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Common 4 Stroke Problems:
 

Ignition System Components (Inactive Link)

 

Fuel System Components (Inactive Link)

 

Compression and Internal Components (Inactive Link)

 

Valve Train Components (Inactive Link)

 

Timing

 

Won't Start  

X

 

X

 

X

 

X

 

X

   
Hard to Start  

X

 

X

 

X

 

X

 

X

   
Kick's Back When Starting  

 

 

 

 

       

X

   
Starts But Dies Right Away  

 

 

X

 

             
Runs But Dies When Hot  

X

 

X

 

             
Runs Rough At Idle  

X

 

X

 

 

           
Runs Rough Under A Load  

X

 

X

 

 

           
Engine Smokes (White/Gray)      

X

 

X

           
Engine Smokes (Black)  

X

 

X

               
Engine Surges  

X

 

X

             

X

Runs Too Fast      

X

             

X

Runs Too Slow      

X

             

X

Lacks Power  

X

 

X

 

X

 

X

 

X

 

X

Backfires Through Carb      

 

     

X

 

X

   
Backfires Through Exhaust  

X

 

X

               
Leaks Fuel      

X

               
Uses Excessive Fuel  

X

 

X

               
Has Fuel In Crankcase      

X

               
Loud Pop When Engine Dies  

X

 

X

               
Leaks Oil      

X

               
Uses Excessive Oil      

X

 

X

           
                         
Other Problems:                        
Loud Squealing Noise                        
Excessive Vibration      

 

               
                         

 
 

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