I've tore this thing down probly 6-7 times top and bottom, no matter what I do I still get 6spi. Im thinking worn parts maby? Timing is good the arrows line up, take up lever at the top, feed dogs all the way forward. Pressure feet have the same lift, and middle foot reaches material at the same time as the needle. Stitch length indicator on 5 does 6spi, stitch indicator on 6 does 6 spi, indicator on 7 does 7 ect,ect .
sews great, just at 6 spi or shorter