need opinons on ignition timing problem

[Tom N]

I was checking to make sure my igntion timing was set properly today and found it not to be. problem is when I remove the tps and stab the gas a few time and get it into timing mode it will idle about 900 rpms which is close enough but to get it to 15 degrees i have to turn the cas all the way clockwise. I cant even adjust it to more than 15-16 degrees.

I double checked timing marks and they seem correct when at tdc. Any ideas why I have to turn the cas all the way to the right to get 15 degrees.

Edit to add motor is a S15 sr20det

http://i481.photobucket.com/albums/rr179/tnoonen/sr20mechanicaltiming2_zps4ab89c82.jpeg (http://s481.photobucket.com/user/tnoonen/media/sr20mechanicaltiming2_zps4ab89c82.jpeg.html)

http://i481.photobucket.com/albums/rr179/tnoonen/sr20mechanicaltiming1_zps9413ab6b.jpeg (http://s481.photobucket.com/user/tnoonen/media/sr20mechanicaltiming1_zps9413ab6b.jpeg.html)

http://i481.photobucket.com/albums/rr179/tnoonen/sr20mechanicaltiming_zpscb401f52.jpeg (http://s481.photobucket.com/user/tnoonen/media/sr20mechanicaltiming_zpscb401f52.jpeg.html)

[Croustibat]

Same answer as on the CA, timing chain out one tooth.

[Tom N]

Same answer as on the CA, timing chain out one tooth.

Same answer as on the CA?

Wouldn't these marks not line up properly if it was out one tooth?