Aug 8

Aug 8 - Aug 9

TCPBA Chetek Watermania VI

OPC

Lake Chetek

Chetek, WI

Aug 8 - Aug 9

Top O Michigan Marathon National...

SO;N-J CLSES

Inland Waterway

Indian River, MI

Aug 8 - Aug 9

Leo Fry Memorial

OB RR

Rogue River

Agness, OR

Aug 14

Aug 14 - Aug 16

Summer Moses Lake

PRO-MOD-SO

Moses Lake

Moses Lake, WA

Aug 15

Aug 15 - Aug 16

Quake On The Lake

SE-VINTAGE-INB

Pontiac Lake

Waterford, MI

Aug 15 - Aug 16

Powerboats at the Park/Lauterbac...

VINTAGE

Elizabeth River

Portsmouth, VA

Aug 15 - Aug 16

Rock Falls River Chase Regatta

MOD-SO-J CLSES

Rock River

Rock Falls, IL

Aug 15 - Aug 16

Strong Racing presents the 2026 ...

SE-INB;D-VINTAGE-KPH-MOD-SO-OPC-J CLSES

Columbia River

Pateros, WA

Aug 15 - Aug 16

2026 Kittanning Riverbration

MOD-SO-J CLSES

Allegheny River

Kittanning, PA, PA

Aug 15 - Aug 16

ASBR Pro Racing Series Race #4

JET SPRI

State Fair Park Jetsprint Track

Yakima, WA

Aug 15 - Aug 16

Battle At the Buck

OPC

Lake Minnewaska

Starbuck, MN

Aug 22

Aug 22 - Aug 23

Sandy Beach Hydro Regatta

VINTAGE-INB

Indian Lake

Lakeview , OH

Aug 22 - Aug 23

Wild Ones Regatta

SO-J CLSES

Grass Lake

Grass Lake, MI

Aug 22 - Aug 23

Clash at Cougar Lane

OB RR

Rogue River

Agness, OR

Aug 29

Aug 29 - Aug 30

Moses Lake Vintage Hydroplane Ev...

VINTAGE

Moses Lake

Moses Lake, WA

Aug 29 - Aug 30

Thunder on the Choptank

INB

Choptank River

Cambridge, MD

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Modified Outboard Menu

Modified Outboard

Modified-Outboard

MOD racers aren't afraid to get their hands dirty - The goal in this category is to pull every last bit of horsepower out of your engine. In Modified Outboard, the engine builder's skill is just as important as the driver's. These boats are easily recognizable by their specially tuned pipes that make them as loud as they are fast. Because engines are constantly being modified to make the absolute most of what the rules allow, the competition is always fierce. Join the ranks of some of the best engine builders in the world, join Modified Outboard Racing.

Whether hydroplane or runabout, Modified classes are defined by the size of their engines (displacement). The numbers in the class names give you the approximate engine size in cubic centimeters. The 250ccMH, or 250 cubic centimeter Mod Hydro, is smaller than the 850ccMH, or 850 cubic centimeter Mod Hydro. Some classes have minimum weights, which increase with engine size. The smaller classes are often a good fit for younger, lighter drivers (14-year-olds may drive 200-250cc Mod classes, for example). The larger classes take considerable skill and experience. Propellers of four blades or less are used, and your prop choice can affect your speed enormously.

Modified Outboard Resources

Modified Outboard Classes