When you start shopping for marine engines propulsion, the first fork in the road is whether you actually need a whole engine or just the component that brings an existing one to life. That's the choice here: the Yanmar 4LHA-STZP inboard marine diesel engine is a used 200 HP diesel ready for a full repower, while the Arco 70200 Marine Starter Motor is a new US-made starter for Ford 302/351 marine inboards. One is a big commitment; the other is a targeted fix.
Quick verdict
If your inboard already runs and the starter is the weak link, the Arco is the logical buy. If you're starting from a dead engine bay and want a complete marine diesel, the Yanmar is the only product here that can do that job. Just know that a used engine with ocean-freight logistics is a different world from a bolt-on starter.
Comparison at a glance
| Product | Price | Condition | Price Level | Key Specs |
|---|---|---|---|---|
| Yanmar 4LHA-STZP inboard marine diesel engine | USD 15,000.00 | Used | 200 HP | 4-stroke | Japan | |
| Arco 70200 Marine Starter Motor | USD 169.00 | New | 12V | CW rotation | Ford 302/351 |
Where each product wins
For a complete repower, the Yanmar wins because it gives you a full 200 HP inboard diesel with a Japanese pedigree. For owners with a Ford 302/351 or MerCruiser, OMC, or Volvo Penta Ford-based installation, the Arco wins as a small, new, US-made component that avoids turning a small electrical failure into a long boat project.
Yanmar 4LHA-STZP Inboard Marine Diesel Engine
The Yanmar is the only complete engine in this comparison. It's a used 4-stroke diesel rated at 200 HP, built in Japan, and offered as a tested-ok unit. If your boat needs a full propulsion replacement, this is a genuine repower path rather than a part. The trade-offs are substantial: it comes with no warranty, and the sale is structured for ocean-freight shipping from India to your nearest port, with transit of roughly 30 to 60 days. You'll also face extra local port charges and are responsible for customs clearance, including the ISF filing required for US ports. This is a purchase for a buyer who knows the engine-import process and can handle logistics, not a same-week bolt-in project.
Arco 70200 Marine Starter Motor
The Arco is a new, US-made starter motor for Ford 302/351 marine inboards and Ford-based MerCruiser, OMC, and Volvo Penta setups. It uses CW rotation, runs on 12V, and is marine ignition protected to meet USCG requirements. That makes it a direct-response fix if your current starter fails and your engine has the matching rotation. The main limitation is that it's only a starter-it won't cure deeper engine problems-and you must verify your engine's rotation direction before ordering because a wrong rotation can damage the engine. The Arco also carries a California Prop 65 lead warning. With a one-year warranty and a far smaller price, this is the lower-risk, faster-path option for many inboard owners.
Final choice by use case
Choose the Arco if you have a Ford 302/351 marine inboard and simply need a new ignition-protected starter. It's a new part, ships from a US warehouse, and keeps the fix contained. Choose the Yanmar if you need a complete used 200 HP diesel engine and you're comfortable with ocean freight, port fees, customs duties, and no warranty. The right move depends on whether you're repairing a propulsion system or replacing it.
