Problem related to 4-stroke Honda GX 35 engine

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SUMMARY

The discussion centers on a problem with the 4-stroke Honda GX 35 engine used in a supermileage vehicle by the Delhi College of Engineering for the Shell Eco Marathon in Malaysia. The issue involves excessive pressure during the compression stroke, leading to thread failures in the pull rope mechanism's cup-shaped component. The root cause is identified as the harder material of the crankshaft affecting the threads. A suggested solution includes loosening the spark plug during initial runs and adding 2-cycle oil to the fuel to aid in breaking in the engine.

PREREQUISITES
  • Understanding of 4-stroke engine mechanics
  • Familiarity with Honda GX 35 engine specifications
  • Knowledge of engine break-in procedures
  • Experience with 2-cycle oil applications in fuel
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  • Research Honda GX 35 engine break-in techniques
  • Learn about the effects of crankshaft material on engine performance
  • Investigate solutions for thread failure in recoil starter mechanisms
  • Explore the use of 2-cycle oil in enhancing engine lubrication
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This discussion is beneficial for mechanical engineers, automotive technicians, and students involved in vehicle design and performance optimization, particularly those working with small engines like the Honda GX 35.

ankitsingh
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this engine is basically the part of supermileage vehicle which is being made by a team of DELHI COLLEGE OF ENGINEERING to participate in Shell Eco Marathon, Malaysia.
Due to some reason, we are getting a higher value of pressure in compression stroke which is continously leading to the failure of threads of the cup shaped component which is itself a part of pull rope mechanism. And the reason behind this is the harder material of the crankshaft and so its threads at the pull rope sided end.
Kindly comment on this situation and help me to find the solution.
thank you.
 
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Ankitsingh:
The problem you are having is likely due to the engine not being fully broken in.
New rings create additional friction to the compression stroke thus adding stress
to the recoil starter mechanism. You might try starting with the plug loosened
slightly; then tighten once running,or adding a ounce of 2cycle oil to one tank
of fuel until the engine is fully broken in might also help.
 

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