u/blandondarsh

Finally getting around to tearing this ZA50 engine apart. Would love somebody to help me with a couple of questions..

1. When pulling this apart it looks like there is some form of jb weld. Any ideas as to why this is there? Obviously a shot in the dark but figured it would be worth asking
2. While disassembling the head the mounts came off. When I go to reattach them should I loctite them?
3. What’s up with the look of the piston? Thoughts?

Overall I’m teaching myself as I go.

I was given this alongside a bike I purchased. I have no clue what model it is, or if it would work with my za50 engine. Is it even worth considering using?

Been learning the hard way and digging into this motor and have questions…

I want to test for spark using the drill method on the flywheel. I see the arrow is pointing to the left, however when I try to run it to the left the flywheel nut backs out. I stopped and re tightened this nut down but before I go forward I would love somebody to talk me through this specific part. Do I go right? Some guides online said follow the arrow so now I’m a little confused

Also.. I took a picture of a part on the engine but have no clue what this part does. This screw, what does it all do?

Thank you all in advance for your help.