Many backyard mechanics argue, “It’s just a Honda clone; use a CG200 manual.” While the 162FMJ is derived from the Honda CG engine architecture, the Chinese manufacturing tolerances, bolt grades, and oil passage designs differ significantly.
This flow-chart section is gold. It guides you through:
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. 162fmj Engine Service Manual
Disassembly of the two-piece crankcase. The manual warns against prying the cases apart—they are sealed with anaerobic gasket maker (like Threebond 1184). You must use a rubber mallet and specialized pullers.
An engine service manual is a comprehensive guide provided by the manufacturer or a third-party publisher that details the specifications, maintenance procedures, troubleshooting tips, and repair instructions for a specific engine model. For a "162fmj" engine, this manual would be crucial for mechanics, technicians, and anyone interested in performing maintenance or repairs on this engine. Many backyard mechanics argue, “It’s just a Honda
Many riders convert the 162FMJ to a 183cc (Moderate) or 212cc (Extreme). Using the manual's cylinder stud spacing (typically 62mm center-to-center), you can determine if a 67mm piston will fit. The manual’s coolant jacket depth tells you how much you can safely bore.
Using the manual’s troubleshooting section, here is how to solve the top three complaints about this engine: If you want more power, you can source a "race cam" (6
| Symptom | Likely Cause (Per Manual) | Repair Reference (Page #) | | :--- | :--- | :--- | | Hard starting hot | Intake valve clearance too tight (0.00mm gap). | Valve adjustment section. Set to 0.06mm Intake, 0.08mm Exhaust. | | Knocking on deceleration | Connecting rod big end bearing wear. | Crankcase split procedure; measure rod side play (0.3mm max). | |Oil leaking from breather tube| Overfilled oil or collapsed piston ring. | Compression test (min 120psi). Ring replacement section. | | No spark after storing | Stator trigger coil corrosion. | Ignition coil resistance test. Replace if less than 150 Ohms. |
Detailed diagrams of the OHV rocker arm assembly. This section shows you how to remove carbon deposits from the combustion chamber without damaging the 62mm bore cylinder walls.