Back to servicing You missed the vacuum actuator? Right! The red arrow markes the already fixed part. It fell into the gap between the engine and the gearbox and so the flywheel worked like a grinding disk. The edge at the lower picture became canted (red arrow). Besides the damage it still works fine. You can see the correct function if the lever (blue arrow) is pulled back while the engine runs. This part is only needed during cold starting process. As soon as the engine starts running, the choke is opened slightly by the vacuum. If your engine doesen't run fine during cold start process you shoult inspect this part somewhat closer. I have heard about a loosened idle nozzle (yellow arrow), too. If this happenes, your (WARM) engine stops running while being in idle. If the fixing nuts of the carburetor are loosened, your engine might start running irregular (because of leak air). You can see the front nuts marked with green arrows. The two nuts at the back can't be seen at this photo. Proove all nuts around the carburetor except the one marked by the red circle. This one is for adjusting the fuel mixture (smog checking). Inspect the nuts of the exhaust, too. Back to servicing