how to remove noise from elna 8300?

Your problem is very common & due to lack of servicing.If you remove the plastic bobbin cover & the bobbin & look into the bobbin case you will see a small hole in the metal bobbin case base.Apply a few drops of sewing machine oil into the hole & by hand turn the machine in REVERSE,6 turns should do the trick.Run the machine with no thread at high speed for a few minutes to allow the oil to work it's way in.It is vital for the machine that you oil this spot on a weekly basis.

Sewman
May 2011

You need to check to make sure the motor has not come loose first of all then take out the bobbin case completely and check to make sure there is no thread stuck there.

ken
April 2011