Back stitching

[Moti]

Hi

What can cause my back stitches the look bad, because my forward stitches is very good 

help plz

its happened on two machine 

Consew 206rb-1 and seiko stg-8dlb-3

Edited 9 hours ago by Moti

[AlZilla]

We are going to need pictures.  You need to be very precise in how you backstitch because this bigger thread we typically use looks messy quick.

Definitely a quick picture of what you're calling "bad", please.

.

[Moti]

I will try to do some pic maybe tomorrow 

and a very good technician told me that the tension is different between forward and backward stitching I didn’t know that

it most be away to fix it and we try to sew 207 thread with 23# needle that is also not good he said we need needle 24# for this thread and this machine not designed for this big thread 

[Hildebrand]

I have pretty much quit stitching backward.  To backstitch when I start, I turn the piece around so I am sewing forward toward the starting point, I usually try to mark about 3 stitches out, then when I get to the starting point I turn the work around and still sewing forward go back over the 3 starting stitches and sew it the rest of the way, when I get to the end I again turn the piece around and backstitch 3 stitches sewing forward along the stitch line.

Todd

[AlZilla]

1 hour ago, Moti said:

I will try to do some pic maybe tomorrow 

and a very good technician told me that the tension is different between forward and backward stitching I didn’t know that

it most be away to fix it and we try to sew 207 thread with 23# needle that is also not good he said we need needle 24# for this thread and this machine not designed for this big thread 

If you're sewing a few stitches, reversing and then sewing forward again, you're running over the same stitches 3 times. That is going to be messy. Plus the needle hole isn't going to accommodate 3 threads. On my big 441 clone, I start a few stitches from the beginning, reverse 3 holes and then stitch forward again. This gives me 2 locked stitches with 2 threads each. You could try this or follow Hildebrands method, which is how we do it on machines without reverse.

I think this is likely your problem. I'd double check that the machine likes that 207 thread. My 111Ws cap out at 138.

How about they bobbin thread? What size are you using there?