Don't worry about the diaphagm. If it would be torn you would not get anywhere near 4500 rpm. The spring loaded damper is a little pin on the reverse side of the float valve needle. The float valve needle comes as one and if you replaced it it should be fine. If the damper in the needle is stuck a good wash of the needle with carb cleaner usually does the job.
Make sure you have the correct spark plug.
Make sure your air filter is clean and intact.
Also clean the carb nicely as they accumulate a lot of gunk around the diaphagm and slide over the years.
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