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View Full Version : Dammit. Cam chain lock nut



bonesxl1100
03-26-2013, 3:17 PM
Putting the xs650 engine back together and can't find the damn lock nut for the can chain tensioner. Anybody know what size it is? Wonder if I'll have luck finding something thatll work at the hardware store. Just usually something that size is also pretty thick and I may not be able to fit the cover over it.

Jetblack
03-26-2013, 5:37 PM
Which nut are you meaning? My guess is #18 pictured below but not really sure...

http://webservices.motorsportdealers.com/parts/partImages/YAM/2/MCY/1973/XS1_XSB_XS2_TX650/IMAGES/CAM_SHAFT_-_CHAIN_TENSIONER.Gif

bonesxl1100
03-26-2013, 5:41 PM
16

bonesxl1100
03-26-2013, 5:43 PM
To be honest. I don't even remember taking it off. I'm wondering if it was ever on there at all since I've owned it.

Jetblack
03-26-2013, 5:48 PM
I would carry #15 in there and find one that fits...easiest way I know of.

bonesxl1100
03-26-2013, 6:00 PM
Yeah that's what I'm gonna have to do and hope it fits in there. The walls are a little tight. I could always grind down whatever nut I find that works if needed. Man that'll be a pain.

Jetblack
03-26-2013, 6:10 PM
Then you carry #18 too...screw "NEW #16" on #15 a little and if it slides into #18 which is a sort of gauge for that hole size...you're golden.

Make sure to leave #18's o-ring home so you don't lose it.

bonesxl1100
03-26-2013, 6:13 PM
Duh

Thanks dude. Sometimes you need another person to point out the obvious. :o

Jetblack
03-26-2013, 7:21 PM
No worries sometimes the solution is apparent but not exactly obvious. ;)

bonesxl1100
04-01-2013, 6:08 AM
Turns out from 76 to 78 they didnt use a lock nut. Before 76 and after 78 they did. Yamaha must have realized the error in their ways.

Blackbetty
04-01-2013, 8:37 AM
With the exception of type A and type B commonly found on the earliest XS's, there's no mechanical advantage in one style over the other.

http://i1020.photobucket.com/albums/af327/bmwbobz/Engine/TensionerID.jpg

bonesxl1100
04-01-2013, 10:51 AM
Yeah I've got type d. Ok, I thought I was missing it till I researched more.

davidabl
04-02-2013, 2:15 PM
Yeah I've got type d. Ok, I thought I was missing it till I researched more.

Good, I had been wondering if it'd fallen somewhere inside the engine,,,,

Jetblack
04-02-2013, 7:51 PM
Gotta love it when they can't make up their mind on a part and keep reinventing the wheel... especially when none work better than any of the previous.

It appears the lock nut model has an O-ring behind it, then the cap nut seats onto the lock nut with an O-ring. I am glad that mystery got solved.

bonesxl1100
04-03-2013, 5:14 AM
And also thanks for that pic blackbetty. It doesn't get any clearer than that. I feel better now. Thought I was going crazy not remembering taking a lock nut off.