When I press start button nothing happens. I have replaced the starter battery and solenoid When I touch the two post together on solenoid it cranks but doesn't start. I replaced the spark plug also. But if I bump start it it runs like a champ. Any help would be appreciated

 

Well of course I would have said check the battery and spark plug but you already replaced those. Stating the obvious, you have a problem with your electrical system. Without seeing it, there is no way of me knowing what the problem is. Could be a connection problem of a burnt up wire