Clutch slippage in higher gears when I'm getting on it.


Information and questions on GL1000 Goldwings (1975-1979)
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Dan1todd
Posts: 9
Joined: Sun Mar 18, 2018 7:05 pm
Location: Bakersfield, CA
Motorcycle: 1975 and 1979 Honda GL1000 Goldwing

Clutch slippage in higher gears when I'm getting on it.

Post by Dan1todd » Sun Mar 18, 2018 7:20 pm



My 1975 seams to slip during extreme acceleration. usually at 5,500 to 7,000 rpms (hard acceleration). Another symptom is the bike is not great off the line and the clutch will slip if I push the bike very hard. I am not very clutch cable adjustment savoy. Bakersfield, CA is very limited on older Honda mechanics.

Recommendations?



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ekvh
Posts: 306
Joined: Thu Apr 29, 2010 9:52 am
Location: Grand Forks, ND
Motorcycle: 1977 gl1000

Re: Clutch slippage in higher gears when I'm getting on it.

Post by ekvh » Sun Mar 18, 2018 10:17 pm

Sorry to say if you already know this, but many don’t know that wet clutches need proper oil with no friction modifiers. A 77 I had did exactly as yours until I changed the oil from regular automotive oil to Rotella 15/40.

They make motorcycle specific oil as well.

I currently run Rotella T6 I think. It doesn’t seem to shift as smoothly.

The gearing is poor for quick takeoffs, but up at 5500 they come to life pretty well. There are aftermarket rear rims that are an inch smaller in diameter that help a little.

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Fred Camper
Posts: 1302
Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: Clutch slippage in higher gears when I'm getting on it.

Post by Fred Camper » Sun Mar 18, 2018 10:32 pm

Oil is a big deal for wet clutch use. If you are using a motorcycle specific oil or a Rotella or similar oil known to work well in motorcycle clutch use, then perhaps it is getting worn out.

The 1975 did not have a strong clutch, it was said it could last for less than two days at the dragstrip. The 1200 clutch is said to be stronger but requires engine removal to drop into place.

Dan1todd
Posts: 9
Joined: Sun Mar 18, 2018 7:05 pm
Location: Bakersfield, CA
Motorcycle: 1975 and 1979 Honda GL1000 Goldwing

Re: Clutch slippage in higher gears when I'm getting on it.

Post by Dan1todd » Sun Mar 18, 2018 10:35 pm

Can the 1200 clutch work with the 1000?

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Fred Camper
Posts: 1302
Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: Clutch slippage in higher gears when I'm getting on it.

Post by Fred Camper » Sun Mar 18, 2018 10:44 pm

A kit is available to move to the Hydraulic lever version but pretty sure the 1200 also had a cable clutch on early versions but I do not know that for sure. I plan to install the Hydraulic version sometime soon in my 1977.

Dan1todd
Posts: 9
Joined: Sun Mar 18, 2018 7:05 pm
Location: Bakersfield, CA
Motorcycle: 1975 and 1979 Honda GL1000 Goldwing

Re: Clutch slippage in higher gears when I'm getting on it.

Post by Dan1todd » Sun Mar 18, 2018 10:55 pm

Thank you. Good info

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ekvh
Posts: 306
Joined: Thu Apr 29, 2010 9:52 am
Location: Grand Forks, ND
Motorcycle: 1977 gl1000

Re: Clutch slippage in higher gears when I'm getting on it.

Post by ekvh » Sun Mar 18, 2018 11:58 pm

Good tutorial by Oldfogey here: https://www.ngwclub.com/forum/viewtopic.php?t=22244

It may be somewhere here too. Probably easier to drop the 1200 clutch in with the 1200 motor still attached.

Shadowjack
Posts: 36
Joined: Wed Aug 17, 2011 5:22 pm
Location: Bellevue, NE
Motorcycle: 1977 GL1000
1975 CB750
2011 NT700VA

Re: Clutch slippage in higher gears when I'm getting on it.

Post by Shadowjack » Mon Mar 19, 2018 8:01 am

I did the 1200 hydraulic clutch conversion on my '77, it's good. That won't cure your slippage problem, though. You need the cover plate from an '84-only 1200; there were no cable clutches on 1200s. There were several Hondas of the era that had hydraulic clutches; the master cylinders are all about the same, except for the angle of the reservoir to fit the bars they were made for. You can JUST get the cover and slave cylinder in without taking the engine out.

Dan1todd
Posts: 9
Joined: Sun Mar 18, 2018 7:05 pm
Location: Bakersfield, CA
Motorcycle: 1975 and 1979 Honda GL1000 Goldwing

Re: Clutch slippage in higher gears when I'm getting on it.

Post by Dan1todd » Mon Mar 19, 2018 8:13 am

Guys, this is all very good information. My close friend is an airplane mechanic and we are going to change out the oil this week and well as make a minor adjustment to see if it improves.

A quick note, my 1979 does not have this problem so maybe the clutch is just near its end. :(
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sfruechte
Posts: 211
Joined: Tue Mar 09, 2010 12:53 pm
Location: La Crosse, WI
Motorcycle: 1977 GL1000

Re: Clutch slippage in higher gears when I'm getting on it.

Post by sfruechte » Tue Apr 03, 2018 9:53 am

My 77 still has the original clutch at 223,000 miles and the only time it has ever slipped is when the clutch cable was starting to stick.



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