Mar 13

Mar 13 - Mar 15

Spring Thunder Tavares Fl.

VINTAGE

Lake Dora

Tavares, FL

Apr 10

Apr 10 - Apr 12

2026 Jesup Championships

PRO-KPH-MOD-SO-J CLSES

Lake Lindsay Grace

Jesup, GA

Apr 11

Apr 11 - Oct 12

2026 Blue Water Resort & Casino ...

INB-MOD-SO-J CLSES

Colorado River

Parker, AZ

May 9

May 9 - May 17

2026 World Jet Boat Marathon Cha...

JRR;W

Payett,Salmon.Clearwater,Snake,St.Joe rivers

Emmet, Idaho , ID

May 15

May 15 - May 17

Thunder on Cocoa Beach

OS;N

Atlantic

Cocoa Beach FL, FL

May 16

May 16 - May 17

Harford County Spring Nationals

INB

Bush River

Edgwwood, MD

May 29

May 29 - May 31

Inboard Driving School

INB

Champions Lake Park

SPRINGFIELD, OH

May 30

May 30

Spring Testing

VINTAGE-INB-UNL

Columbia River

Kennewick, WA

Jun 5

Jun 5 - Jun 7

Rumble on the River

VINTAGE

Piney Point, Md.

City, ST

Jun 5 - Jun 7

Piney Point Rumble on the River

VINTAGE

St. George\'s Creek

St. George’s Creek, MD

Jun 6

Jun 6 - Jun 7

Hardys Race for the Lake

INB;N

Lake Decatur

Decatur, IL, IL

Jun 6 - Jun 7

Queen Marinette Regatta

PRO-KPH

Menominee River

Marinette, WI

Jun 13

Jun 13 - Jun 14

Entiat Vintage Raceboat Regatta

VINTAGE

Lake Entiat

Entiat, WA

Jun 20

Jun 20 - Jun 21

Governors Cup Regatta

INB;D

Grand Lake St Marys

Celina, OH

Jun 20 - Jun 21

Syracuse Vintage Race Boat Regat...

VINTAGE

Onondaga Lake - Willow Bay

Liverpool, NY

Jun 26

Jun 26 - Jun 28

51st Annual Idaho Regatta - APBA...

INB-SO-J CLSES

Snake River

Burley, ID

mobile menu
expand
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