Iron Stable

Harley-Davidson TOURING ROAD KING Big Bore Kits

Genuine HD big bore kits and aftermarket alternatives that fit the TOURING ROAD KING — all years. Select your year for exact fitment and pricing.

Select your year for exact fitment & prices

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Genuine Harley-Davidson (26)

Screamin' Eagle 131ci Stage IV Big Bore Kit

Genuine Harley-Davidson

Screamin' Eagle 131ci Stage IV Big Bore Kit

92500079
Iron Pass £3352.86£3944.54View
Screamin' Eagle 131ci Stage IV Big Bore Kit

Genuine Harley-Davidson

Screamin' Eagle 131ci Stage IV Big Bore Kit

92500081
Iron Pass £3352.86£3944.54View
Screamin' Eagle 103ci Stage IV Power Kit

Genuine Harley-Davidson

Screamin' Eagle 103ci Stage IV Power Kit

27517-08E
Iron Pass £2467.89£2903.40View
Screamin' Eagle 122ci Stage III Big Bore Kit

Genuine Harley-Davidson

Screamin' Eagle 122ci Stage III Big Bore Kit

92500086
Iron Pass £1726.89£2031.64View
Screamin' Eagle 128CI Stage IV Performance Kit, Black

Genuine Harley-Davidson

Screamin' Eagle 128CI Stage IV Performance Kit, Black

92500077
Iron Pass £3352.86£3944.54View
Screamin' Eagle Stage II Bolt-On Power Kit

Genuine Harley-Davidson

Screamin' Eagle Stage II Bolt-On Power Kit

92500075A
Iron Pass £474.05£557.71View
3-7/8" Standard Bore Piston Kit

Genuine Harley-Davidson

3-7/8" Standard Bore Piston Kit

22144-08B
Iron Pass £323.92£381.08View
Screamin' Eagle 4-Inch Big Bore Conversion Kit

Genuine Harley-Davidson

Screamin' Eagle 4-Inch Big Bore Conversion Kit

92500039
Iron Pass £1148.32£1350.96View
Big Bore Head Gasket Kit

Genuine Harley-Davidson

Big Bore Head Gasket Kit

16101-01
Iron Pass £48.25£56.76View
Screamin' Eagle 103 Stage IV Performance Kit

Genuine Harley-Davidson

Screamin' Eagle 103 Stage IV Performance Kit

27516-08F
Iron Pass £2467.89£2903.40View
Screamin' Eagle MVA CNC Ported Cylinder Heads

Genuine Harley-Davidson

Screamin' Eagle MVA CNC Ported Cylinder Heads

16925-11
Iron Pass £1422.25£1673.23View
Screamin' Eagle 128ci Stage IV Performance Kit

Genuine Harley-Davidson

Screamin' Eagle 128ci Stage IV Performance Kit

92500078
Iron Pass £3352.86£3944.54View
Flat-Top Cast Pistons, 3-7/8" Std Bore, 1550cc

Genuine Harley-Davidson

Flat-Top Cast Pistons, 3-7/8" Std Bore, 1550cc

22851-99A
Iron Pass £229.10£269.53View
Screamin' Eagle 103 Stage IV Performance Kit

Genuine Harley-Davidson

Screamin' Eagle 103 Stage IV Performance Kit

92500018A
Iron Pass £2307.64£2714.87View
Screamin' Eagle Milwaukee-Eight 117 Stage IV Kit

Genuine Harley-Davidson

Screamin' Eagle Milwaukee-Eight 117 Stage IV Kit

92500073
Iron Pass £2589.05£3045.94View
Screamin' Eagle Stroker Flywheel Kit, Twin Cam

Genuine Harley-Davidson

Screamin' Eagle Stroker Flywheel Kit, Twin Cam

23600-00A
Iron Pass £1541.80£1813.88View
Stage II Bolt-On Performance Upgrade Kit

Genuine Harley-Davidson

Stage II Bolt-On Performance Upgrade Kit

92500058A
Iron Pass £447.71£526.72View
Screamin' Eagle 110CI Stage III Upgrade Kit

Genuine Harley-Davidson

Screamin' Eagle 110CI Stage III Upgrade Kit

92500035
Iron Pass £1774.30£2087.41View
Screamin' Eagle Stage 2 Bolt-On Power Kit

Genuine Harley-Davidson

Screamin' Eagle Stage 2 Bolt-On Power Kit

92500074A
Iron Pass £474.05£557.71View
Screamin' Eagle 114CI Stage IV Upgrade Kit

Genuine Harley-Davidson

Screamin' Eagle 114CI Stage IV Upgrade Kit

92500062
Iron Pass £2589.05£3045.94View
Screamin' Eagle 131CI Stage IV Upgrade Kit

Genuine Harley-Davidson

Screamin' Eagle 131CI Stage IV Upgrade Kit

92500080
Iron Pass £3352.86£3944.54View
Screamin' Eagle 117ci Crate Engine

Genuine Harley-Davidson

Screamin' Eagle 117ci Crate Engine

16200985
Iron Pass £6789.14£7987.22View
Screamin' Eagle Stage 2 Bolt-On Power Kit

Genuine Harley-Davidson

Screamin' Eagle Stage 2 Bolt-On Power Kit

92500047A
Iron Pass £447.71£526.72View
Screamin' Eagle 119CI Stage III Upgrade Kit

Genuine Harley-Davidson

Screamin' Eagle 119CI Stage III Upgrade Kit

92500084
Iron Pass £1726.89£2031.64View
Screamin' Eagle 131CI Stage IV Upgrade Kit

Genuine Harley-Davidson

Screamin' Eagle 131CI Stage IV Upgrade Kit

92500082
Iron Pass £3352.86£3944.54View
High-Compression Piston Kit, 4.060", Standard Bore

Genuine Harley-Davidson

High-Compression Piston Kit, 4.060", Standard Bore

22574-10
Iron Pass £370.46£435.83View

Aftermarket alternatives

Aftermarket big bore kits that fit the TOURING ROAD KING. Genuine Harley-Davidson is listed above, not here.

S&S 131CI & 136CI BIG BORE STROKER CYLINDERS FOR MILWAUKEE EIGHT

S&S Cycle

S&S 131CI & 136CI BIG BORE STROKER CYLINDERS FOR MILWAUKEE EIGHT

In stock
Iron Pass £1321.99£1555.28View
S&S 131CI & 136CI BIG BORE STROKER CYLINDERS FOR MILWAUKEE EIGHT

S&S Cycle

S&S 131CI & 136CI BIG BORE STROKER CYLINDERS FOR MILWAUKEE EIGHT

In stock
Iron Pass £1321.99£1555.28View
S&S 4.32" BIG BORE KITS FOR MILWAUKEE EIGHT

S&S Cycle

S&S 4.32" BIG BORE KITS FOR MILWAUKEE EIGHT

In stock
Iron Pass £1321.99£1555.28View
S&S 4.32" BIG BORE KITS FOR MILWAUKEE EIGHT

S&S Cycle

S&S 4.32" BIG BORE KITS FOR MILWAUKEE EIGHT

In stock
Iron Pass £1286.62£1513.67View
S&S BIG BORE GASKETS FOR MILWAUKEE EIGHT

S&S Cycle

S&S BIG BORE GASKETS FOR MILWAUKEE EIGHT

In stock
Iron Pass £136.66£160.78View
S&S 131CI & 136CI BIG BORE STROKER CYLINDERS FOR MILWAUKEE EIGHT

S&S Cycle

S&S 131CI & 136CI BIG BORE STROKER CYLINDERS FOR MILWAUKEE EIGHT

In stock
Iron Pass £1254.45£1475.82View
S&S 131CI & 136CI BIG BORE STROKER CYLINDERS FOR MILWAUKEE EIGHT

S&S Cycle

S&S 131CI & 136CI BIG BORE STROKER CYLINDERS FOR MILWAUKEE EIGHT

In stock
Iron Pass £1321.99£1555.28View
3 5/8" BIG BORE CYLINDERS AND PISTONS FOR EVOLUTION BIG TWIN

V-Twin

3 5/8" BIG BORE CYLINDERS AND PISTONS FOR EVOLUTION BIG TWIN

In stock
Iron Pass £376.13£442.50View
3 5/8" BIG BORE CYLINDERS AND PISTONS FOR EVOLUTION BIG TWIN

V-Twin

3 5/8" BIG BORE CYLINDERS AND PISTONS FOR EVOLUTION BIG TWIN

In stock
Iron Pass £283.68£333.74View
HIGH COMPRESSION 132CI & 136CI BIG BORE KITS

S&S Cycle

HIGH COMPRESSION 132CI & 136CI BIG BORE KITS

In stock
Iron Pass £1360.41£1600.48View
S&S 4.32" BIG BORE KITS FOR MILWAUKEE EIGHT

S&S Cycle

S&S 4.32" BIG BORE KITS FOR MILWAUKEE EIGHT

In stock
Iron Pass £1321.99£1555.28View
S&S BIG BORE KITS FOR MILWAUKEE EIGHT

S&S Cycle

S&S BIG BORE KITS FOR MILWAUKEE EIGHT

In stock
Iron Pass £1321.99£1555.28View