4-speed semi-automatic (no clutch lever) or 4-speed manual Ignition: CDI (Capacitor Discharge Ignition) Spark Plug: NGK CR7HSA or C7HSA (or equivalents) 2. Fluid and Lubrication Specifications

Raise the carburetor needle clip or install a larger main jet. Clogged air intake Clean or replace the foam air filter element. Worn piston rings Replace piston rings and hone the cylinder bore. Failed valve seals

Adhering to a strict maintenance schedule prevents premature wear of the valvetrain and piston rings. Maintenance Item Interval (Hours / Miles) Specification / Action Every 15–20 Hours / 500 Miles 15W-40 or 10W-40 MA/MA2 (approx. 700–800ml) Valve Clearance Check Every 30 Hours / 1,000 Miles Intake: 0.05mm / Exhaust: 0.05mm (Cold) Spark Plug Inspection Every 20 Hours / 500 Miles Clean soot, check gap (0.6mm–0.7mm), replace if eroded Air Filter Cleaning Every 10 Hours (or after muddy rides) Wash foam filter in solvent, dry, apply fresh rim oil Oil Screen Cleaning Every 50 Hours / 1,500 Miles Remove right crankcase cover, clean internal oil mesh Oil Change Procedure:

Run the engine for 3-5 minutes to warm the oil.

Black/Red (Source Coil): Should read between 300–500 Ohms.

Warm up the engine for 3 minutes to thin the oil, then shut it off.

Place the top piston ring 10mm into the cylinder bore using the piston to square it. Measure the gap with a feeler gauge. Service limit: 0.50mm . Reassembly & Ring Orientation:

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152fmh Engine Service Manual Repack Jun 2026

4-speed semi-automatic (no clutch lever) or 4-speed manual Ignition: CDI (Capacitor Discharge Ignition) Spark Plug: NGK CR7HSA or C7HSA (or equivalents) 2. Fluid and Lubrication Specifications

Raise the carburetor needle clip or install a larger main jet. Clogged air intake Clean or replace the foam air filter element. Worn piston rings Replace piston rings and hone the cylinder bore. Failed valve seals 152fmh engine service manual

Adhering to a strict maintenance schedule prevents premature wear of the valvetrain and piston rings. Maintenance Item Interval (Hours / Miles) Specification / Action Every 15–20 Hours / 500 Miles 15W-40 or 10W-40 MA/MA2 (approx. 700–800ml) Valve Clearance Check Every 30 Hours / 1,000 Miles Intake: 0.05mm / Exhaust: 0.05mm (Cold) Spark Plug Inspection Every 20 Hours / 500 Miles Clean soot, check gap (0.6mm–0.7mm), replace if eroded Air Filter Cleaning Every 10 Hours (or after muddy rides) Wash foam filter in solvent, dry, apply fresh rim oil Oil Screen Cleaning Every 50 Hours / 1,500 Miles Remove right crankcase cover, clean internal oil mesh Oil Change Procedure: 4-speed semi-automatic (no clutch lever) or 4-speed manual

Run the engine for 3-5 minutes to warm the oil. Worn piston rings Replace piston rings and hone

Black/Red (Source Coil): Should read between 300–500 Ohms.

Warm up the engine for 3 minutes to thin the oil, then shut it off.

Place the top piston ring 10mm into the cylinder bore using the piston to square it. Measure the gap with a feeler gauge. Service limit: 0.50mm . Reassembly & Ring Orientation: