| Symptom | Likely Causes | Solutions | | :--- | :--- | :--- | | | No spark, no fuel, low compression | Check spark plug, ignition coil, and CDI unit. Check fuel flow to carburetor. Perform a compression test. | | Engine starts but runs rough / misfires | Dirty carburetor, incorrect valve clearance, spark plug issues | Clean carburetor jets. Adjust valves to 0.05-0.06 mm. Replace spark plug and set gap to 0.6-0.7 mm. | | Engine stalls at idle | Idle speed too low, idle mixture incorrect, vacuum leak | Adjust idle speed screw. Re-adjust idle mixture. Check intake manifold for cracks or loose clamps. | | Loss of power / Poor acceleration | Clogged air filter, worn piston/rings, incorrect ignition timing | Clean or replace air filter. Perform a compression test. Check and set ignition timing. | | Engine overheats | Low oil level, lean air/fuel mixture, riding too hard | Check and refill oil. Check for air leaks and adjust mixture. Allow engine to cool. | | Blue smoke from exhaust | Worn piston rings, valve seal issues, overfilled oil | Replace piston rings and/or valve seals. Drain excess oil. | | Metallic rattling noise | Loose timing chain, worn cam chain tensioner, loose valve adjuster | Replace cam chain tensioner. Adjust valves. Inspect/replace timing chain. | | Transmission issues (hard to find neutral) | Clutch adjustment, worn shift drum, low oil | Adjust clutch cable free play. Change oil with recommended type. Investigate shift mechanism. | | Electrical problems (lights not working) | Faulty stator, damaged wiring, bad ground | Inspect stator for damage (common issue). Check all wiring connections and grounds. | | Vacuum/pressure issues after plug removal | Cam chain tensioner components dislodged, loss of oil pressure | Re-install plunger and spring correctly; avoid removing this plug. |
If the clearance is incorrect, loosen the locknut with a 9mm wrench. Turn the square adjuster screw until the feeler gauge fits perfectly. Hold the adjuster screw firmly in place and torque down the locknut.
When installing new piston rings, correct orientation and gap spacing prevent oil blow-by:
Lubricate the cylinder bore with fresh engine oil. Compress the piston rings gently by hand while sliding the cylinder block over the piston. Set Camshaft Timing: Align the flywheel to the "T" mark (TDC). Take the cam sprocket and loop the timing chain over it. 152fmh engine service manual
The ignition system is a self-contained AC-CDI system, meaning the bike can run even with a completely dead or missing battery (on kick-start configurations). Electrical Component Specifications NGK C7HSA or Torch A7TC Spark Plug Gap: 0.6 mm to 0.7 mm (0.024 to 0.028 inches)
0.05 mm (0.002 in) (Some heavy utility setups prefer 0.07 mm).
152FMH 110cc Engine with fully automatic for Honda C110 Motorcycle and pit bike atv using. | Fully 152FMH Engine Parts List | PDF | Screw | Washer (Hardware) | Symptom | Likely Causes | Solutions |
Fill with of high-quality 4-stroke motorcycle oil formulated for wet clutches (JASO MA/MA2 certified). Do not use automotive oil with friction modifiers, as it will cause the clutch to slip. 3. Valvetrain Adjustment (Setting Valve Clearance)
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If either circuit shows an open loop (infinity) or zero resistance, the stator assembly must be replaced. | | Engine starts but runs rough /
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The semi-automatic clutch adjustment is incorrect. To adjust, loosen the locknut on the right crankcase cover, turn the adjuster screw clockwise one turn, counterclockwise until resistance is felt, then clockwise 1/8 to 1/4 turn. Hold the screw and tighten the locknut.