K Bike Tech

K75 Fork Oil Quantities

Over the K75's production life K75s came with three different forks:

Early: Regular forks
Middle: Fichtel and Sachs "Sport" forks
Late: Model year 1992 and later K75s have Showa forks

Fork Identification:

The regular and sport fork caps look like this under the plastic cap at the top of each fork. The sport forks have an "S" stamped into the fork cap.

Showa forks look like this under the plastic cap.

Fork Oil Quantities (per side):

Fork Type	Drain & Refill	Take Apart & Reassemble
Regular	330 cc
Sport	280 cc
Showa	410 cc	420 cc

Drain & Refill Tips:

FORK OIL: There is no standard for fork oil weight. 10W from one maker may not perform the same as 10W from another maker.

I use Honda SS-8 fork oil which is a 10W fork oil in my Ks and it seems to perform well.

DRAINING: As with any vehicle fluid, it's a good idea to make sure that you can remove the fill plug before draining.

When draining forks it's a good idea to put some aluminum foil over the brake rotors and tire to keep from getting oil on them.

I usually drain each fork into a Pyrex measuring cup to measure how much oil I drain from each fork. It "shoots" out when the drain plug is first removed so it's a good idea to hold the cup up to the hole at first until the draining turns into a dribble.

CAUTION: Do not he-man the drain plugs when replacing them. If you're not careful you can strip the threads in the fork lower. The recommended torque for them is 9 Nm. (80 in-lbs)

FILLING: I use a kitchen syringe for adding fork oil.

Example:

Refill the oil S-L-O-W-L-Y. It takes a while for the oil to seep into the guts of the fork.

The filler plugs just need to be '"snug" since they are sealed by a rubber O-ring. The torque spec is 15 Nm. (11 ft-lbs)