10 in stock

    $6.95

  • 2ft sub-harness for tunnel pressure sensor

    Karel Tuning 2ft sub-harness for tunnel pressure sensor

    5 in stock

    This harness allows logging and monitoring of tunnel pressure when using our Yamaha WaveRunner harness. Fits: Yamaha GP1800 series main harness Yamaha FX series main harness Yamaha FZR series main harness Please refer to the main harness documentation for proper ECU pin settings and calibration.

    5 in stock

    $46.95

  • Last stock! 3-port solenoid with mating connector and mounting bracket

    Karel Tuning 3-port solenoid with mating connector and mounting bracket

    1 in stock

    This kit contains a popular MAC 3-port solenoid with an aluminum mounting bracket and stainless steel hardware. It features a connector that fits our harnesses for a clean installation.

    1 in stock

    $99.95

  • 35 Amp relay

    Karel Tuning 35 Amp relay

    10 in stock

    Correct replacement 35A relay for our main harnesses. Fits: Yamaha GP1800 series main harness Yamaha FX series main harness Yamaha FZR series main harness

    10 in stock

    $6.95

  • Adapter harness for Bosch knock sensor

    Karel Tuning Adapter harness for Bosch knock sensor

    5 in stock

    This harness allows connecting to a Bosch-style two-wire knock sensor when using our Yamaha WaveRunner harness. Fits: Yamaha GP1800 series main harness Yamaha FX series main harness Yamaha FZR series main harness Please refer to the main harness documentation for proper ECU pin settings and calibration.

    5 in stock

    $44.50

  • Last stock! Adapter harness for Bosch LSU 4.9 wideband sensor

    1 in stock

    $31.00

  • Last stock! Adapter harness for NTK wideband sensor

    1 in stock

    $31.00

  • Billet aluminum modular bracket for Yamaha Fueltech harness

    Karel Tuning Billet aluminum modular bracket for Yamaha Fueltech harness

    3 in stock

    This bracket was developed for our watercraft applications that run the Fueltech FT550 ECU and it is sturdy yet lightweight, made of CNC billet aluminum. It features a modular design that allows mounting our 48-position relay box on one side and the other side features provisions for mounting a Yamaha starter solenoid, our solid-state main relay, and an auxiliary fuel pump relay. One side is angled to clear the contour of most Yamaha jetski watercrafts. Comes with stainless installation hardware.

    3 in stock

    $250.00

  • Cam position sensor connector kit - Engine Harness Side

    Karel Tuning Cam position sensor connector kit - Engine Harness Side

    Camshaft position Sensor connector kit for Yamaha Waverunners with the 1.8L HO and SVHO engines. This is the connector on the engine harness side. A complete kit contains: 1 connector G4 3 red seals A34 3 female contacts B15

    $15.95

  • Coil connector kit - Yamaha

    Karel Tuning Coil connector kit - Yamaha

    16 in stock

    A complete kit contains 1 Connector G9 3 seals A34 3 contacts + 1 spare B15

    16 in stock

    $9.95

  • Coolant temperature sensor connector

    Coolant temperature sensor connector

    6 in stock

    Yamaha GP1800 Coolant temperature sensor connector kit A complete kit contains 1 Connector K17 2 seals  2 contacts + 1 spare

    6 in stock

    $9.95

  • Crank position sensor connector - Harness side

    Karel Tuning Crank position sensor connector - Harness side

    Yamaha Waverunner 1.8L crankshaft position sensor connector kit. This is the harness-side connector. This kit is the engine harness side of the crank position sensor connector assembly. A complete kit contains: 1 connector G1 2 red seals A34 2 female contacts B16

    $10.55

  • Ignition bypass adapter harness

    Karel Tuning Ignition bypass adapter harness

    5 in stock

    This adapter connector allows turning on the ignition system on our Yamaha harnesses when performing firmware upgrades, datalogging or any operation that requires the system to be powered without the engine turning. Also allows connecting to the ECU via Wi-Fi during tuning sessions without the need for a USB cable. Fits: Yamaha GP1800 series main harness Yamaha FX series main harness Yamaha FZR series main harness

    5 in stock

    $10.95

  • Nexus S2/S3/R3 Billet aluminum modular bracket

    Karel Tuning Nexus S2/S3/R3 Billet aluminum modular bracket

    5 in stock

    This bracket was developed for our watercraft applications that run the Haltech Nexus S2 ECU and it is sturdy yet lightweight, made of CNC billet aluminum. It features a modular design that allows mounting our 48-position relay box on one side and the other side features provisions for mounting a Yamaha starter solenoid, our Ride controller and an auxiliary fuel pump relay. One side is angled to clear the contour of most Yamaha jetski watercrafts. Comes with stainless installation hardware. (ECU and solenoid not included)

    5 in stock

    $250.00

  • Nitrous sub-harness with solenoid and bottle pressure sensor connectors

    Karel Tuning Nitrous sub-harness with solenoid and bottle pressure sensor connectors

    5 in stock

    Connects to our main harness on the Yamaha GP1800 and FX series and enables the use of a nitrous solenoid and also provides a connection for a nitrous pressure sensor to the ECU.  

    5 in stock

    $68.00

  • OEM bilge pump with mating connector

    Karel Tuning OEM bilge pump with mating connector

    Out of stock

    Yamaha OEM Part number F1B-U8360-02-00

    Out of stock

    $109.00

  • Pressure Sensor Connector - AEM Style

    Pressure Sensor Connector - AEM Style

    10 in stock

    A complete kit contains 1 Connector H23 3 contact B19 + 1 Spare

    10 in stock

    $9.95

  • Reverse motor signal connector (Old style)

    Karel Tuning Reverse motor signal connector (Old style)

    This connector fits the older style Yamaha Waverunners Ride motor on the engine harness side.  A complete kit contains 1 connector N13 16 seals A50 16 contacts + 1 extra B35 12 cavity plugs A52

    $35.95

  • Reverse pedal connector

    Karel Tuning Reverse pedal connector

    Yamaha 1.8L waverunner reverse position sensor connector kit. Fits all Yamaha waverunner newer models with Ride reverse. A complete kit contains 1 Connector K11 6 seals A53 7 contacts B15

    $17.95

  • Ride motor connector kit - Yamaha, engine harness side

    Karel Tuning Ride motor connector kit - Yamaha, engine harness side

    10 in stock

    A complete kit contains 1 Connector G1 2 seals A34 2 contacts B16

    10 in stock

    $14.95

  • Sealing plug for buzzer connector

    Karel Tuning Sealing plug for buzzer connector

    10 in stock

    This connector is intended to keep the harness waterproof in applications that use the OEM Yamaha CAN bus based dash for display. Since the OEM dash connects directly to the buzzer, the connector on the harness needs a sealing plug to remain waterproof.  See main harness instructions for how to use this connector. Fits: Yamaha GP1800 series main harness Yamaha FX series main harness Yamaha FZR series main harness

    10 in stock

    $8.95

  • Sealing plug for flex fuel sensor connector

    Karel Tuning Sealing plug for flex fuel sensor connector

    10 in stock

    This connector is intended to keep the harness waterproof in applications that do not have a flex fuel sensor installed Fits: Yamaha GP1800 series main harness Yamaha FX series main harness Yamaha FZR series main harness

    10 in stock

    $7.45

  • Sealing plug for Haltech dash connector

    Karel Tuning Sealing plug for Haltech dash connector

    10 in stock

    This connector is intended to keep the harness waterproof in applications that do not have a Haltech dash installed Fits: Yamaha GP1800 series main harness Yamaha FX series main harness Yamaha FZR series main harness

    10 in stock

    $7.75

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