Need help with '88 K75C master cylinder

Looks like you may need to remove the master cylinder from the handle bar in order to access the reservoir retaining screw from the bottom.

I'll try to take a look at mine (85 K100RT) to see if there is room for a small bent screwdriver to fit.

Otherwise, I'm sure someone with more experience will be along shortly.

Monte

Rall,


Ignore everything you've read from Drakes post. That is from a different bike.


To do anything with your master cylinder, you must remove the master cylinder.

To remove your master:

Remove the screw that holds the switch plate in place. Then slide the switch plate down 1/8" to disengage the tap that is at the top of the switch plate. Remove switch plate.



Remove throttle gear cover (large Phillips screw between master and throttle grip). Gently pry up to lift cover straight up.

Remove two allen head bolts that hold master cylinder to lever perch. slide master cylinder away from perch. Disconnect throttle cable from chain on throttle gear. You can now easily access the screw that holds the reservuoir to the master cylinder.



When reinstalling the throttle tube, make sure to align the line on the throttle gear with the line on the throttle tube to insure proper operation.



Whoever lubed these throttle gears went WAY overboard with the grease!




I would strongly recommmend that you purchase a Clymers manual if you plan on continueing to work on your own bike.

Thanks Lee!

I'll give your instructions a go. I have a Clymer I use regularly, but their instructions on this procedure were very unclear, like their photos!

Thanks again. I'll keep you all posted on my progress.

Keith

Reply

Hey i think for your 88 K75C issue you should refer some technician like man ....

K100rs master cylinder

I too am replacing the master cylinder on my K bike. I have the Haynes manual but
need help on a few issues.
1. disconnect the brake light switch When I did that it wound up like a spring from unscrewing it. How do you reinstall it without twisting it backwards before threading into the unit?

2. I wound up removing the whole thing because I couldn't fish out the master from the unit after removing the two allen screws. Wound up loosing the pinch clamp and still needed to loosen the handlebar pinch bolts to rotate everything to free it up.
So I am replacing the entire unit. I found a black wire with round crimp on the end which I don't know where it came from. Where does it get screwed to?

1. Either wind it backwards before trying to screw it in or disconnect the switch at its plug (about 18" up the wire) screw it in and then replug in. Either way, you should remove the wire ties on the wire before screwing it in and then replace the ties.


2. The eyelet gets attached to one of the master cylinder bolts. It is a ground wire.

Lee,
Thanks so much for the prompt reply!

Joe

K100rs master cylinder

Lee,
Looking at the brake light wire it goes down the rabbit hole along with that ground wire somewhere in front of the gas tank. Lot of bodywork on the rs. Any idea where I should look for the connector? What bodywork needs to be removed? Any guidance would be appreciated.

Thnaks,
Joe

m5k1200rs said:

Lee,
Looking at the brake light wire it goes down the rabbit hole along with that ground wire somewhere in front of the gas tank. Lot of bodywork on the rs. Any idea where I should look for the connector? What bodywork needs to be removed? Any guidance would be appreciated.

Thnaks,
Joe

Click to expand...

I think the only thing tht needs to be removed is the fuel tank. And at that, maybe even just moved rearward several inches. But the tank is not hard to remove.

K100rs master cylinder

PGlaves said:

I think the only thing tht needs to be removed is the fuel tank. And at that, maybe even just moved rearward several inches. But the tank is not hard to remove.

Click to expand...

What's the trick to attaching the throttle cable back onto end of the chain ? Seems like it just pushes the end link back. I don't seem to be able to get enough cable to come out through the grip end to catch the end link.

Hold the throttle wide open at the throttle body. That will allow for maximum cable protrusion at the grip end. Hook up the cable and release the throttle at the throttle body.

Align mark on throttle tube with line on gear as in post #3.