Problem related to 4-stroke Honda GX 35 engine

[ankitsingh]

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.

 

[rawlyold]

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.