Must be rated JASO MA or JASO MA2 for wet clutches.
Before turning a wrench, verify your engine code. The code is typically stamped into the lower left side of the crankcase, near the gear shifter. Decoding the Engine Code 1 : Single cylinder 52 : 52.4mm cylinder bore F : Air-cooled by natural airflow M : Motorcycle/powersports engine H : 110cc displacement class Key Technical Data Engine Type: 4-Stroke, Single Cylinder, OHC, Air-Cooled Actual Displacement: 107cc to 110cc Bore x Stroke: 52.4mm x 49.5mm Compression Ratio: 9.0:1 or 9.1:1
Hold the adjuster screw stationary while tightening the locknut. Recheck the clearance to ensure it did not shift during tightening. Oil Change and Screen Cleaning
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Wet multi-plate (Available in Automatic, Semi-Automatic, or Manual configurations) Transmission: 4-speed (usually N-1-2-3-4 or 1-N-2-3-4) Fluid Capacities Engine Oil Capacity: 0.8 Liters (approx. 0.85 US quarts)
Hold the adjuster screw stationary while tightening the locknut.
Allow the engine to cool completely. Disconnect the battery or spark plug wire to prevent accidental start-up. Drain Fluids: Must be rated JASO MA or JASO MA2 for wet clutches
Check the level without screwing the dipstick in; the oil should sit halfway up the crosshatched section. 3. Routine Maintenance & Tune-Up Intervals Maintenance Task Interval (Hours/Miles) Specification / Action Every 10–15 hours / 500 miles Replace with 10W-40 JASO MA Valve Clearance Check Every 20–30 hours / 1,000 miles Intake: 0.05mm / Exhaust: 0.05mm Spark Plug Inspection Every 20 hours / 800 miles Gap to 0.6mm – 0.7mm Air Filter Cleaning Every 10 hours (more if dusty) Wash foam filter, re-oil Cam Chain Adjustment Inspect if engine ticking Auto-tensioning (check hydraulic spring) Valve Clearance Adjustment (Tappet Setting)
Following these guidelines will maximize the lifespan of your 152FMH engine. Always maintain clean oil, clean air filters, and correct valve clearances to ensure thousands of hours of trouble-free performance.
Improper valve clearance causes hard starting, loss of power, and potential engine damage. Check clearances every 20–30 hours of operation. Specifications Intake Valve Clearance: 0.05mm (0.002 in) Exhaust Valve Clearance: 0.05mm (0.002 in) Step-by-Step Adjustment Decoding the Engine Code 1 : Single cylinder 52 : 52
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What are you experiencing (e.g., hard starting, smoky exhaust, bogging under acceleration)?
Unbolt the three bolts securing the cam sprocket, remove the sprocket, and suspend the cam chain with a piece of wire so it doesn't drop into the bottom case.