FYI ALERT FOR GRAVES Cam chain Tensioners !
I just received my Graves cam chain tensioner and noticed that the lock nut would not bottom down against the tensioner body.
I emailed Graves tech support and promptly received this reply, please see the copy of the emails below .
Hi
I recently purchased one of your cam chain tensioner Part #: CMY-13R1-PCT from Revzilla to be installed in my 2014 Yamaha SuperTenere.
Many other SuperTenere owners on Yamahasupertenere.com have installed this unit on their bikes, haven't heard of any issues there.
The o-ring supplied with this unit does not compress enough to allow the locking nut to bottom out onto the tensioner body, after torquing the nut down, there remains .004 in. space under the nut, either the o-ring section thickness is too large or the machined relief in the tensioner body is insufficient . I substituted a 3/8" ID x 1/16" section O-ring and seems to fit much better, allowing o-ring compression and the nut bottoming to the tensioner body.The supplied O-ring appears to be about 11/32" ID and about 1/13" section . Can you give me an explanation of these findings ?
Thank you,
Rod Mitchell
Good afternoon Mr. Mitchell,
Thank you for your feedback. We are constantly improving our products based off customer input and ongoing R&D. I have looked into our CMY-13R1-PCT product line. Here is what I found.
The correct O-ring is as you stated 3/8 ID X 1/16 “ .
All remaining kits are correct( We must have received a bad O-ring in the last batch)
I can send you a replacement O-ring at no charge if you would like.
Thank you for your time and consideration.
Jim (JJ) Matter
Production / Operations Manager
Graves Motorsports