Harry, I'm trying to think what could rattle on an M15 while motoring. One thing you could do to check the centerboard would be to raise or lower it and see if the noise changes. Also, you could pull up on the centerboard pendent with a steady pressure and hold it there, and see if the noise changes. It is normal for the centerboard to have some play in the centerboard cavity. Pulling up on the pendent would take-out most of the play. On our M15 I recall the adjustable motor mount and boarding ladder also had some rattle to them. It seems like the vibration of the outboard at low engine speeds (especially a 4-stroke) would rattle most anything rattleable. I often raise or lower the motor speed slightly to take out some of the vibration echoing through the boat. Randy G. ________________________________________ From: montgomery_boats-bounces+randyg=cite.nic.edu@mailman.xmission.com [montgomery_boats-bounces+randyg=cite.nic.edu@mailman.xmission.com] On Behalf Of Harry & Nancy [nanarry@shaw.ca] Sent: Wednesday, August 15, 2007 11:51 AM To: montgomery_boats@mailman.xmission.com Subject: M_Boats: M15 vibration noise Hi M15 owners: When motoring with my M15, there is a loud vibrating noise{racket}. I've tried to locate its origin but no luck. Could it be the centerboard rattling? Thanks for any clues. Harry Elmslie _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats