Tight intake valve (no clearance holding the valve open slightly) or lean idle mixture.
Your engine will reward you with a lifetime of steady, thumping reliability. Don’t guess—torque it by the book.
This manual is far more than a collection of diagrams and torque specifications; it is the definitive authority on the engine’s anatomy, behavior, and longevity. It serves three critical roles: a diagnostic tool, a procedural guide, and a preserver of engineering tolerances.
: Remove the spring and the wire mesh oil strainer screen behind the drain plug. Clean out any metallic debris with brake cleaner. 162fmj Engine Service Manual
Because the 162FMJ is an OHV pushrod engine, the thermal expansion of the long metal rods changes valve lash dramatically as the engine heats up. Setting correct clearances when the engine is is critical for performance and component longevity. Valve Clearance Specs (Cold) Intake Valve: 0.05 mm (0.002 inches) Exhaust Valve: 0.08 mm (0.003 inches) Step-by-Step Adjustment Procedure:
⚠️ Some so-called “162FMJ manuals” are poorly translated. Always double-check torque specs and clearances with Honda Wave 125 data.
Inspect carburetor jets for blockages. Ensure the pilot screw is adjusted correctly. Tight intake valve (no clearance holding the valve
Based on common CG150/162FMJ configurations, the specifications are:
: Valve clearance too tight (valves staying slightly open, losing compression). Fix : Check and adjust valve clearance to 0.05 mm. Cause : Choke cable broken or misadjusted. Fix : Verify the choke butterfly valve closes fully. Issue 2: Blue Smoke from Exhaust Cause : Worn valve guide seals or worn piston rings.
Regular maintenance is crucial for the longevity of pushrod engines. This manual is far more than a collection
Run a compression test. If below 100 PSI (7 Bar), perform a top-end overhaul. Replace compression rings, scraper rings, and Viton valve stem seals. Issue 3: Hard Starting or Popping through Carburetor
Turn the fuel/air pilot screw slowly inward (clockwise) until the engine RPM begins to drop or stumble.
The 162FMJ typically utilizes a PZ27 or standard 27mm slide carburetor. 14 mm to 15 mm
Remove the cylinder to inspect for scoring or wear ( Piston Rings: Replace rings if excessive smoke is present. Clutch Replacement Side Case: Remove the right-side engine cover.
After a crash or a seized bearing, you need to check the crankshaft. The manual states maximum allowable runout (typically less than 0.05mm).