I have a 35HP OMC IMARS (Improved Military Amphibious Reconnaissance System) with the Pump Jet and the Dewatering feature. This is the long shaft 18" model. These are incredibly rare and difficult to track down. What's even more rare is the USMC technical manual (included). And the Engine Suppressor (included). This Engine Suppressor lowers your thermal signature on the water and also reduces your engines noise level by roughly 20DB.
The Military had these commissioned in the 90's by OMC. They are like any other standard 2 cycle 2 stroke outboard motor with the exception of *indentations on the pistons. And the pump jet on the lower unit instead of a traditional prop.
They are able to withstand seven days total *immersion in the ocean at depths up to 400' deep and then able to be fired up topside after a couple of pulls by the starter expelling all water.
ACT Inc (Applied Combustion Technology) ACT, Inc. Orlando, Florida USA
based out of Orlando, FL is the Company that was commissioned to design and manufacture the Pump Jet for the DOD. They offer a lifetime warranty on all their products regardless of original ownership. I have had this motor fully serviced by ACT.
It runs exceptionally well. It always starts on the 2nd or 3rd pull. I don't really want to sell this after how much time it took to locate. But I have gotten a 55hp Johnson Enforcer now and simply don't have the room for storage. I reserve the right to decline this sale to anyone. If I don't deem your purpose and knowledge on the subject to be sufficient I will pass on the transaction.
IMARS being flushed at idle speed:
IMARS running wide open in the Gulf of Mexico:
DOD Fielding Plan for the IMARS :
DOD Safety Evaluation for the IMARS: