[buster73]

Agree the Seine system is a great improvement for the 915 at reasonable cost. Installed mine several years ago and it works reliable and without problems. Really helps to avoid "misunderstandings" especially in a hurry on the track. As stated above, scratchy gears might also have other causes. E.g. make sure your clutch is disengaging properly and you press the clutch all the way down while shifting. Try to slow down a little on your shift speed and give the synchs a chance to work, especially when the tranny is cold. Many other advice on this forum.