# Twin Power 37-99 Big Twin Except 99 Twin Cam Oil Pump Check Ball Replaces H-D 8866

Twin Power's Oil Pump Check Ball for 1937-1999 Big Twin models (excluding 1999 Twin Cam) is a precision steel component that works with the pump check system to help maintain proper oil pressure, prevent drain back when the engine is off, and provide a reliable replacement option for worn or pitted original parts in stock or rebuilt motors.

-   Helps maintain proper oil pressure and prevents oil drain back
-   Fits 1937-1999 Big Twin models (except 1999 Twin Cam)
-   Includes (10) oil pump check valve balls.
-   Direct replacement for OEM H-D 8866

This Part Fits:

Year

Make

Model

Submodel

1971-1980

Harley-Davidson

FLH Electra Glide

Base

1994-1998

Harley-Davidson

FLHR Road King

Base

1998

Harley-Davidson

FLHRCI Road King Classic

Base

1996-1997

Harley-Davidson

FLHRI Road King

Base

1980-1984,1987-1993

Harley-Davidson

FLHS Electra Glide Sport

Base

1986-1998

Harley-Davidson

FLHT Electra Glide Standard

Base

1983-1998

Harley-Davidson

FLHTC Electra Glide Classic

Base

1996-1998

Harley-Davidson

FLHTCI Electra Glide Classic

Base

1989-1997

Harley-Davidson

FLHTCU Electra Glide Ultra Classic

Base

1995-1998

Harley-Davidson

FLHTCUI Electra Glide Ultra Classic

Base

1986-1990

Harley-Davidson

FLST Heritage Softail

Base

1988-1999

Harley-Davidson

FLSTC Heritage Softail Classic

Base

1990-1999

Harley-Davidson

FLSTF Fat Boy

Base

1993

Harley-Davidson

FLSTN Heritage Softail Nostalgia

Base

1994-1996

Harley-Davidson

FLSTN Heritage Softail Special

Base

1997-1999

Harley-Davidson

FLSTS Heritage Springer

Base

1971-1978

Harley-Davidson

FX Super Glide

Base

1980-1982

Harley-Davidson

FXB Sturgis

Base

1995-1998

Harley-Davidson

FXD Dyna Super Glide

Base

1983

Harley-Davidson

FXDG Disc Glide

Base

1993-1998

Harley-Davidson

FXDL Dyna Low Rider

Base

1993-1998

Harley-Davidson

FXDWG Dyna Wide Glide

Base

1974-1984

Harley-Davidson

FXE Super Glide

Base

1979-1985

Harley-Davidson

FXEF Fat Bob

Base

1987-1994

Harley-Davidson

FXLR Low Rider Custom

Base

1977-1982

Harley-Davidson

FXS Low Rider

Base

1983-1985

Harley-Davidson

FXSB Low Rider - Belt

Base

1984-1999

Harley-Davidson

FXST Softail Standard

Base

1999

Harley-Davidson

FXSTB Night Train

Base

1986-1999

Harley-Davidson

FXSTC Softail Custom

Base

1988-1999

Harley-Davidson

FXSTS Springer Softail

Base

1995-1997

Harley-Davidson

FXSTSB Bad Boy

Base

1980-1986

Harley-Davidson

FXWG Wide Glide

Base

1958-1976

Harley-Davidson

XLCH

Base

## Details

- **Price:** 39.26 CAD
- **Vendor:** TwinPower
- **Type:** Oil Pumps

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 39.26 CAD | In stock |

## Images

- Photo - Primary

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/twin-power-37-99-big-twin-except-99-twin-cam-oil-pump-check-ball-replaces-h-d-8866)
> Updated: 2026-07-01