Zedder Enterprises Zedder Enterprises

71 F81M "250C"

Kawasaki Part Cross Reference Software contains information for this bike.
Need photo Model Identification
Color Lime Green
Frame serial # F81-00001 - ?
Engine serial # F81E00001 - ? found on LH top crankcase below air intake housing.
Cylinder Mark 246CC found on LH side
Engine Type 2 stroke, single cylinder, rotary disc valve, air cooled.
Displacement 246cc
Bore X Stroke 68.0 X 68.0 mm
Compression Ratio 7.5:1
Maximum HP 27 at 6750 rpm
Maximum torque 3.12 kg-m at 5750 rpm
Carburetor Mikuni VM30SS
Lubrication System Premix gasoline & oil
Transmission Ignition System Rotor magneto
Clutch Type Wet, multi-disc, Manual Ignition Advance Fixed
Transmission 5-speed, constant mesh, return shift Crankshaft Rotation Counterclockwise from ignition (LH) side
Shift Pattern 1-N-2-3-4-5 bottom up (w/neutral finder) Cylinder Material Aluminum alloy with ferrous sleeve.
Gear ratios 1st 2.45 (27/11) Fuel Min 95 Research/90 average oct, mixed 20:1 gas:oil
2nd 1.60 (24/15) Oil 2-stroke racing oil for air cooled engines
3rd 1.26 (24/19) Tuning Specifications
4th 1.09 (25/23) Engine
5th 0.95 (19/20) Cylinder Head Torque Nuts Cross-tighten : 4.0 kg/m
Primary Ratio 3.04 (73/24) Bolts Cross-tighten : 2.2 kg/m
Final Ratio 3.21 (45/14) Compression Pressure 13.0 kg/cm² STD 9.0 kg/cm² service limit
Overall Ratio (top gear) 9.29 Spark Plug NGK B9HCS or B9HS 0.6 mm gap
Chassis Ignition Timing 19° BTDC (2.35mm) - Set point gap, install dial indicator, and turn stator plate to adjust timing.
Wheelbase 1390 mm Point Gap 0.35 ± 0.05 mm
Ground Clearance 230 mm Air Screw 1¼ turns out
Dry Weight 108 kg Idle Speed Engine stops at closed throttle or lowest stable rpm
Fuel Tank Capacity 12.5 liters Transmission Oil SE Class SAE 10W30 or 10W40
Tire Size Front 3.00-21 4PR Tube-Type - Capacity 1.0 liter
Rear 4.00-18 4PR Tube-Type - Level Motorcycle vertical, off side stand, wait 5 min, between lines on dipstick, screwed in all the way.
Brake Type Front Mechanical Drum (Leading/Trailing) Chassis
Rear Mechanical Drum (Leading/Trailing) Fork Oil SAE 10W
Brake Size Front 150 X 28 mm - Capacity 175 cc dry
Rear 150 X 28 mm - Level 451 ± 4 mm (Fork extended, spring installed)
Suspension Stroke Front 175 mm (Hatta fork) Tire Pressure Front 1.00 kg/cm² cold, change for course & rider preference
Rear 100 mm Rear 1.00 kg/cm² cold, change for course & rider preference
  Drive Chain Slack About 25 mm (motorcycle vertical, tightest point, STD)

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Zedder Enterprises

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