2014 tri280 clutch dragging

[Tr1AL]

2 hours ago, larro said:

Thank you for your combined input. The bike was second hand so was expecting things to be fixed. The clutch was/is a problem from the first time i started the engine as straight away it dragged as explained above. I changed the mineral oil in the master and expelled all the air and the lever felt good after but it still dragged. New motor oil and new clutch and the old clutch seemed ok and the pack measured the same as the new one so i was disappointed that the new clutch did not fix this problem. I was going to change the master cylinder fluid to magura royal blood as konrad mentioned but i cant see that stopping the dragg. He has also said that the cluch is not disengaging properly so i don't know. The thing is how many oils is someone supposed to try. Thanks.

If you feel that you have covered all the bases and to no avail there is one more thing that you could try and that would be to clean the excess bonded material in the gaps between the clutch fibre pads the idea being to allow oil/fluid  to move away from the fibre pads to reduce drag. For example use a scraper with a sharp edge such as the type available in a scalpel set. Good luck.

[konrad]

I don't think oil is going to fix this.  Assuming you are 100% certain there is no air in the hydraulic system (which presents as a spongy clutch lever) I would look at the step in the OE CLUTCH SPRING SUPPORT PLATE.  There can be considerable variation in the step dimension, as one of my photos shows.  All three of my bikes were different.  It's possible Xiu's clutch control ring on setting 1 could fix this problem (or, at least, improve it).

Can the previous owner give any guidance if the bike's clutch EVER worked properly?

It's also possible there's too much play in the clutch inner hub, and this is wasting valuable pressure plate movement.  See: https://www.ossa-efi.com/home/engine/gearbox/locker-shaft#h.ewk76gf4gqtf

[Tr1AL]

17 hours ago, konrad said:

I don't think oil is going to fix this.  Assuming you are 100% certain there is no air in the hydraulic system (which presents as a spongy clutch lever) I would look at the step in the OE CLUTCH SPRING SUPPORT PLATE.  There can be considerable variation in the step dimension, as one of my photos shows.  All three of my bikes were different.  It's possible Xiu's clutch control ring on setting 1 could fix this problem (or, at least, improve it).

Can the previous owner give any guidance if the bike's clutch EVER worked properly?

It's also possible there's too much play in the clutch inner hub, and this is wasting valuable pressure plate movement.  See: https://www.ossa-efi.com/home/engine/gearbox/locker-shaft#h.ewk76gf4gqtf

Hi Konrad that OSSA motor sounds like the most needy badly engineered lump available perhaps that is why Fajardo arrived  and exited so swiftly. 

[Tr1AL]

@larro Konrad knows as much if not more than the man that designed it so you are much better off listening to him than me obviously.  I only have one more thing to add which is are the inner edges of the clutch basket teeth where the edges of the clutch plates slide completely smooth and also the edges of the tangs on the plates themselves are they deburred/ clean if not you could clean them up with a file to make the clutch plate movement as smooth as it can be to aid separation. 

[konrad]

Tr1Al, I'll take your remarks as an undeserved compliment.  Thank you.  I've always been much more interested in the "why" than the "what", so I've spent a lot of time trying to figure things out.

I do appreciate a challenge, and the OSSA certainly is that.  But honesty, I feel the engineering of all trials bikes could be improved.  Unfortunately, the market is so small, there's never enough time or resources to do the job justice.  I view all motorcycles as just a starting point that I must bend to my will.

[larro]

Thanks to all that contributed.