Clutch stutter under hard acceleration/shifting


Information and questions on GL1500 Goldwings (1988-2000)
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oakback
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Clutch stutter under hard acceleration/shifting

Post by oakback »



If I'm trying to pretend I'm on a sport bike, and I'm accelerating and shift quickly, when re-engaging the clutch I'll get a weird stutter. It feels as if the clutch is repeatedly and quickly engaging and disengaging. It doesn't feel like a clutch going bad and steadily slipping (at least that's what my experience in a car with worn clutch felt like). If I back off the throttle and roll on more gently, it feels fine. If I pull in the clutch and let it out more gently, it's fine.

I know the easy answer is to not slam the clutch while shifting on hard acceleration, but I'm mainly wondering if this is indicative of some other issue that needs to be addressed.



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ct1500
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Re: Clutch stutter under hard acceleration/shifting

Post by ct1500 »

Year and mileage, did it ever tow a trailer?
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newday777
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1983 GL1100A Wineberry 36,000 miles

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Re: Clutch stutter under hard acceleration/shifting

Post by newday777 »

oakback wrote:
Thu Jun 18, 2020 11:05 am
If I'm trying to pretend I'm on a sport bike, and I'm accelerating and shift quickly, when re-engaging the clutch I'll get a weird stutter. It feels as if the clutch is repeatedly and quickly engaging and disengaging. It doesn't feel like a clutch going bad and steadily slipping (at least that's what my experience in a car with worn clutch felt like). If I back off the throttle and roll on more gently, it feels fine. If I pull in the clutch and let it out more gently, it's fine.

I know the easy answer is to not slam the clutch while shifting on hard acceleration, but I'm mainly wondering if this is indicative of some other issue that needs to be addressed.
The goldwings do not have undercut gears for fast racebike shifting. Many goldwing transmissions have suffered failure because of rider error thinking they can shift as they do on a sport bike....
I like to play with the sport bikes in the twisties.....but this is one area I have to pay close attention to do full deliberate shifts or it will pop out and sometimes feel as though there was slippage.

oakback
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Re: Clutch stutter under hard acceleration/shifting

Post by oakback »

ct1500 wrote:
Thu Jun 18, 2020 5:24 pm
Year and mileage, did it ever tow a trailer?
1990, 114,400 miles, it does not have a hitch but I have no idea if a trailer was used in the past, I purchased it in April 2020.
newday777 wrote:
Fri Jun 19, 2020 10:14 am
The goldwings do not have undercut gears for fast racebike shifting. Many goldwing transmissions have suffered failure because of rider error thinking they can shift as they do on a sport bike....
I like to play with the sport bikes in the twisties.....but this is one area I have to pay close attention to do full deliberate shifts or it will pop out and sometimes feel as though there was slippage.
Good to know! I also purchased the shift shaft brace (haven't installed yet), so hopefully that too (along with not driving like a lunatic) will prolong the transmission health.

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Swagonmaster
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Re: Clutch stutter under hard acceleration/shifting

Post by Swagonmaster »

I've also read that certain oils containing friction modifiers will cause clutch issues, you might try changing the oil and see if it helps.
Try to learn from the mistakes of others..... you won't live long enough to make them all yourself!

oakback
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Re: Clutch stutter under hard acceleration/shifting

Post by oakback »

Swagonmaster wrote:
Wed Jun 24, 2020 8:25 am
I've also read that certain oils containing friction modifiers will cause clutch issues, you might try changing the oil and see if it helps.
I just did in April, using an oil with no friction modifiers. But thanks for chiming in, I've read that friction modifiers are bad for wet clutch, but I wasn't sure what the symptoms would be.

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Swagonmaster
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Re: Clutch stutter under hard acceleration/shifting

Post by Swagonmaster »

From what I hear symptoms are yelling, bad language and dreams of expensive repairs. Just what I've heard. (The two worst liars in town are "I heard" and "they said", just what I've heard you understand)
Try to learn from the mistakes of others..... you won't live long enough to make them all yourself!

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newday777
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Location: Milford NH summer/fall & Oceanside, CA winters(N San Diego) with lots of miles riden between
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1983 GL1100A Wineberry 36,000 miles

1975 CB750 K5 Planet Blue 7,800 miles

1976 CB750 K6 Anterris Red 25,000 miles

Past rides
1999A Restored from PO neglect & sold at 19,000 miles

1999SE Totaled by cager at 105,000 miles

Re: Clutch stutter under hard acceleration/shifting

Post by newday777 »

Swagonmaster wrote:
Wed Jun 24, 2020 10:52 am
From what I hear symptoms are yelling, bad language and dreams of expensive repairs. Just what I've heard. (The two worst liars in town are "I heard" and "they said", just what I've heard you understand)
Say What????

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MikeB
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Re: Clutch stutter under hard acceleration/shifting

Post by MikeB »

oakback wrote:
Thu Jun 18, 2020 11:05 am
If I'm trying to pretend I'm on a sport bike, and I'm accelerating and shift quickly, when re-engaging the clutch I'll get a weird stutter. It feels as if the clutch is repeatedly and quickly engaging and disengaging. It doesn't feel like a clutch going bad and steadily slipping (at least that's what my experience in a car with worn clutch felt like). If I back off the throttle and roll on more gently, it feels fine. If I pull in the clutch and let it out more gently, it's fine.

I know the easy answer is to not slam the clutch while shifting on hard acceleration, but I'm mainly wondering if this is indicative of some other issue that needs to be addressed.
Does this occur all the time or only after the bike has been ridden for a while?
My 1999 GL1500 Aspencade, when it only had about 12,000 miles on it, would react like that after everything was all warmed up and had been ridden for a while. It was particularly noticeable when riding two up and starting from a dead stop. From that point on, I started to use synthetic oils. I no longer had the chattering like issue when hot and two up.

That bike had 161,000 miles on it when I sold it to a friend and my 1998 which I bought in 2010 has had synthetic oil in it since about 8000 miles. No clutch issues. That bike has 183,000 miles on it now and no clutch issues.

I've pulled trailers with both bikes and have done extensive rides solo and two up.

Try using synthetic oil.
MikeB
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WingAdmin
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Re: Clutch stutter under hard acceleration/shifting

Post by WingAdmin »

oakback wrote:
Wed Jun 24, 2020 8:28 am
Swagonmaster wrote:
Wed Jun 24, 2020 8:25 am
I've also read that certain oils containing friction modifiers will cause clutch issues, you might try changing the oil and see if it helps.
I just did in April, using an oil with no friction modifiers. But thanks for chiming in, I've read that friction modifiers are bad for wet clutch, but I wasn't sure what the symptoms would be.
Excessive clutch slip, to the point that it can become possible to break the clutch free and slip it without declutching at all, simply using engine torque.

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Swagonmaster
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Re: Clutch stutter under hard acceleration/shifting

Post by Swagonmaster »

Wingadmin, do you think that the po might have put friction modified oil in it and then changed it after issues and this is just the residual?
Try to learn from the mistakes of others..... you won't live long enough to make them all yourself!

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WingAdmin
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Re: Clutch stutter under hard acceleration/shifting

Post by WingAdmin »

Swagonmaster wrote:
Sat Jul 04, 2020 2:34 pm
Wingadmin, do you think that the po might have put friction modified oil in it and then changed it after issues and this is just the residual?
It's possible, it depends how long it was in there, and how it's soaked into the clutch plates. You might try a Seafoam treatment on the crankcase oil, followed by a fresh oil change and see if it improves.



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