GP One "5 Disc HP" clutch slipping

[Svint1]

Hi all,

I've got an issue with the clutch in my KingwelleBFA 244 engine.... 45bhp...

The clutch keeps on slipping. (mainly when powerband hits in 4th gear now)
I've tried various springs and oils.

 

Currently I'm using BGM Superstrong racing red cork plates with 10W-50 Malossi oil... Springs are 5XL and 5L from SIP.

Any suggestions for making the clutch stop slipping? 


Any tips highly appreciated! :)

[M245]

Did you try Castrol MTX 75W-140? 
smells like puke but it used to help sometimes

[Svint1]

vor 12 Stunden schrieb M245:

Did you try Castrol MTX 75W-140? 
smells like puke but it used to help sometimes

Brilliant M245!

I have a few bottles of MTX 75-W140, so I'll test that.

The cork plates has only done about 2km, so I'll try to "flush" the gearbox with 75-140 a few times and see if it works.
-if not, it is yet another set of new cork plates....

As said I'm using BGM Superstrong Racing Red plates at the moment.

-any suggestion for other(better) plates?

Rgrds
Ø

[Evorox]

Why don‘t you use all 10 springs in XL spec?

BGM friction plates are fine, no issues here.

Bearbeitet 1. Juni von Evorox

[Svint1]

Am 1.6.2025 um 12:56 schrieb Evorox:

Why don‘t you use all 10 springs in XL spec?

BGM friction plates are fine, no issues here.

Didn't have available, but ordered full set of XL springs now....

[Svint1]

And it slips like h#ll again....

-with 75W140 oil....

Could it be the plates "contaminated" with old oil or?

I have new plates and XL springs on the way, but not sure if that is sufficient.

Anyone using GP-one clutch with 45bhp without slipping?
-what setup of springs and oil are you using?

 

 

Last attempt before going for another clutch.

[vespazieren]

Why dont you ask manufacturer Gernot from GP One...?

[Svint1]

vor 11 Minuten schrieb vespazieren:

Why dont you ask manufacturer Gernot from GP One...?

I’ve asked, and his suggestions/tips doesn’t work/help…

-unfortunately. 
 

He’s been helping as good as possible, But seems like the BFA has «too much» power for the clutch…

[Evorox]

With stiffest possible springs it works, I‘m using only 4 disc BFA clutches, same BGM friction plates and stiffest springs available and having zero issues even not using MTX oil.

[Tim Ey]

I have a more than 10 year old GP one: mine had the issue that the springs were not compressed enough to supply sufficient force. So i made myself shims to press on the domes. 
 

But if you need a shim or not depends on the start length of your spring.

[Dr.Tyrell]

vor 20 Stunden schrieb Svint1:

Could it be the plates "contaminated" with old oil or?
 

Had exactly that issue. The old plates are still filled with the old oil and soaked with that. I bought new ones and had no slipping after that. But with Castrol MTX. MTX did help with non slipping plates. Avoid using Big Ear with MTX, I had sticking plates with that, I needed to pull the clutch and kick slowly to loosen them up. Was anoying so I used other really old NOS plates from MECEUR, or how they were called 

 

You could try Egigs 6 plate clutch with the BFA. 45hp are really not that easy for any clutch  but the 6 plate should be able to do that. 

[Svint1]

Am 3.6.2025 um 07:22 schrieb Tim Ey:

I have a more than 10 year old GP one: mine had the issue that the springs were not compressed enough to supply sufficient force. So i made myself shims to press on the domes. 
 

But if you need a shim or not depends on the start length of your spring.

Probably the same challange with my clutch, as it appers that the springs is a bit short...

Anyhow, 6 disk clutch from Egig is on the way and hopefully readily installed for the rally next weekend....