| Specification | Data |
|---|---|
| Production Years | 1985 – 1989 |
| Engine Oil | SAE 20W-40 (>5°C) / 10W-30 (<15°C) |
| Oil Capacity | 2.1 Liters |
| Tires (Front) | 3.00 – 21 51P |
| Tires (Rear) | 130/80 – 18 66P |
| Spark Plug | NGK DPR8EA-9 |
| Electrical System | Battery-less (Capacitor 20W-81960-A0) |
The Yamaha TT 600 N, specifically the 59X generation, remains a legendary figure in the world of dual-sport and enduro riding. A unique engineering highlight of the 59X was its departure from the street-legal XT 600’s weight; by utilizing a battery-less electrical system powered by a specialized capacitor and a Nikasil-plated cylinder (instead of a heavy iron sleeve), Yamaha managed to shed significant mass, creating a machine that could dominate both desert trails and technical climbs with agility unheard of for a 600cc thumper in the mid-80s.
Technical Engineering Overview
At the heart of the 59X is the air-cooled, 595cc four-stroke single-cylinder engine. Unlike its XT counterparts, the TT 600 N was tuned for a more aggressive power delivery. The 59X is characterized by its long-travel suspension—300mm at both ends—utilizing Kayaba front forks and a Monocross rear system that was specifically valved for competition. The lack of a battery meant the electrical system was minimalist, designed purely to keep the engine running and provide basic lighting, emphasizing the bike’s purpose as a performance-first off-road tool.
Maintenance Guide
Lubrication System
Proper lubrication is critical for the air-cooled 595cc engine. For standard operation above 5°C, SAE 20W-40 is the recommended grade. If operating in colder climates (below 15°C), switch to 10W-30. The total oil capacity is 2.1 liters. Regular oil changes are vital as the air-cooled design places high thermal stress on the lubricant.
Chassis and Tires
The 59X demands specific tire pressures to balance traction and rim protection. For off-road use, 1.0 bar (14 psi) is the standard, while 1.5 bar (22 psi) is recommended for transitional road use or high-speed gravel tracks. The tire sizes are a classic 21-inch front (3.00 – 21) and an 18-inch rear (130/80 – 18), offering a wide selection of modern enduro rubber.
Ignition and Electrical
Since the 59X lacks a battery, the health of the OEM Capacitor (20W-81960-A0) is paramount for light stability and ignition consistency. For the spark plug, use the NGK DPR8EA-9, gapped to factory specifications to ensure reliable starting—a crucial factor for a kickstart-only machine.
Frequently Asked Questions
A: The TT600 59X is lighter, features higher-spec suspension, lacks a battery, and has a more aggressive engine state of tune compared to the road-biased XT600.
A: Ensure the capacitor is securely mounted and the connections are free of corrosion. If the lights flicker excessively at low RPM, the capacitor may need replacement.