[MonkeyBiker]

Hello! I'm getting crazy not being able to drive my Z50J 73cc The problem is i adjust the cam chain so it lines up with the dot and the flywheel perfectly. After 10 minutes driving it starts going slowl and i feels it has no power, because the cam chain is somehow jumping teeth on the cam sprocket That means the piston starts hitting the valves. I've tried replacing the cam chain and guides with the 50cc ones, still same problem. I'm thinking it could be a problem with the tensioner spring or both the cam chains are worn? Anyone else had any problem like this? Thanks for help!

 

[davmo]

The chain tensioner is a good place to start. You need to also check your oil pump drive sprocket. The chain tensioner uses oil pressure to make it work, and a drop in oil pressure could be the problem. You can take your stator plate off to inspect the sprocket.

 

[MonkeyBiker]

I tried removing the bolt holding the spring, a little amount of oil came out. I've watched a video about a guy explaining the tensioner. He's saying that if you drain the oil from there you need to refill it like this: (Check at 2:51).

But how i understand it the oil-pump should fill that by itself? I put new oil and it seemed to have fixed it, do i have to concearn about anything or is that guy in the video right?