The Saito MU-35-2 is a single-cylinder, 4-stroke gasoline engine purpose-built for model aircraft and lightweight power applications. Delivering 3.8 HP across a 1,700 to 9,000 RPM operating band, this air-cooled engine combines precision engineering with field-proven reliability. The 36 cc displacement (2.20 cubic inches) and ringed cylinder design support sustained high-RPM operation while maintaining efficient fuel consumption on a 20:1 gasoline-oil mixture.
Technical Specifications
• Displacement: 36 cc (2.20 cubic inches)
• Bore/Stroke: 35 mm / 32 mm (1.49 in / 1.26 in)
• Cylinder Configuration: Single, ringed
• Power Output: 3.8 HP
• Operating RPM Range: 1,700 to 9,000 RPM
• Fuel Requirement: Gasoline-oil mix, 20:1 ratio (ethanol-free gasoline recommended)
• Ignition System: Saito 4.8 – 6 V DC, 1,000 mAh minimum battery capacity
• Carburetor: 2-needle Saito gasoline carburetor with low-speed and high-speed adjustment
• Cooling: Air-cooled
• Exhaust: Cast muffler type
• Total Weight: 1,746 g (61.6 oz) with motor, mount, muffler, and ignition
• Engine-Only Weight: 1,389 g (49.0 oz)
• Crankshaft: M8 × 1.25 mm thread, 10 mm step-up
• Mounting Envelope: 124 × 85 × 173 mm (7 × 2.625 × 6.3125 inches)
– Key Features
• Pumped carburetor design ensures consistent fuel delivery across the RPM band
• Dual-needle adjustment enables precise idle and cruise tuning
• 4.8 – 6 V ignition system operates with on/off switch rated 3 amps minimum
• Benchmark propeller: APC 18 × 6W at 8,300 RPM
– Compatibility & Integration
Propeller Selection:
• 2-blade: 18–19 inches × 8–9 inches
• 3-blade: 20 inches × 8 inches
System Requirements:
• Fuel filter: SAI50109 or HAN143
• Fuel tubing: Gasoline-resistant (Tygon recommended; silicone fuel lines not recommended)
• Motor mount: Rigid, flat mounting surface required
• Ignition battery: 4.8 – 6 V, 1,000 mAh minimum
• On/off switch: 3 amp minimum rating
