Posts: 56
Joined: 4/18/2017
Location: Tucson, AZ USA
I have more play than I would like in the lower shock bushing/upper swingarm bushing.
The lower shock and upper swingarm bushings seem worn. There is too much play. The bolt is in good condition. The bushings dont seem to be a replaceable Yamaha part? Does anyone sell bushings? or rebuild the shock and swingarm bushings? I've cleaned them up and lubed them with waterproof grease, for now...get a bit of a 'clunk' when I jump the bike...
Posts: 3303
Joined: 3/21/2014
Location: Saratoga Springs, NY USA
I have an NOS shock bushing from a 79 full size YZ... Check part #"s & see if they are the same, I paid 50.00, will sell for 25.00 plus shipping. 
Posts: 23625
Joined: 4/1/2008
Location: USA
I see they have the swing arm pivot kit available here. Might call and see if they have a fix for the upper.
http://www.x-tremevintageyz.com/products#!/All-Balls-Swing-Arm-Bearings-kits/p/20566201/category=4784701
Posts: 23625
Joined: 4/1/2008
Location: USA
Posts: 56
Joined: 4/18/2017
Location: Tucson, AZ USA
Posts: 56
Joined: 4/18/2017
Location: Tucson, AZ USA
Edited Date/Time:
newmann wrote:
I see they have the swing arm pivot kit available here. Might call and see if they have a fix for the upper.
http://www.x-tremevintageyz.com/products#!/All-Balls-Swing-Arm-Bearings-kits/p/20566201/category=4784701
Thx...my swingarm pivot bearings and collars are good...The worn bushings are in the upper swingarm where the bottom of the shock attaches/ pivots...I can see a bushing in there...but doesn't show up on parts list...
I'll call as you suggest...
Posts: 56
Joined: 4/18/2017
Location: Tucson, AZ USA
sandman768 wrote:
I have an NOS shock bushing from a 79 full size YZ... Check part #"s & see if they are the same, I paid 50.00, will sell for 25.00 plus shipping.
Ahh...I tried to correlate the '79 lower shock bushing number, but I can't. The '78 parts diagrams do not show it as a replaceable part. The '79 parts diagram shows the replaceable part....but it looks a bit different, to me.
I'm no expert...the '78 and '79 lower shock bushings look different to me in that photo.?
Maybe...the answer is to use a '79 shock in the '78 chasis so it is rebuildable? Does a '79 shock fit in a '78?
Posts: 3303
Joined: 3/21/2014
Location: Saratoga Springs, NY USA
Edited Date/Time:
I'm sure someone on here knows the answer to the 78-79 shock upgrade, I am not sure...my vast knowledge of useless vintage information is limited to Suzuki"s. Mine may be the upper bearing, I bought both for my 79 yz400 & only replaced 1 of them, I remember I had to visit a friend to use his press to replace it, I thought the shock was going to break, it came out so hard....if it is a serviceable part try Speed & Sport Yamaha in PA, that is where I got all my NOS YZ parts
Posts: 56
Joined: 4/18/2017
Location: Tucson, AZ USA
Edited Date/Time:
Thx...I'll be patient...I can't be the first with this question and this forum group seems very experienced.
It looks like the same issue with that upper swingarm bushing...it shows up as a replaceable part #38 in the '79 swingarm diagram (bottom), but is not shown in the '78 diagram. So, again, if the bushings are the same...then I can rebuild a '78 upper swingarm with '79 bushings....or I have to get a '79 swingarm to have it rebuildable if its compatible with a '78 chassis...? Kinda the same questions.
Posts: 2164
Joined: 8/15/2006
Location: NJ, USA
My guess is that the 78 and 79 suspension parts are different dimensions. The 77 and 78 would interchange
