: Exploded diagrams or photographs showing the rocker arms and adjustment screws to help DIYers avoid common mistakes. Unofficial Royal Enfield Community Forum - Index Other Key Content Areas Maintenance Schedules
Using the manual's feeler gauge spec, slide the gauge between the valve stem and rocker arm. Loosen the locknut, turn the adjuster screw until you feel slight drag, tighten the locknut, and re-check. The manual emphasizes "Cold engine only."
Turn the idle speed screw (centered on the throttle slide) to achieve a stable idle between 1,400 and 1,600 RPM.
The manual lists the stock cam lift (usually 5.0mm). If you want more power, you can source a "race cam" (6.5mm lift), but the manual warns that exceeding the valve spring coil bind limit (found in Section 3) will destroy the engine.
A high-quality service manual for this engine is typically between 80 and 150 pages. It is divided into logical chapters. When searching for a PDF or physical copy, ensure it contains these ten critical sections: 162fmj Engine Service Manual
Check your oil immediately. Lack of oil will cause catastrophic overheating.
Standard clearance is 0.010–0.040 mm. A clearance greater than 0.10 mm requires a top-end rebuild.
The engine—commonly referred to as the CG150 or CB150 in various markets—is a highly popular, air-cooled, single-cylinder, 4-stroke engine . Found globally in a wide variety of 150cc commuter motorcycles, dirt bikes, and ATVs, it is revered for its robust reliability, vertical cylinder orientation, and mechanical simplicity.
Understanding the factory specifications is critical before attempting any measurement or repair work. General Dimensions & Capacities : Exploded diagrams or photographs showing the rocker
is the engine showing (e.g., smoking, weird noises, electrical faults)? What is the make and model of the motorcycle or ATV?
Drain the engine oil. Remove the exhaust pipe, carburetor, spark plug, and upper engine mounting brackets.
Change every 1,000–2,000 km (initially, then every 2,000-3,000 km thereafter). Use 15W/40-SE or 10W-40 4T motorcycle oil. Valve Clearance: Check/adjust every 2,000–3,000 km.
162FMJ Engine Service Manual: Complete Maintenance & Repair Guide The manual emphasizes "Cold engine only
Gently turn the pilot screw clockwise until lightly seated, then back it out 1.5 to 2.25 turns as a baseline. Tune for the highest, smoothest idle. 4. Engine Disassembly & Component Inspection
| Specification | Value | | :--- | :--- | | | Single-cylinder, 4-stroke, air-cooled, manual clutch | | Displacement | 149.4 ml (commonly known as a 150cc) | | Bore x Stroke | 62 mm x 49.5 mm | | Compression Ratio | 9.0:1 | | Max Power | ~8.5 kW (11.4 hp) at 8500 rpm | | Max Torque | ~11.0 N·m at 7500 rpm | | Ignition System | CDI (Capacitor Discharge Ignition) | | Starting System | Electric starter and/or kick-starter | | Lubrication | Pressure and splash lubrication | | Transmission | Manual 5-speed (pattern: 1-N-2-3-4-5) |
This service manual provides the essential specifications, maintenance procedures, and troubleshooting steps required to keep your 162FMJ engine running at peak performance. 1. Engine Specifications & Technical Data