Hello there fellow gg riders. Had a bit of an issue with the Mrs bike last week. She has had more slipping clutches than reasonable for a 2012 250 ridden gentle. Going into clutch number 4 last weekend she was prepared with the shurflex fiber disks. The problem is the are about .5 mm thicker than the OEM discs. Now I know the target is 9.75-9.85mm and I would have taken even 10mm.

The used OEM discs were 1.75-1.9mm thick but these new ones were 2.3mm thick. We didn't have enough of thinner steels to make up the difference so I tried to mix and match old and new but that didn't fix our slip even at correct height. We eventually tossed in all of the new thick clutches and had a hard heavy digital clutch as expected.

When I got back to her place I went and got her a pre measured pack online and convinced her that the 35€ a liter elf 75ww with synthetic eye of newt and frogs tears was the culprit for repeat issues.

So did she buy the wrong pack or has anyone else been sent a thick set too?

--Biff

Edited October 2, 201510 yr by biffsgasgas

Yeah, thats way too thick.

 

Normally there are 2 types in one pack. One thicker one, and two the same. Thick one should go first.

Yep we'll this came with no steel plates just frictions. Oh well buyers luck.

--Biff

The friction plates differ in thickness

 Sand them down a little. https://www.youtube.com/watch?v=Dv3sWgY-RjM

Or you could go backwards and buy the stiffer clutch spring from the early Pro`s. That is what I had to do this week, since my bike started slipping in 5th and 6th. Good Luck.

Edited October 2, 201510 yr by lineaway

As a GG owner its useful to have a selection of steels, they are pretty cheap.

 

Just fitted Surflex with 1.3 and 1.5mm - just the best clutch ever

I have found that the normal culprit if the fork height, not the clutch pack thickness. Although getting close to the pack thickness is a good place to start, the finger height adjusted with the correct steel plates must be correct or the clutch will not function correctly.

 

I am only bringing this up as I see reference to the clutch pack dimensions in your post, but no reference to the finger height. If set to GasGas numbers it would be rare to have a clutch slip. Truth be told, I have never set up a clutch based on pack thickness, only finger height, and always have great feeling, no-slip clutches.

 

I would also hesitate prior to using a full synthetic oil, and go for motor oil, auto transmission fluid, or semi-synthetic; all of these work well in those clutches.

 

Spencer

Edited October 4, 201510 yr by spenser

Both should be ok.

 

(out of my head)

fingerheight 17 +- 1

Pack 9,75 - 9,85

 

The problem most of the time is the pack which is/gets too thick (new kit too thick or swelling). The finger height gets lower due to this.

 

 

Edited October 4, 201510 yr by crazybond700

I bought an S3 clutch pack which also didn't have the correct thickness although it was supposed to be ready to use.

 

Like Elk says, I bought some separate steel plates to get the correct pack thickness and had a perfect clutch.

 

Gas Gas gives the desired pack thickness measurement, because that way it's very easy to calculate what steel plates thickness you need to achieve the correct pack thickness.

 

Synthetic oil is not the problem, I used GRO Gear Extreme, which is a fully synthetic oil and is even recommended by GasGas and is very similar to the Elf HTX 740.

 

Be careful when sanding off friction plates, I tried it and it made the clutch worse, very inconsistent engaging point. Better get some correct steel plates.

On the long run you are going to need those anyway, and that way you can always have a nice clutch, which is really one of the pro's of the pro, lol. (ok, its more work, but it can be awesome!)

She got her pre-measured clutch and both the thickness and finger heights are in the green now. She is now using atf and apparently riding in Mons was a success. 

 

Thank you!

 

--Biff