#7M AI Surface Drive Kit

Arneson Industries offers a alternative to the Bravo, the #7M AI Surface Drive Kit. With both right and left hand rotations, combined with our stand off box, Arneson Industries offer a real solution to costly Outdrive repairs and proven reliable performance.

Developed as an AI replacement for the *Bravo with our own standoff box that allows the engine to remain in the current location. Coupled with a Velvet Drive transmission, the AI Surface Drive couples to the standoff box that houses the transmission, enabling the balance (CG) to stay the same as well as maintain current engine room configuration. This also saves valuable engine room space saving the rear seat area for your use and eliminating any hatch modifications.

The AI Standoff Box covers the existing holes that are in the boat’s transom from the Bravo or other outdrive. Removing the need to plug holes or cutouts. Simply mount the AI Standoff Box, which is predrilled and O-ringed for the #7M Drive Unit, and your drive installation is complete. Hydraulic thru-hull fittings are included pre-mounted in the standoff box.

The #7M Kit is ideal for new installations where by you want a reliable high performance outdrive on your new boat. Installation takes just a few short hours and requires the use of a drill, and a few hand tools.

The #7M Conversion Kit allows the use of an AI Surface Drive #7M Drive Unit in place of a conventional I/O Unit. The #7M Conversion Kit maintains the engines current I/O For/Aft location, maintaining the boats current engine CG placement.


The following components are included in the #7M Conversion Kit:

  • Char-Lynn Hydraulic Helm Unit
  • Rear HD Engine Mount
  • HD Drive Plate
  • Velvet Drive© Transmission Bellhousing
  • BAM Marine Modified Velvet Drive© Transmission
  • Drive Line
  • AI Standoff Box
  • AI #7M Drop Box Drive Unit, Complete with External Hydraulic Steering and Trim Cylinders, choice of RH or LH rotations, choice of reduction/overdrive ratios: 1:1, 1.32:1 and 1.56:1, Trim Pump, Backing Plates and Mounting Bolts.

About the #7M Drive Kit, the #7M Drive Kit weighs 300 lbs included in this weight are the external hydraulic steering cylinder, trim cylinder, trim pump, mounting bolts, external hydraulic hoses, transmission, drive line, AI Stand Off Box, Bellhousing and Drive Plate.

The #7M Kit has a full hydraulic steering system, no cables or steering valves to generate slop in the steering wheel. Your Powersteering pump supplies pressure to the hydraulic helm unit (Supplied) which is plumbed to the steering cylinder (s).

The #7M Kit has a 26 tooth spline propeller shaft, same as the Mercury SSM#6 drive units, removing the need for any special propellers as the standard Mercury Speed Master propeller will fit the propeller shaft. Rolla and Hering also fit the propeller shaft.

The #7M Kit comes with a one year warranty with a 750 lbs of torque rating along with a transmission that is suited for the application.

The #7M drive unit when coupled to a modified transmission unit has a lower HP loss than that of a Bravo, which in turns puts more power to the water.

The #7M has a small drop center distance, eliminating the need to mount the engine high in the boat and this in turn helps the balance of the boat. The crankshaft center line is roughly 13″ upward from the bottom of the boat depending upon transom angle.


*One year Warranty on the #7M Drive Unit, along with a One Year Warranty on the BAM Transmission when used in approved applications.


AI is not affiliated with and is not an authorized Twin Disc distributor or service dealer.

What Arneson Industries Can Do For You
Reliability, Very few moving parts means very few things go wrong.
Efficiency, Very low parasitic drag means more of your engines HP going to the water.
Speed, Low drag design means the boat is getting maximum efforts of your engine horse power.
Fuel Mileage, With a 30% speed increase, you can go 30% faster at the same engine rpm which translates into better fuel mileage for your boat.
Lower Maintenance, With fewer moving parts than conventional propulsion systems, typical maintenance is down to 200 hour oil changes and electrolysis anode replacements.