Verner's VM133S is built from the standard 84hp VM133MK. The only difference is the intake manifold with single altitude compensating carburetor making the VM133S easier to tune. There is a small reduction in power and torque. All other specifications and dimensions identical to VM133MK. Verner recommends this engine where very low vibration and ease of maintenance is desired.

Technical specifications: Displacement Bore Stroke Compression ratio  Maximum power Max. continuous power Torque Fuel Consumption Propeller rotation Weight Ignition timing  Spark plugs Spark plug gap Electric starter Generator (Alternator) Lubrication Oil Capacity Fuel Fuel pump Carburetor Reduction drive Propeller hub Recommended TBO

1330 cc /85.19 cubic inch 97 mm /3.81 inch 90 mm /3.54 in 1 : 9.5        78 BHP (61 kW) @ 5500 RPM (5 minutes max.)      72 BHP (52 kW) @ 4500 RPM                        115 Nm (85 ft/lb) @ 4000 RPM 210g/HP/hour (285g/kWh) at maximum continuous power (0.47 lb/hph) CCW (left) facing the front, (tractor propeller) Dry weight: 60 kg (132lb.), oil cooler: 1 kg(2.2lb), exhaust pipe: ~4 kg(8.8lb.) 5° BTDC up to 2500 RPM, after, electronically variable NGK DCPR9E R diameter 12 mm 0.4 mm (0.016 in) 12 V/1000 W 12 V/160 W (13 Amp) semi-synthetic motorcycle oil SAE 15W-50, JASO MA   Recommendations: DENICOL Pro 2000 racing motorcycle oil                             Aeroshell 15W-50 semi-synthetic 2.5 ÷ 3 liters Filter: Napa Gold 1083 aviation petrol 100 LL AvGas or auto petrol, octane number 92 or higher Pierburg 7.20971.63 1 × Bing 64 Constant Velocity 1 : 2 or 1 : 2.29 gear box, lubricated with motor oil 75 mm B.C. × 6 × M8 mm tapped holes and Rotax standard on request 1000 hours