🏷️ Basic Information Identification Make: Sea-Doo Model: Challenger 1800 Year: 1999 Generation: Pre-Gen 📋 Manual Details Description Manual Type: Factory Service Repair Manual Language: English Page Count: Hundreds Format: PDF Availability: Downloadable ⚙️ Engine Specifications Engine 1 Engine Type: Rotax 787 RFI Displacement: 787cc Configuration: Inline 2-Cylinder Fuel Induction: Rotax Fuel Injection (RFI) Cooling System: Open Loop Water Cooling 🔧 Transmission Drive System Type: Direct Drive Jet Propulsion Reverse: Yes (Electronic) 📐 Dimensions General Length: 18' 0" (5.49 m) Beam: 7' 6" (2.29 m) Height: 4' 0" (1.22 m) (approx.) Dry Weight: 1650 lbs (748 kg) (approx.) 🔧 Maintenance Engine Oil Oil Type: 2-Stroke Synthetic Oil Oil Capacity: N/A (Premix or Oil Injection) Spark Plugs Recommended Spark Plugs: NGK BR9EG or equivalent 📄 Capacity Fuel Fuel Capacity: 35 US Gallons (132 Liters) Passengers Passenger Capacity: 7 📄 Hull Construction Hull Material: Fiberglass Hull Type: Deep-V