model 4262 is surging

[mnmax]

I have a lawn boy 4262 that is surging I,m not sure I have the air vane set properly and where the spring attaches.

I have not been able to locate a service manual to look at how it should be indexed and connected.

Any insight would be helpful.

Thanks

 

[impalass]

Here is a picture of the spring connection. One end connects to the lever and the other end connects to the collar thru the square hole.

https://lookup3.toro.com/Ill/1x/5/5745/8088059B.gif

 

[mnmax]

Thanks for the help.