A model number would help us be more specific. Basic are turn on the ignition, push primer 6X, full choke and full throttle the pul the strater rope. If it fires but doesn't start then you open the choke and pull again.

Model number 536.886120.

Thanks

For some reason Sears doesn't like that number http://www.searspartsdirect.com/partsdirect/part-model/model+536.886120?pathTaken=partSearch&prst=0&shdMod=model+536.886120 Maybe you can give it a try. The instructions I did give start my 5hp blowers every time