Yamaha OX66 Keihin fuel injector service kit — fat lower seal variant
Fat lower seal variant Thin lower seal variant Keihin EFI outboard injector

Both lower seal variants shown. The kit includes both thicknesses — match to what's in your engine and discard the other.

Yamaha OX66 Injector Service Kit

Complete rebuild kit for all 6 injectors in Yamaha OX66 2-stroke EFI outboards (150-250hp, 1997-2005). Includes both lower seal thicknesses — 5.4mm and 8.2mm — so it works regardless of which variant your engine has.

What's in this kit (all 6 injectors)

  • 6x inlet filter screens (micro basket)
  • 6x upper fuel rail o-rings
  • 6x upper injector grommets
  • 6x lower intake seals — 5.4mm (thin) AND 8.2mm (fat) both included per injector
  • 6x pintle caps
Lower seal note: Two different lower intake seal thicknesses exist across the OX66 family — 5.4mm (thin) and 8.2mm (fat). Both are included in this kit. Use the one that matches your existing seal and set the other aside. The photos show both variants — compare yours before installing.
Complete 6-injector engine kit
$39.99
Free shipping — USPS Ground Advantage
Shop-verified: We use these exact kits on injectors we service here. Same parts, same supplier — if we trust them in customer engines, we're confident selling them to you.

Kit covers all 6 injectors for one complete engine service. We strongly recommend replacing all 6 at once — mixing old and new seals can cause uneven fuel delivery.

Compatibility

The Keihin 65L-13761 is part of the Keihin Long injector family — a body platform used across Yamaha OX66 marine engines, Mercury/Mariner 2-stroke EFI outboards, and Honda/Acura B-series automotive applications. The OX66 covered the entire 2-stroke EFI V6 lineup from 1997 through 2005 (150–250hp), and the same body and seal dimensions cross to B18 and B16 engines in the Integra and Civic.

Yamaha OX66 2-Stroke EFI

OEM Injector # HP / Engine Years Notes
65L-13761-00-00
Also: 65L-13761-01-00		 150hp / OX66 V6 2-stroke EFI 1997–2005 6 injectors per engine. High impedance (~12 ohm). ~500 cc/min.
65L-13761-00-00 175hp / OX66 V6 2-stroke EFI 1997–2005 Same injector. Confirm via engine serial number on Yamaha's parts lookup.
65L-13761-00-00 200hp / OX66 V6 2-stroke EFI 1997–2005 6 injectors per engine.
65L-13761-00-00 225hp / OX66 V6 2-stroke EFI 1997–2005 6 injectors per engine.
65L-13761-00-00 250hp / OX66 V6 2-stroke EFI 1997–2005 6 injectors per engine.

Mercury/Mariner 2-Stroke Keihin EFI

The Mercury/Mariner EFI outboards from 1998-2005 used Keihin injectors on the same body platform. Our shop has serviced these along with the OX66 units. Verify your injector body matches the photos before ordering.

OEM Part # HP / Engine Years Notes
Mercury 18715T
Also: 18715, 18715T1, 14627		 150–300hp / Mercury Mariner V6 2-stroke EFI 1998–2005 Two impedance variants: pink tip (low impedance, ~2 ohm) and white tip (high impedance, ~12 ohm). High-impedance white tip variant shares the Keihin body. Confirm impedance with a multimeter before ordering.

Honda / Acura B-Series (Long Keihin Body)

The OX66 is part of the Keihin "Long" injector family — the same body format Honda and Acura used in B-series engines. The micro basket inlet filter is the same part. Both seal kits include two lower seal thicknesses for the same reason: variation across production runs. This kit fits the OEM injectors in the applications below. Note: B-series engines use 4 injectors, so you'll have 2 extra seal sets from this kit.

Engine Application Years Notes
B18B1 Acura Integra LS / GS / RS 1994–2001 Long Keihin body. ~240cc stock. 4 injectors per engine.
B18C1 Acura Integra GS-R 1994–2001 Long Keihin body. ~290cc stock. 4 injectors per engine.
B18C5 Acura Integra Type R 1997–2001 Long Keihin body. ~315cc stock. 4 injectors per engine.
B16A2 Honda Civic Si 1999–2000 Long Keihin body. ~240cc stock. 4 injectors per engine.
Turbo builds: The OX66 65L-13761 (~500cc) is a well-known drop-in upgrade for turbocharged B-series builds — same Long Keihin body, installs directly in the OEM rail without adapters. If you're running OX66 injectors in a Civic or Integra, this is the correct rebuild kit for those injectors.

Cross-Reference Part Numbers

Yamaha 65L-13761-00-00 Yamaha 65L-13761-01-00 Mercury 18715T Mercury 18715T1 Mercury 14627 Mercury 805225A1 Honda 06164-P72-010 Honda 16450-P72-010 Honda 16450-P30-J01

Don't confuse the OX66 with the Yamaha HPDI (High Pressure Direct Injection) system — those are a different design. Also don't confuse with the 4-stroke Yamaha F115/F150/F200 injectors (6DA-13761 series) — different body, not compatible with this kit. The OX66 is specifically the 2-stroke V6 EFI with a yellow injector body, produced 1997-2005.