Article [13] ST1300 - Clutch Slave Cylinder Replacement

I bled my clutch this morning on my #2 ST1300 and yesterday I took my frame off the engine on my #3 ST.
So no hijack to this clutch thread. ;)
Bike was stripped down to just the engine and frame, oil pan was sitting on concrete on a piece of plywood.
All it took was 2 hands, super easy to pull the frame straight up.
Frame is off to the recyclers, any one want it.? Easy to carry with one hand, 30lbs if that.
Engine has 66,000 miles on it, exhaust pipes internals were squeaky clean telling me this engine is like brand new.
Anyone need an engine?
 

Attachments

  • IMG_0271.jpg
    IMG_0271.jpg
    113 KB · Views: 18
MaxPete said:
Agree with Igofar and Suprasabre and another trick I have used (see the article) is to stick the fluid banjo fitting & copper crush washer “sandwich” together with some petroleum jelly (the stuff we used to use on baby’s bums when changing diapers).

It is sticky as heck so it is easy to line everything up before you try threading in that bolt - and if any gets into the brake fluid, it won’t cause any harm and will likely come out when you bleed the system.

The other key thing is: check the threads on the end of the bolt VERY carefully to make sure they are not misformed and that there is no burr that could prevent a smooth engagement of the bolt into the tapped hole.

One thing is for sure - after all the work of doing this job you do not want to strip or cross-thread that banjo bolt.

Pete
Click to expand...
Thank you for that
let you know how it goes
 
Well gents love all the input. It's been a great read. I'm a newby to the forum and had tackled the CSC and master cylinder rebuild before becoming a member. Youtube was a great help but not as good as here. Would have bought the OEM CSC instead of the kit had I'd known the difference. To my chagrin my clutch keeps failing. A little background - when I took my bike out of storage this summer found I had no clutch pressure and noticed a wet spot on cardboard that I had placed under the bike. After some research determined the CSC needed to be replaced so bought the CSC and MC kits and went to work. After bleeding the lines (used one of those vacuum pumps from PA) figured all was well so took out for a test run. Did someone mention the fun of pushing one not these monsters home! Got about 20km and lost my clutch. Came to an intersection stopped, down to !st gear let out on clutch lever, nothing but revving engine!! Got the bike back to the garage (lucky I have a truck and ramps plus found an incline to load) did another bleed. This time figured had good brake fluid flow and pressure at the lever so good to go. Did a few short runs in my neighbourhood today but noticed clutch engaging was fading. Got back home to check for leaks. All seemed good. Tried pumping clutch a few times which seemed to help and was about to head out again when clutch wouldn't engage with lever fully extended. Pumping lever seems to help as got enough cutch to ride bike back in garage. Some have suggested bleeding line at banjo bolt at MC but that would be messy as well as at banjo bolt on CSC. Going to try another bleed with some vibration as some have suggested. Also BTW - rather than Honda GN4 oil used Castrol GTX SAE 10W-40 if that might make a difference as read some hard shifting with oil change. Any and all suggestions welcomed. So much for retirement and freedom to roam, lol.
 
AidanJ said:
Well gents love all the input. It's been a great read. I'm a newby to the forum and had tackled the CSC and master cylinder rebuild before becoming a member. Youtube was a great help but not as good as here. Would have bought the OEM CSC instead of the kit had I'd known the difference. To my chagrin my clutch keeps failing. A little background - when I took my bike out of storage this summer found I had no clutch pressure and noticed a wet spot on cardboard that I had placed under the bike. After some research determined the CSC needed to be replaced so bought the CSC and MC kits and went to work. After bleeding the lines (used one of those vacuum pumps from PA) figured all was well so took out for a test run. Did someone mention the fun of pushing one not these monsters home! Got about 20km and lost my clutch. Came to an intersection stopped, down to !st gear let out on clutch lever, nothing but revving engine!! Got the bike back to the garage (lucky I have a truck and ramps plus found an incline to load) did another bleed. This time figured had good brake fluid flow and pressure at the lever so good to go. Did a few short runs in my neighbourhood today but noticed clutch engaging was fading. Got back home to check for leaks. All seemed good. Tried pumping clutch a few times which seemed to help and was about to head out again when clutch wouldn't engage with lever fully extended. Pumping lever seems to help as got enough cutch to ride bike back in garage. Some have suggested bleeding line at banjo bolt at MC but that would be messy as well as at banjo bolt on CSC. Going to try another bleed with some vibration as some have suggested. Also BTW - rather than Honda GN4 oil used Castrol GTX SAE 10W-40 if that might make a difference as read some hard shifting with oil change. Any and all suggestions welcomed. So much for retirement and freedom to roam, lol.
Click to expand...

Hi Aidan:

It sounds to me as though you still have an internal leak - either in the master or the slave.

If you rebuilt the slave - I'd start there. I am a mechanical engineer and a specialist in hydraulics. When I started this whole clutch slave cylinder shindig several years ago, I decided that for the paltry difference in cost (I think that a rebuild kit was around $60 CAD and a new OEM slave cylinder was around $90 CAD at the time), it wasn't worth the risk of trying to rebuild an old, corroded, and totally worn-out component. Sure enough, the inside of my CSC was an absolute mess and I doubt that a rebuild would have worked for very long. Others on this thread have generally found the same thing - the old CSC's are generally shot by the time they really fail.

If you haven't done anything to the master cylinder, then I'd replace that component too - as an internal leak there will display the same symptoms as a leak in the slave.

Anyhow - stick at it and you will get there.

BTW - I just completed a nearly 8000 km ride from my home in SW Ontario to the Maritimes and a superb tour of Newfoundland on my '83 BMW R100RS. The tour was organized by ST Owners member @Jim C-G, who operates the "Old Guy on a Bike" YouTube channel - and we had a ball! There were seven riders plus Jim following along in his car (he had electrical problems with his trailer connections on the bike) - and the weather was remarkable. Fortunately, we departed on the Argentia ferry juuuuust before the wildfires got going.

Feel free to fire questions - but please don't talk about engine oil. That topic makes my head hurt!

Pete
 
MaxPete said:
Hi Aidan:

It sounds to me as though you still have an internal leak - either in the master or the slave.

If you rebuilt the slave - I'd start there. I am a mechanical engineer and a specialist in hydraulics. When I started this whole clutch slave cylinder shindig several years ago, I decided that for the paltry difference in cost (I think that a rebuild kit was around $60 CAD and a new OEM slave cylinder was around $90 CAD at the time), it wasn't worth the risk of trying to rebuild an old, corroded, and totally worn-out component. Sure enough, the inside of my CSC was an absolute mess and I doubt that a rebuild would have worked for very long. Others on this thread have generally found the same thing - the old CSC's are generally shot by the time they really fail.

If you haven't done anything to the master cylinder, then I'd replace that component too - as an internal leak there will display the same symptoms as a leak in the slave.

Anyhow - stick at it and you will get there.

BTW - I just completed a nearly 8000 km ride from my home in SW Ontario to the Maritimes and a superb tour of Newfoundland on my '83 BMW R100RS. The tour was organized by ST Owners member @Jim C-G, who operates the "Old Guy on a Bike" YouTube channel - and we had a ball! There were seven riders plus Jim following along in his car (he had electrical problems with his trailer connections on the bike) - and the weather was remarkable. Fortunately, we departed on the Argentia ferry juuuuust before the wildfires got going.

Feel free to fire questions - but please don't talk about engine oil. That topic makes my head hurt!

Pete
Click to expand...
To funny. It was the "Old Guy on a Bike video's that I used along with a few others for reference. Wow, that was quite the ride!! We've had a pretty hot summer. The wild fires though have been extreme. A lot of homes and beautiful country destroyed. Thanks for the advice. Just of the phone with my local Honda One dealer and ordered a new CSC, gasket and crush washers. Parts should be in late next week. Will let you know how I make out!!
 
You must log in or register to reply here.
Back
Top Bottom