Rato Combustion Engines

Rato engines — petrol and diesel

Rato builds single-cylinder air-cooled engines in two fuel versions: OHV petrol units for equipment that runs in bursts, and diesels marked with a D (RV…D) for continuous duty. The number in the designation corresponds roughly to displacement, so an R390 is an engine of around 390 cm³.

Matching a Rato engine to your machine

Four figures decide whether the swap works; the model name alone tells you little.

• Output — stay within roughly 10% of the original rating. An underpowered unit bogs down under load, an overpowered one strains the clutch and frame.
• Shaft diameter and length — up to about 6 HP usually 19.05 mm, above that most often 25.4 mm; those 6 mm mean a new clutch or pulley. The same model is often built in several shaft versions, so measure the shaft in the machine first.
• Mounting hole pattern — near-identical across the small engine standard, but worth measuring on a shop-built frame.
• Drive take-off type — a plain shaft with keyway, a tapered shaft, or a version with reduction gearbox.

For complete machines rather than power units, see our single-direction vibratory plates and generators.

Running and servicing a Rato engine

The first oil change falls after about 20 running hours, later ones every 100. Clean the air filter roughly every 25 hours, and check it daily when the machine is cutting concrete or compacting aggregate. Service parts sit under filters for combustion engines.

Frequently asked questions about Rato engines

Rato engines at NORWIT.PL

We supply Rato engines as power units for new equipment and as replacements for worn ones. Send us the output, shaft diameter and mounting pattern of the old engine and we will confirm which model fits. Orders are placed online.