Yamaha RD 350 F2 '88 - Part 5 - Rear suspension linkage maintenance

I did some small maintenance jobs while I had my bike dismantled and taken to pieces when I was modifying the rear frame. One of those jobs was to replace worn bushings, collars and seals from the rear suspension linkage with new ones. After cleaning and dismantling the linkage I found one corroded collar (part #: 90387-144H4), one worn bushing (90386-20134) and punch of broken oil seals (93109-20076 & 93109-18020).

Since my RD is quite old I had to purchase replacement collar and bushing from eBay where you can find a nice collection of NOS (New Old Stock) parts for sale. Common parts like oil seals I try to buy from my local store which sells industrial products. Most of the common sized bearings and oil seal are usually in stock so you don't have wait for them. This time I wasn't able to find the right sized oil seals for the linkage arm so I ordered them from my local Yamaha parts dealer. Dimensions for linkage arm oil seals (93109-20076) are 20 x 27 x 5 mm and drop link oil seals (93109-18020) 18 x 24 x 3 mm.

After getting all the right parts it was just a matter of greasing them with multipurpose grease and putting back together.

Parted rear suspension linkage.

NOS collar (90387-144H4) and bushing (90386-20134).

New oil seals for linkage arm (93109-20076)...

... and drop links (93109-18020).

Old versus New (Old Stock).

Maintaining front fork - Suzuki T250J

I decided to start this project by maintaining the old stock front suspension. First thing do to was to disassemble the front shocks.

Disassembled Suzuki T250J front shocks.

Each shock has two different size O-rings and and one oil seal which I replaced with these ones:

- 2 pieces Oil seal 34 x 46 x 10,5 mm
- 2 pieces O-ring NBR 70 39,20 x 3,00 mm
- 2 pieces O-ring NBR 70 21,82 x 3,53 mm.

I also bought some new fork oil. I added 1,90 deciliters of fork oil to each shock.

Set of O-rings and oil seals for Suzuki T250J front shocks. 

Seals in place. Oil seals came with some own lubricant.

Last thing to do was to put the shocks back together.

Suzuki T250J front shocks back together.