🏷️ Basic Information Identification Make: Suzuki Model: DF90/100/115/140 Generation: N/A (Refers to a range of models) 📋 Manual Details Availability Manual Type: Service/Workshop Manual Language: English (Assumed, typical for such manuals) Format: PDF Download Content Source: Workshop ⚙️ Engine Specifications General Engine Type: Four-stroke Cylinder Configuration: Inline 4-cylinder Displacement Df90: 1502 cc (91.7 cu.in.) Displacement Df100: 1502 cc (91.7 cu.in.) Displacement Df115: 1870 cc (114.1 cu.in.) Displacement Df140: 1870 cc (114.1 cu.in.) Performance Power Df90: 90 HP (67.1 kW) Power Df100: 100 HP (74.6 kW) Power Df115: 115 HP (85.8 kW) Power Df140: 140 HP (104.4 kW) Fuel Induction: Multi-point Sequential Electronic Fuel Injection Ignition System: Fully Transistorized Ignition 🔧 Transmission Gear Reduction Type: Gear Reduction (Forward, Neutral, Reverse) Gear Ratio Df90: 2.42:1 Gear Ratio Df100: 2.42:1 Gear Ratio Df115: 2.38:1 Gear Ratio Df140: 2.38:1 🔧 Maintenance Lubrication Oil Type Recommendation: Suzuki Marine Engine Oil (Specific grade varies by temperature/usage) Oil Capacity Df90 Df100: 4.5 Liters (4.8 US Quarts) Oil Capacity Df115 Df140: 4.5 Liters (4.8 US Quarts) Scheduled Recommended Spark Plug: NGK CR9EDX-9S (or equivalent) Spark Plug Gap: 0.9 mm (0.035 in.)