2025 Honda Grom (MSX125) Factory Maintenance Schedule & Service Punch-List

Scheduled Maintenance Punch-List & Service Estimator

Engine Oil & Filter Element Replacement

• Drain Plug Torque: 43 N·m (31.7 ft-lb)
• Always install a fresh OEM aluminum crush washer (M12/M14)
• Pre-lube new filter O-ring with fresh engine oil prior to spin-on install
• Warm engine to operating temperature before draining for complete sediment evacuation

Spark Plug Inspection / Direct-Replacement

• Tightening Torque: 13 N·m (9.6 ft-lb)
• Hand-thread plug completely down to cylinder head seat before applying torque wrench
• Inspect electrode coloration for stoichiometric AFR balance (tan/light grey)
• Apply thin film of dielectric grease to interior of coil-on-plug boots

Brake Fluid Full Hydraulic Flush & De-Aeration

• Bleeder Nipple Torque: 6 N·m (Do not over-torque aluminum threads)
• Hygroscopic degradation: brake fluid absorbs atmospheric moisture; discard if moisture > 3.7%
• Flush master cylinder reservoir completely before cycling ABS hydraulic modulator
• Wash painted/plastic bodywork immediately with clean water if fluid contact occurs

Rotor Thickness & Pad Friction Lining Inspection

• Front Caliper Mounting Torque: 30 N·m
• Minimum friction material thickness: 1.0 mm (excluding steel backing plate)
• Check rotor surface for deep grooving, heat bluing, or radial thermal stress cracks
• Verify caliper slide pins are free of corrosion and lubricated with silicone grease

Drive Chain Slack Inspection, Adjustment & Lube

• Clean chain with O-ring safe chain degreaser; do not use harsh solvents or wire brushes
• Measure chain slack at midpoint of lower run; adjust to 20-30 mm tolerance
• Torque rear axle spindle nut: 150 N·m
• Apply synthetic high-adhesion chain wax/lube to interior run of rollers

Engine Air Intake Filter Element Service

• Remove fuel tank / side fairing panels to access airbox cover screws
• Inspect airbox lower cavity and drain hose for blowby oil condensation
• Do not blow compressed air through viscous paper filter elements (destroys filtration matrix)
• Verify airbox lid seal is properly seated to prevent unfiltered dust bypass

Engine Cooling System Flush & Radiator De-Aeration

• Only open radiator cap when engine is completely cold (ambient temperature)
• Drain coolant from water pump drain bolt and radiator lower hose connection
• Flush cooling circuit with distilled water before filling with fresh 50:50 HOAT coolant
• Cycle engine until radiator fan activates, then burp cooling jacket to eliminate air pockets

Valve Clearance Inspection & Camshaft Timing Audit

• Strict requirement: engine must be cold (temperature <= 35°C / 95°F) for accurate readings
• Rotate crankshaft to compression Top Dead Center (TDC) for each cylinder firing order
• Shim Diameter: N/A (Screw & Locknut Tappet)
• Replace valve cover gasket and spark plug well O-rings upon reassembly

Chassis, Axle & Safety Critical Fastener Audit

• Front Axle Pinch Bolts: 23 N·m (Tighten alternately twice)
• Front Caliper Mounting Bolts: 30 N·m
• Check triple clamp pinch bolts, handlebar clamps, and footpeg brackets
• Inspect steering head bearings for notchiness or play at center-detent

Workshop Tool & Chemical Pre-Flight Card

Compare authorized dealership retail service invoicing against performing scheduled maintenance in your private shop.