| Specification | Value |
|---|---|
| Production Years | 1983 – 1985 |
| Engine Type | 194cc Liquid-Cooled 2-Stroke |
| Transmission Oil | SAE 10W-30 (0.9 L) |
| Spark Plug | NGK BR8ES (Gap: 0.7–0.8 mm) |
| Battery | YB3L-A (12V) |
| Front Tire | 2.75 – 21 45P |
| Rear Tire | 4.10 – 18 59P |
The Honda MTX 200 RW (MD07) occupies a pivotal position in dual-sport history as one of the first production trail bikes to implement Honda’s ATAC (Automatically Controlled Torque Amplification Chamber) system. This mechanical exhaust valve technology was a precursor to the more complex power valves seen in later CR motocrossers, specifically designed to broaden the powerband of the 194cc liquid-cooled engine by varying the exhaust volume at low RPMs.
Engineering Overview
Introduced in 1983, the MD07 was Honda’s response to the growing demand for high-performance, road-legal enduro machines. Unlike its air-cooled predecessors, the RW (Real Water-cooled) variant utilized a sophisticated cooling circuit that allowed for tighter tolerances and more consistent power delivery under heavy load. The chassis featured Pro-Link rear suspension, which offered progressive damping that was significantly more advanced than the dual-shock setups of the era.
Maintenance Specifications
For the preservation of the MD07’s high-revving 2-stroke engine and its unique transmission, adhering to exact fluid and ignition tolerances is critical.
Lubrication and Fluids
The transmission requires 0.9 liters of SAE 10W-30 oil. For optimal clutch performance and gear protection, MotoSpecsLab recommends using an oil meeting API SE or SF standards. Given the age of these components, modern synthetic oils with friction modifiers should be avoided to prevent clutch slippage.
Ignition and Electrical
The ignition system relies on an NGK BR8ES spark plug. To ensure efficient combustion and prevent fouling—a common issue in ATAC-equipped engines—the gap must be precisely set between 0.7 and 0.8 mm. The electrical system is supported by a standard YB3L-A battery.
Chassis and Tires
The MTX 200 RW maintains its off-road pedigree with a 21-inch front and 18-inch rear wheel configuration. Proper tire pressure is essential for both rim protection and traction:
- Front (2.75 – 21): 1.5 bar (22 psi)
- Rear (4.10 – 18): 1.5 bar (22 psi) for solo riding; 1.8 bar (25 psi) when carrying a passenger.
The MotoSpecsLab Verdict
The Honda MTX 200 RW remains a masterclass in 1980s engineering. While the ATAC system requires periodic cleaning to prevent carbon buildup, the MD07 offers a level of mechanical character that modern dual-sports often lack. For collectors and enthusiasts, maintaining the liquid-cooling system and using the correct NGK heat range are the keys to longevity for this classic 2-stroke machine.