Thank you for contacting the AnswerARMY.
It is upsetting that you have had these concerns.
While the sound is not normal it is most commonly caused by a low octane fuel. I would ask that you try 91 or 93 octane fuel mixed with Husqvarna Low-Smoke oil. This has been noted before, while most of our equipment runs fine on 87 octane fuel the use of 91 or 93 is preferred in the "0" series of blowers. High octane fuel mixed with correct oils should cause the noises to subside. Most likely this is spark knock just like you might get in a high performance automobile when used with low octane fuel.
Thank you for contacting the AnswerARMY.
It is upsetting that you have had these concerns.
While the sound is not normal it is most commonly caused by a low octane fuel. I would ask that you try 91 or 93 octane fuel mixed with Husqvarna Low-Smoke oil. This has been noted before, while most of our equipment runs fine on 87 octane fuel the use of 91 or 93 is preferred in the "0" series of blowers. High octane fuel mixed with correct oils should cause the noises to subside. Most likely this is spark knock just like you might get in a high performance automobile when used with low octane fuel.