columan at125 ex engine problem

[RQ5]

Boy was going to change oil and pulled wrong plug on bottom of engine has a long spring plunger with holes in it but a hole on one end different and maybe a black plastic cap like and he does not know how it goes any help greatly appreciated or a digram

[Mudflap]

That's the cam chain tensioner. Same as the horizontal Honda engines. There are diagrams on Google that show how it goes together.

[J4Fun]

Originally Posted by RQ5

Boy was going to change oil and pulled wrong plug on bottom of engine has a long spring plunger with holes in it but a hole on one end different and maybe a black plastic cap like and he does not know how it goes any help greatly appreciated or a digram

Black cap in first then small side of spring then plug. Hope this helps