Beta Sincro Snatchy clutch...

[trevbul1]

Hi All, 

I treated myself to a new Sincro but am gutted that the last point of clutch lever travel before full engagement is a light-switch effect that makes the bike jump forward - seriously annoying where you need to stay precisely on line in a tight turn.

I have tried all three built in pre-sets on the diaphram clutch, but to no avail; the lever is not heavy on the fingers but the bite is too sudden to control with clutch slip I would normally use on almost any other bike.

The bike has only done three hours on the original Liquid Moly oil. My old Evo wasn't like this.

Please, any ideas at all? Otherwise I'll have to sell it and go back to either TRS, GasGas or an earlier EVO!

Thanks and happy riding!

[Tr1AL]

14 hours ago, trevbul1 said:

Hi All, 

I treated myself to a new Sincro but am gutted that the last point of clutch lever travel before full engagement is a light-switch effect that makes the bike jump forward - seriously annoying where you need to stay precisely on line in a tight turn.

I have tried all three built in pre-sets on the diaphram clutch, but to no avail; the lever is not heavy on the fingers but the bite is too sudden to control with clutch slip I would normally use on almost any other bike.

The bike has only done three hours on the original Liquid Moly oil. My old Evo wasn't like this.

Please, any ideas at all? Otherwise I'll have to sell it and go back to either TRS, GasGas or an earlier EVO!

Thanks and happy riding!

If t was me in your situation , I would be changing the oil and putting something different in to see if it altered the clutches operation. There are plenty to try out from 10w30 Mineral Transoil to ELF HTX 740 or PUTOLINE N-TECH TRANS GP , or GP10 , NILsl Clutch Trial Racing. and a few more on top. Different oils can give different clutch action. Have your clutch in bits and improve it with a bit of file work etc check everything is how it should be.. Did you thrash it while slipping the clutch in a high gear to punish it for its non compliance perhaps that may help 

what you describe sounds like the perfect clutch for a WTC rider it may be designed to behave  that way . Good luck in your quest. Regards Alan.

[dan williams]

Sadly few of us have a SINCRO to play with and it is a vastly different clutch. A few basic bits though. I'm surprised Beta went with six friction plates instead of the three used by the GasGas diaphragm clutch. One of the major advantages of the diaphragm spring is its non-linear force/deflection curve which allows more force to be applied to a clutch pack. For the things that are similar to the older coil spring clutch that may affect the speed of engagement the finish on the sides of the tabs of the friction plates in the clutch basket were a major contributor to the light-switch engagement of some Beta clutches. If you pull the fiber plates and look at the ends of the tabs that ride in the basket. If these are not smooth they can bind on the grooves in the basket and release with a snap under power causing a snatchy clutch. On the Evo/Rev3/Techno clutch smoothing these tabs made a large difference in engagement. Thicker oil will also slow down clutch engagement. If you take it apart again shoot some pics of the plates and the assembly so we can get an idea what we're looking at.

[trevbul1]

Brilliant, big thanks. I was thinking about changing the oil but didn't know what to repalce it with for the most promising results. Also I tried all three of the built-in clutch settings but I couldn't tell the difference at all! I'll try to find the time to photograph the plates tomorrow - at least getting them out is a quick job! Thanks again for your input. Trevor.