General clutch questions - BMW Luxury Touring Community
 
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post #1 of 13 Old Oct 7th, 2012, 8:59 pm Thread Starter
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General clutch questions

Seems there's been a few more threads than normal regarding clutches, and it has me wondering.
What, other than fluid contamination and extensive wear, causes a clutch (in the LT) to slip?
I ask because I replaced my clutch plate, both pressure plates, slave cylinder etc., about 30,000 miles ago, and every now and again I can get the clutch to slip, but just a little. Occasionally I can hammer the throttle in 4th and 5th, and it'll slip. Most times it doesn't. Last time it did it, I just revved the piss out of it and it quit. That sounds like liquid contamination, but I have none.
What else, including installation errors, can cause the slippage?
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post #2 of 13 Old Oct 7th, 2012, 9:25 pm
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Re: General clutch questions

could your clutch master cylinder be sticking - not returning all the way out leaving a bit of pressure in the line - wild guess

Gary
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post #3 of 13 Old Oct 7th, 2012, 10:16 pm
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Re: General clutch questions

Have you disassembled and inspected in the 30k since you changed the clutch? If not, curious how you can be certain there is no contamination. Not saying there is a leak/contamination, just wondering how you came to exclude it.

Could be +1 on what Gary said.

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post #4 of 13 Old Oct 7th, 2012, 10:54 pm
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Re: General clutch questions

Do you cover the clutch lever when you ride? If so, that's where my money is at. Even the slightest compression can cause pressure buildup and slippage.


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post #5 of 13 Old Oct 8th, 2012, 9:43 am
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Re: General clutch questions

Quote:
Originally Posted by deanwoolsey
Do you cover the clutch lever when you ride? If so, that's where my money is at. Even the slightest compression can cause pressure buildup and slippage.
It is surprisingly easy to wear out a dry clutch which is why car manufacturers push automatics

Gary
2018 R1200RT
Past rides
2012 K1600GTL
2000 K1200LT
1992 K1100LT
2000 V Star 650/Velorex sidecar
1985 K100RT
1965 R60/2
1960 AJS 500 single
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post #6 of 13 Old Oct 8th, 2012, 10:31 am
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Re: General clutch questions

While we're on clutches, here's a question for the experts.

My clutch engagement point seems to change after I've ridden for a while. The clutch has always engaged pretty close to the end of the lever travel, but lately is seems to start out engaging like normal, but after riding for an hour or so it begins engaging even closer to the end. Is this normal or indicative of something wearing out? I've tested for slipping with the 5th gear hammer on, but no slippage. The bike has 35,000+ miles on it.

Thanks for any input.

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2018 Honda CRF250L Rally (fun on the fire roads)
2015 R1200 RT (holy cow…what a bike)
2007 K1200 LT (sold)
2005 DR 650 (sold)
2002 Harley Ultra (sold)
1999 Harley Road King (sold)
1996 K1100 LT (sold)
1990 Honda Shadow (sold)
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post #7 of 13 Old Oct 8th, 2012, 10:52 am
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Re: General clutch questions

Quote:
Originally Posted by pickerbiker
While we're on clutches, here's a question for the experts.

My clutch engagement point seems to change after I've ridden for a while.
I am certainly no expert but I think this sounds like a clutch master cylinder issue, my car does the same thing and if I actually drove it anywhere I might care. I suspect that either pressure in the line is being retained when it should not, or there is seepage past the plunger doohickey. I'm sure others will have more intelligent answers and I will be watching.
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post #8 of 13 Old Oct 8th, 2012, 11:18 am
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Re: General clutch questions

the piston in the master cylinder can stick before it returns all the way out to the rest position - dirt, corrosion, seals hardening, probably pretty rare
if the relief hole (master cyl) were to get plugged will cause problems, piece of crap in line floating around, when was last time fluid changed

Gary
2018 R1200RT
Past rides
2012 K1600GTL
2000 K1200LT
1992 K1100LT
2000 V Star 650/Velorex sidecar
1985 K100RT
1965 R60/2
1960 AJS 500 single
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post #9 of 13 Old Oct 8th, 2012, 1:27 pm
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Re: General clutch questions

Quote:
Originally Posted by gary45
the piston in the master cylinder can stick before it returns all the way out to the rest position - dirt, corrosion, seals hardening, probably pretty rare
if the relief hole (master cyl) were to get plugged will cause problems, piece of crap in line floating around, when was last time fluid changed
I change the fluid every 2 years, just changed it about 30 days ago and the condition existed before and after I changed it. I was wondering if it could be an issue with the slave?

Life happens...you control your reaction.

2017 KTM 350 EXC-F (single track monster)
2018 Honda CRF250L Rally (fun on the fire roads)
2015 R1200 RT (holy cow…what a bike)
2007 K1200 LT (sold)
2005 DR 650 (sold)
2002 Harley Ultra (sold)
1999 Harley Road King (sold)
1996 K1100 LT (sold)
1990 Honda Shadow (sold)
1978-1993 Raising Kids; Paying Mortgages
1975 Honda CB550 (sold but wish I still had)
Homemade Motor Bike (mounted a 3.5 HP Briggs & Stratton on my bicycle at age 12)
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post #10 of 13 Old Oct 8th, 2012, 1:54 pm
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Re: General clutch questions

Quote:
Originally Posted by pickerbiker
I change the fluid every 2 years, just changed it about 30 days ago and the condition existed before and after I changed it. I was wondering if it could be an issue with the slave?
it's a lot of work to get to the slave, it would get hot when the bike warmed up which would go along with the problem showing after riding for awhile, something could be sticking, intermitant problems not easy to find, when clutch released the piston in the slave goes back into the housing away from where dirt etc would cause a problem

Gary
2018 R1200RT
Past rides
2012 K1600GTL
2000 K1200LT
1992 K1100LT
2000 V Star 650/Velorex sidecar
1985 K100RT
1965 R60/2
1960 AJS 500 single
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post #11 of 13 Old Oct 8th, 2012, 1:56 pm Thread Starter
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Re: General clutch questions

I don't think I cover the clutch. I'm trying to stay acutely aware of how I start and shift. My revs stay low until the clutch is out, then I hammer it, and when I shift up, I make sure I'm fully engaged before laying into the throttle.
I do ride it hard, but I don't think I'm abusive.
Think what my original question was, is there something in the repair process that can go wrong that might cause the clutch to slip?
I do like the suggestion about the slave hanging up, so I think I'll change the fluid again and see what happens.
Thanks guys.
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post #12 of 13 Old Oct 8th, 2012, 2:47 pm
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Re: General clutch questions

Quote:
Originally Posted by fpmlt
I don't think I cover the clutch. I'm trying to stay acutely aware of how I start and shift. My revs stay low until the clutch is out, then I hammer it, and when I shift up, I make sure I'm fully engaged before laying into the throttle.
I do ride it hard, but I don't think I'm abusive.
Think what my original question was, is there something in the repair process that can go wrong that might cause the clutch to slip?
I do like the suggestion about the slave hanging up, so I think I'll change the fluid again and see what happens.
Thanks guys.
easier to make sure master cylinder piston coming all the way out to the circlip that keeps it in - dirt corrosion (white metal) - IF you have not looked there

Gary
2018 R1200RT
Past rides
2012 K1600GTL
2000 K1200LT
1992 K1100LT
2000 V Star 650/Velorex sidecar
1985 K100RT
1965 R60/2
1960 AJS 500 single
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post #13 of 13 Old Oct 8th, 2012, 4:55 pm
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Re: General clutch questions

Quote:
Originally Posted by gary45
it's a lot of work to get to the slave, it would get hot when the bike warmed up which would go along with the problem showing after riding for awhile, something could be sticking, intermitant problems not easy to find, when clutch released the piston in the slave goes back into the housing away from where dirt etc would cause a problem
Thanks, Gary. Other than being annoying, it really doesn't appear to be hurting anything and the bike runs great. Guess I'll just keep riding and fix it if it quits working, although I may go ahead and flush the clutch fluid again.

Life happens...you control your reaction.

2017 KTM 350 EXC-F (single track monster)
2018 Honda CRF250L Rally (fun on the fire roads)
2015 R1200 RT (holy cow…what a bike)
2007 K1200 LT (sold)
2005 DR 650 (sold)
2002 Harley Ultra (sold)
1999 Harley Road King (sold)
1996 K1100 LT (sold)
1990 Honda Shadow (sold)
1978-1993 Raising Kids; Paying Mortgages
1975 Honda CB550 (sold but wish I still had)
Homemade Motor Bike (mounted a 3.5 HP Briggs & Stratton on my bicycle at age 12)
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