162fmj Engine Service Manual | iOS |

The 162FMJ engine is a ubiquitous 150cc single-cylinder, four-stroke, air-cooled powerplant, often referred to as the

Remove the piston pin clip using needle-nose pliers, push out the wrist pin, and remove the piston. Inspection and Measurements

Slide a feeler gauge between the tip of the valve stem and the rocker arm adjusting screw.

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Because the 162FMJ is an OHV engine, thermal expansion impacts the long pushrods significantly. Incorrect valve clearances cause hard starting, loss of compression, or excessive tapping noises. Step 1: Locate Top Dead Center (TDC) 162fmj Engine Service Manual

Inspect the guide play. If valves leak or show pitting, lap them back into the seats using valve grinding compound. Reassembly Tips

: Conduct a compression test. If wet compression test yields significantly higher PSI than a dry test, replace the piston rings and hone the cylinder. Issue 3: Loud Metallic Tapping Noise Cause : Excessive valve clearance or worn pushrods.

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.

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. The 162FMJ engine is a ubiquitous 150cc single-cylinder,

The 162FMJ is a popular model of small-displacement, single-cylinder engine mass-produced in China. It’s the heart of countless motorcycles, ATVs, go-karts, and three-wheelers around the world. The "162FMJ" designation is a code that reveals its basic specs:

Pull out one circlip, slide the wrist pin out, and remove the piston. Inspection Limits

: Remove the right-side crankcase cover. Remove the three screws on the oil filter cap. Wipe out the trapped sludge inside the rotor housing.

Single-cylinder, 4-stroke, air-cooled, OHV (Pushrod). Displacement: 149.4cc. Bore x Stroke: 62.0 mm × 49.5 mm. Compression Ratio: 9.2:1. Cooling System: Natural air cooling. Starter System: Kick starter and/or electric starter. Service Clearances & Tolerances Intake Valve Clearance (Cold): 0.05 mm (0.002 in). Exhaust Valve Clearance (Cold): 0.05 mm (0.002 in). Spark Plug Gap: 0.6 mm – 0.7 mm. Engine Oil Capacity: 0.9 Liters (1.0 Liter at disassembly). Because the 162FMJ is an OHV engine, thermal

Because the 162FMJ typically does not use a paper oil filter, it relies on a internal centrifugal filter and a wire mesh screen. Change the oil every 1,000 to 1,500 kilometers (approx. 600 to 900 miles).

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

Complete engine 150cc 162FMJ 150 4T AC (zetka 150) - Motor-X

Insert a 0.05 mm feeler gauge between the valve stem and the rocker arm adjuster screw.