Slack in clutch lever - air - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 14 (permalink) Old 08-31-2014, 01:40 PM Thread Starter
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Lightbulb Slack in clutch lever - air

I seem to have developed some slack in the clutch lever, manifesting in a clutch engagement point far too close to the clipon.

Bleeding from the clutch slave didn't help. I traced it to air in the reservoir end of things. I managed to get the air out by adding some now low fluid and pumping the lever. All good now at this time.

Since it slowly manifested over time I wonder if it may come back. I'll have to wait and see. I did some searching here and there is a rebuild kit with seals. Any thoughts?
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post #2 of 14 (permalink) Old 08-31-2014, 02:03 PM
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If you have the reservoir topped off and you get more air into the system, you need to rebuild the master.

Based solely on your description, you may have not bled the slave long enough to get all the air out, and that may be something that you still need to do. If you are very careful, you can also bleed some at the top banjo, just be careful that you keep the fluid away from paint and plastic.
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post #3 of 14 (permalink) Old 08-31-2014, 10:07 PM
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I just bled mine and had to do it for quite a while to get all the air out at the first banjo bolt, just doing it at the clutch housing end isn't enough if there is air in the master, does it leak at all anywhere?...

Has just realized that I don't care what it costs until I get the bill! :roll eyes: ...

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post #4 of 14 (permalink) Old 08-31-2014, 11:25 PM
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Do yourself a favor and pull the slave cylinder off as well and give it a good claening. They get gunked up and start causing issues. Mine was pretty bad when i pulled it apart. Depending on how everything looks, may be worth it to replace all the seals and gaskets.

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post #5 of 14 (permalink) Old 09-01-2014, 02:45 AM
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When did you renew the fluids last?


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post #6 of 14 (permalink) Old 09-01-2014, 11:54 AM Thread Starter
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Clutch fluid was replaced in spring.

The slave is fine. I double checked with a rebleed when diagnosing the issue.

No visible leaks anywhere that I can see.

Topping off the reservoir is difficult. It is at such a steep angle with the tilt of the clipon (to get the levers facing at a comfortable angle downwards). The actual fluid line is at a very different angle than the full/empty lines on the reservoir. It does look like by bouncing around that it could draw in some air because of that, but IDK

I had some bad caliper seals on on the bike when I had it. So it maybe needs a rebuild too.

I guess the only way I will be able to tell is over time. If it is air ingress it is slow, as in weeks. Unless you have other thoughts.
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post #7 of 14 (permalink) Old 09-01-2014, 05:34 PM
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When you're topping off the bottle, you should lose the bolts that hold the master and turn the steering so that the bottle's cap is as much parallel to the ground as you can. After tightening the cap, you can adjust it back to the position it fits you the best.

It would be a good idea to pull the slave's piston out and check the seals. Not that hard of work like the calipers. Starting on the easy, to inspect, end, if it checks out ok, then you disassemble the master.

When you put the piston on the slave back in, pour some fluid inside first and then push the piston in so that fluid is pushed in the bottle. Makes the bleeding wayyyyyy more easier


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post #8 of 14 (permalink) Old 09-01-2014, 11:25 PM
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^^^ what he said.... Loads easier than doing it cockeyed.

Has just realized that I don't care what it costs until I get the bill! :roll eyes: ...

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post #9 of 14 (permalink) Old 09-02-2014, 09:33 PM
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I can add a couple things, I've had some bleeding issues too.
As you already suspect, maybe your master cups/orings are beginning to give out a little.
I'm betting you already figured out about turning the handlebars to the appropriate position, but after that, I've had to follow the line downwards and make sure there are no high spots in the rubber line that connects to the hardline. That one drove me batty till i figured it out.
Have you detected any sign of leaks around the master?

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post #10 of 14 (permalink) Old 09-03-2014, 10:41 AM Thread Starter
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No leaks detected.

Ya, I've always done the basics to fill the reservoir. Still, I went back and made the extra effort to fill it more a few days back.

As mentioned, I fixed the slack by working on the reservoir end. Now I have to see if it comes back. The bike wasn't being ridden much at all when the slack appeared. But imo it could have happened either from an improperly low reservoir that let air air when I used it, or a slow ingress of air from worn MC components (seals). I guess time will tell.
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