Ok, started the tear-down of the top end on the 07 RM125.
A few things I was disappointed with regarding the Suzuki "top end kit" 12100-36871:
1. Does not contain a new Wrist Pin
2. Does not contain a new piston/rod bearing
3. Does not contain new power valve cover gaskets
I am going to assume here that the wrist pin and piston rod bearing are items that really should be replaced during a top end rebuild? I included a pic of the wrist pin I have. As you can see, shows signs of some wear.
How much side-side play is allowed on the connecting rod with the head off? Mine has quite a bit!
As I stated before, I never did a two stroke top end, I have done my fair share of modern 4stroke rebuilds. I was expecting to see carbon buildup all inside the powervalve assembly and a bunch of gunk. Not so here, besides the I guess normal oil/premix. Nothing was carboned up here. I was unable to remove the two 4mm allen head screws (you can see them in my pics). They are super tight and I ended up bending my allen wrench trying to get them off. I will have to buy a allen socket for this but I'm wondering if it's even necessary (there is no binding or obvious signs of issues within the movement of the valve).
I included a pic of the powervalve shaft. There is some wear from where the two springs rest on it.... should this be replaced?
Cylinder looks great.
Any other tips are greatly appreciated! Here are the pics:
Before a simple Cleaning:
After a simple Cleaning:
The grooves on powervalve shaft I was referring to from where the two springs rest on it:
Wrist Pin: