Honda CRF50F Owner's Manual page 171

Initial Maintenance about 100 miles (150 km) or 1 month.
Regular about every 600 miles (1,000 km) or 6 months.
Maintenance
Pre-ride Inspection Check the following items each time before you ride (page
leaks, engine oil, fuel, drive chain, cables, nuts & bolts, spark plug & cap, throttle, and
brakes.
Fuel/Capacity unleaded gasoline, pump octane number of 86 or higher
tank:
reserve:
Engine Oil API Service Classification SG or higher except oils labeled as energy conserving on the
circular API service label, SAE 10W-30, JASO T 903 standard MA,
Pro Honda GN4 4-stroke oil or equivalent
Maximum Weight 88 lb (40 kg)
Capacity rider only (no passenger or cargo) and any accessories
Tires Front:
Type:
Tire Pressure (cold) Front:
Rear:
Spark Plug CR6HSA (NGK)
0.69 US gal (2.6 )
0.18 US gal (0.7 )
2.50-10 33J 2.50-10 33J
, Rear:
bias-ply, tube
15 psi (100 kPa , 1.00 kgf/cm )
18 psi (125 kPa , 1.25 kgf/cm )
or
U20FSR-U (DENSO)
Quick Reference
27 ): tires, spokes & rims,
Quick Reference