Zenoah G25 Engine Maintenance

& Manuals

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Manuals and reference material

Mikuni VM Carburetor Manual in PDF format Stock Kasperwing G25 engine carburetor tuning procedure
Zenoah G25 Manual Buy a Zenoah G-25-B  

 

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Specifications

Model 250CC Engine Notes
TYPE Upright single cylinder (upside down for the k-wing) 2 stroke air cooled
Displacement (cu. in.) 14.78   (242cc)  
Bore x stroke (in.) 2.835 x 2.343      (72x59.5mm)  
Compression Ratio Nominal 10.6 : 1 Effective 6.5:1
Max output 20hp @ 6,500rpm with a test muffler (muff not supplied)
Exhaust gas temp limit Not to exceed 1,022F   (550C)
Cylinder Head Temp. Not to exceed  446F (230C)
Rotating Direction Counter Clockwise from PTO  
Lubrication System Gas oil mix Ratio 25:1
Lubrication Oil Spec High Quality 2 stroke oil Note: don't mix oil types
Gasoline Spec. Regular Automotive higher octane is better
Carburetor Diaphragm type with pump  
Ignition system Breaker point type Flywheel Magneto and ignition coil Newer Models have CDI ignition
Ignition Timing Retarded 6 B.T.D.C. Advanced 21 B.T.D.C
Spark Plug Champion N3  
Net Weight 38.6 lbs. with recoil starter 35.3 lbs. without starter
Dimensions   (LxWxH) 11.81 x 11.57 x 14.84  in.  

 

 

Maintenance Schedule

  Daily checks every 25 hours every 50 hours every 100 hours
Remove foreign matter

x

x

x

x

Check for fuel leakage

x

x

x

x

Check and tighten bolts

x

x

x

x

Check spark plug gap  

x

x

x

Check point gap    

x

x

Clean Carbon from cylinder head/chamber      

x

Check needle bearing at small end of con-rod      

x