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When you change thread, are you using the same brand of thread and thread weight? A heavier or lighter weight thread will affect the bobbin tension. Otherwise, perhaps the bobbin case is worn. Look for a replacement bobbin case.
Try installing a brand new needle. Sometimes a bent or dull needle will cause lots of racket.
You should consult your owner's manual for maintenance--cleaning and oiling instructions. Most sewing machines do require oil--some more frequently than others. Most machines also need frequent oiling in the bobbin/hook area. Be sure to use only good quality sewing machine oil for your machine--NO 3-in-1, WD-40, cooking oil, or old brown stinky oil.
If it continues to make the noise, you should probably have it serviced. Since it is less than a year old, it might still be covered under warranty, so don't delay.
Be sure you have the proper needle - it is longer than standard needles, plus be sure that you put the needle in from left to right - not...front to back.
Juki TL-98Q
Loading the bobbin into the bobbin case:
Snap in the bobbin case latch, and put the bobbin into the bobbin case so that the bobbin runs clockwise.
Passing the thread through the **** of the bobbin case, continue passing it under the thread tension spring, and pull out the thread open end about 10 cm from the bobbin case.
Insert the bobbin case fully into the hook, and close the bobbin case latch.
You can obtain a copy of the manual in pdf format for free at:
http://www.juki.co.jp/household_en/pism/img/tl98q/download/98qim.pdf
Loopers are probably out of time. I'd suggest calling a good mechanic. This takes some skill and experience to do. As long as the looper tips are not broken, it can probably be retimed within an hours time.
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