My Clutch Cylinder Valve Went? - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 15 (permalink) Old 08-15-2011, 07:34 PM Thread Starter
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My Clutch Cylinder Valve Went?

Well, I put on new levers and noticed some weird play on the clutch side and a co-worker pointed out I was blowing bubbles into my reservoir every time I pulled the clutch in. On closer inspection there was a tear on the boot for the button that pushes in the valve into the master cylinder. I've got a "rebuild kit" on the way, but has anyone else run into this issue? I thought it was kind of weird and it's kind of a heads up if any of you feel your clutch lever is feeling funny.
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post #2 of 15 (permalink) Old 08-15-2011, 09:52 PM
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The boot you mention is just to keep contamination out.
You have air bubbles in your lines probably due to a worn cup seal and O-ring on the master cylinder piston.

It can happen to anyone when they wear enough.
I've had the same happen to clutch and brake master cylinders on my cars.
The repair kit should correct the problem.

Just be sure and keep everything clean, and don't drip any brake fluid on paint or plastics.
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post #3 of 15 (permalink) Old 08-16-2011, 12:04 AM Thread Starter
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Yeah, I've bled my lines a couple times since I bought it (I know it's not necessary to bleed the lines so often) and wondered why the feel got so weird. I rushed the order so I'm hoping I'll be getting the rebuild kit tomorrow at work. My co-worker said it could leave me stranded so it has me a bit worried. However, I'm quite happy with the Titax levers I got. I still wish I had the option of a long clutch lever, but I really like having a short brake lever which is more important anyways.

And forget my plastics, I plan on getting new ones over the winter. I bought my bike knowing little about plastics and bodywork stuff and now realize the plastics on my bike are craptastic.

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post #4 of 15 (permalink) Old 08-16-2011, 12:45 AM
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SubSailor has you covered there. that boot was torn on mine too. A new one came in the rebuild kit. The reason you are seeing bubbles is because one of the cups on the inner piston is torn enough to allow air thru. And it def can leave you with no way to dis-engage. It happend to me. At a traffic light. In fact, I had several traffic lights to negotiate to get the bike home. no bueno.

I would take the slave cylinder off too and inspect those cups/seals. Since the one's on your master are going out...

John, 2000 RC51 #000100

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post #5 of 15 (permalink) Old 08-17-2011, 10:13 PM Thread Starter
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So I put the new piston/spring w/ the new seals n' stuff into the master cylinder and now my clutch line won't bleed. Any suggestions?

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post #6 of 15 (permalink) Old 08-17-2011, 11:09 PM
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With the overhaul of the master cylinder, you're gonna have a lot of air in the system.
Does the master cylinder seem like it's trying to pump fluid?
There's not much to the system, but getting all the air out can be a pain.

One thing we tried with my brother-in-law's goldwing, was squeezing the lever and securing it in that position over night.
The air bubbles collected and we were able to bleed them out.

Some bikes have bleed screws at the master cylinder and slave cylinder ends.
I think that would have been a great idea for this time as well.
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post #7 of 15 (permalink) Old 08-17-2011, 11:11 PM Thread Starter
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It doesn't really seem like it's doing anything at all. Did you leave the bleed valve open or closed when you left the lever squeezed overnight?

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post #8 of 15 (permalink) Old 08-17-2011, 11:16 PM
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Quote:
Originally Posted by raylee View Post
It doesn't really seem like it's doing anything at all. Did you leave the bleed valve open or closed when you left the lever squeezed overnight?
The bleed valve was closed.
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post #9 of 15 (permalink) Old 08-17-2011, 11:22 PM Thread Starter
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I got this weird feeling that I messed something up with the rebuild, but I followed the diagram in the repair manual exactly, hell, I just did it just the way that weird drill-looking thing, rubber grommets and spring came out of the cylinder. Anyways, I've got the lever tied down and the system closed so I hope it works in the morning.

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post #10 of 15 (permalink) Old 08-17-2011, 11:26 PM
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Were you getting any leakage at the master cylinder?
And did it feel like it was trying to pump or apply pressure to the system?
If all else fails, you may need to disassemble the master cylinder again to inspect what might be the problem.
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