Mobile service — we come to you in Gulfport, St. Petersburg, South Pasadena and nearby
Mobile outboard service at your dock, slip, or driveway — St. Pete and the surrounding coast
5 · 87 Google reviews
- Yamaha
What we do
Services
Outboard Service & Repair
Scheduled maintenance, diagnostics, and mechanical repair on Yamaha and other four-stroke outboards — done at your dock or driveway.
Lower Unit Service
Gear lube service, pressure testing, seal replacement, and complete lower unit sourcing when a rebuild is past due.
Engine Installation
New outboard installation, rigging, and commissioning — from hanging the motor to the first sea trial.
Helm & Controls
Helm replacement, steering system service, and control rigging on outboard-powered boats.
Fuel System Repair
Ethanol-damaged lines, clogged VST injectors, primer bulbs, and filters — the most common no-start causes on Tampa Bay boats.
Marine Electrical
Batteries, charging systems, bilge pumps, gauges, and multi-engine wiring harnesses.

Built for the water. Ready at your dock.
Word on the dock
What customers say
I'm very happy my neighbor referred me to Jake and Joe Duff, owners of Duffman Marine. I needed a lower unit for my Yamaha F300, and Jake was able to source a new pair of lower units for almost the cost of one at a large local dealership, which was huge. Communication was excellent from start to finish, everything happened exactly as promised, and now my Grady White is ready to run hard for another 1,500 hours. Saint Petersburg, Gulfport, and South Pasadena are lucky to have dedicated, honest marine mechanics growing their business in our area. On top of it all, Jake and Joe are genuinely great guys. Highly recommend Duffman Marine.
Jake came highly referred and now I know why. I recently used him to hang a new motor and replaced the helm on my flat boat. He was thorough, knowledgeable, patient and especially good about keeping me updated and suggesting options. I have found my new Marine mechanic.
We had our 2014 Robalo serviced and couldn't be more impressed with the work our mechanic did. He was professional, honest, and incredibly knowledgeable. He explained everything clearly, kept us updated, and treated our boat like it was his own. The Robalo is running better than ever, and the quality of the service truly shows. It's hard to find someone you can fully trust with your boat, but we're grateful we found him. Highly recommend to anyone needing a reliable and skilled boat mechanic!
If you are from Saint Petersburg or Tampa Bay area and you were looking For a top-notch best mechanic in the city you found them. I Originally brought my boat in to get 3 Steering wheels and 3 controls wired up on a time crunch and Jake and the crew knocked me out in Just a couple days. I ran the boat and everything worked great without any hiccups other than I blew my old 2004 2stroke. I texted DuffMan At 7 in the morning told them I only had a couple days before season And I needed a new Yamaha 4stroke Within an hour, he had already quoted me for both engines I was looking at. I could not be more pleased with the price or the quality of the work. These guys will be my mechanics for years to come thank you very much for all your help.
Where we work
Service area
Gulfport
- Gulfport Municipal Marina
St. Petersburg
- Maximo Marina
- Salt Creek Marina
- Harborage Marina
- St. Petersburg Municipal Marina
- Demens Landing boat ramp
South Pasadena
Tierra Verde
- Fort De Soto boat ramp
- Tierra Verde Marina
Clearwater
- Clearwater Beach Marina
- Seminole Boat Ramp
Madeira Beach
- Madeira Beach Municipal Marina
Boat acting up?
One call and it's handled — no haul-out, no yard wait.