Check the primary resistance (from the input tab to ground, should be ~0.5 to 1.5 Ohms) and secondary resistance (from the input tab to the interior of the spark plug cap, should be ~6k to 10k Ohms). 6. Comprehensive Troubleshooting Guide Probable Cause Corrective Action Engine Will Not Start (No Spark) Faulty kill switch / shorted wiring Disconnect the Black/White wire at CDI to isolate. Fouled or improperly gapped spark plug Clean, gap, or replace the spark plug. Failed CDI module or Ignition Coil Test resistance values; replace component if out of spec. Engine Will Not Start (Has Spark) Clogged pilot jet in carburetor Disassemble carburetor and clean out all jets. Stale or contaminated fuel Drain fuel tank and float bowl; refill with fresh gasoline. Low engine compression
Check fuel lines for kinks; clean or replace the inline fuel filter. Air leak at intake manifold
Let the oil drain completely. Clean any metallic debris off the magnetic drain plug tip. Reinstall the drain plug and torque to .
Adjust the mixture screw or clean out dirty carburetor jets. Restricted fuel delivery 152fmh engine service manual
JASO MA or MA2 certified 4-stroke motorcycle oil.
Start the engine and let it reach operating temperature. Turn the idle screw until the engine idles around 1,500 RPM. Turn the air/fuel mixture screw in or out by 1/4-turn increments until you find the highest, smoothest idle speed. Readjust the idle speed screw down if the idle raises too high. 4. Top-End Disassembly and Rebuild
Adjust while the engine is warm until the engine idles smoothly at roughly 1500 RPM without stalling or engaging the automatic clutch. 5. Electrical System & Wiring Diagram Check the primary resistance (from the input tab
In layman's terms, the is a clone of the legendary Honda Cub (C90/C100) and the Honda Wave 100/110 series. You will find this engine in Skyteam, SSR, TaoTao, Icebear, and countless no-name pit bikes.
The 152FMH is typically paired with a . Performance issues are almost always caused by clogged internal jets. Standard Carburetor Settings Pilot Jet (Idle Jet): #32 - #35 Main Jet: #75 - #82
Face marks (e.g., "R" or "T") must point UP. Second Ring (Dark/Scraper edge): Face marks must point UP. Fouled or improperly gapped spark plug Clean, gap,
Avoid "Haynes" or "Clymer" manuals that cover 1970-1990 Honda bikes. While helpful, they miss the electric starter and CDI specific to the modern 152FMH.
7–10 ft-lbs (9–13 Nm) with blue thread locker . Flywheel Nut: 30–35 ft-lbs (40–48 Nm).
Before diving into the manual, you must understand what you are working on. The code "152FMH" is not random; it is a standardized Chinese engine code.