[Coodeville]

I was using 207 thread and my tension was fine. Now I've gone back to 92 and the tension is off.

I'm thinking that the big difference in size requires a tension adjustment.

[DanTwoLakes]

You are thinking correctly. Another thing about larger size thread..........you don't need to loop it through the thread guide on the top of your machine, just run it straight through from back to front. That is probably why going to smaller thread threw your tension off. The bigger thread had more tension on the top thread if it was looped through the top thread guide.

[Coodeville]

Ok, I fixed that problem. now this is what happened next. I changed the needle from a 24 with 92 thread to a 20 with 92 thread and the tension went off. The 24 and 92 combo worked fine. Once I put a 20 in - kapoot!

[DanTwoLakes]

The difference in needles will not make any difference in the tension. When you change the thread you need to make sure you have the thread pulled into the middle of the tension disks for the top thread tension. If you don't, the tension will be off until the thread is completely seated between the disks.