Possible clutch slip( 2nd opinion pls)

[Gooner]

Hi all went out on my GS1000G at the weekend and experienced the following:-
When accelerating hard in 4 & 5 for a split second the revs increased but did not pull then it was pulling again.
The symptom does not happen in the other gear range
I have searched on here and it would seem that it may be the springs? Or possibly oil?
The oil I put in was 10w 40 but it was a general motor oil not specifically for bikes, could this be the reason?
I guess I should take springs out and measure but have not done this before so was wondering could it be the oil?
Any advice appreciated.

[Agemax]

is the clutch cable adjusted correctly, with a couple of mm freeplay at the lever?

[Gooner]

is the clutch cable adjusted correctly, with a couple of mm freeplay at the lever?

Yes I have 2-3mm free play at lever

[Agemax]

pull the clutch apart and check the springs and all the plates are within spec. go from there

[JTGS850GL]

Do as Agemax has said and verify everything. If it's all original, there's a pretty good bet that the springs are weak and need to be replaced. Don't go crazy with aftermarket heavy duty springs. OEM springs are good for another 30 years and are pretty inexpensive.

[AJ]

Many of us have cured this by replacing with heavier clutch springs. In most cases, you only need to replace half the springs (every other spring).

The clutch plates themselves can be very expensive, so this is a good time to inspect them, although stiffer springs are usually sufficient to tame the slipping clutch on a torquey bike like your GS1000G.

[tkent02]

Stock springs won't slip if the rest of the clutch is in working condition.

[Agemax]

dont use H/D springs unless you have bionic hands!

[wymple]

I just put in 3 new springs on my slightly slipping clutch on my 850G. They are EBC and were slightly longer than the old stock springs. I can't make it slip now, and it was worse than you describe.

[quexpress]

dont use H/D springs unless you have bionic hands!

.. or a hydraulic clutch.

[AJ]

dont use H/D springs unless you have bionic hands!

Hence the suggestion to start with only 3 of the springs.

[tkent02]

Still harder on cables, levers, perches and everything else, and completely unnecessary.

The stock springs don't slip.

[Big T]

with all this debate about springs, the oil can be a contributing factor

Modern car oil is not good for your clutch, I don't know if the UK has the same labeling as the US, but over here we avoid oil labeled "energy saving"

Diesel oil, like Shell Rotella T, is a good alternative to motorcycle oils

[Gooner]

Hi all thanks for all the advice.
Went in the garage today and readjusted the cable to a little over 3mm.
Well went out on bike today and could not get the slip so hopefully it was only that, if it happens again I will strip down and inspect all components.
Once again thanks to all.

[wymple]

Still harder on cables, levers, perches and everything else, and completely unnecessary.

The stock springs don't slip.

My old stock springs darn sure let it slip. Why should I worry about OEM if I cured it for 10 bucks? I can barely tell if it's any stiffer at the lever.