Huasheng 142f - Lost Spark plug thread

Discussion in '4-Stroke Engines' started by grummy, Aug 3, 2008.

  1. grummy

    grummy Member

    This happened when I decide to change the stock spark plug with NGK CR7 HSA, too much turn ..duh ...

    Is there any way to make the engine works again? Because since the "accident" I couldn't make the spark plug tight enough on the machine head - no compression.


  2. JemmaUK

    JemmaUK Guest

    Go to an engineering shop and ask them to put a helicoil insert into the head
  3. FYI,the CR5 is the direct replacement. The 7 works but I believe that's a hotter plug.
    I found my CR5's at my local Harley Shop. Any motorcycle shops should have one out there.
  4. Unwanted Stripper!

    Hey, Amigo, Jemma is correct. Your head should be able to be heli-coiled.

    This process is simple, and can be done at home, BUT you must buy the little set which is, Correct sized drill-bit, correct tap, and the little coils (they look like springs).

    NOW though, you must drill the hole accurately, and also not screw up during either the threading, insertion, and locking steps.

  5. stude13

    stude13 Active Member

    fyi--never pull a spark plug from an aluminum head when it is hot.
  6. grummy

    grummy Member

    I'll bring my baby to the motor shop today. Looks like this is the job for the pros.

    Thanks guys.