Hi guys.

Dont know if this has been talked about or not?

My wifes 06 620 has,what we were told when we bought it off the previous owner, has soft clutch springs in it , his gfriend had them installed to prevent severe compression lockups when she went down through the gears.
Its ok for my wife but I am going on a big ride (for me its a big ride) in November up the snowys and down to Mt Buffalow and back to the princes hwy and home and when Im on it and give it a gutfull it slips.
I am wanting to put the normal springs back in. It seems basic enough as I am mechanically minded and experienced in building performance motors for cars so thats no prob . BUT what springs am I looking for (standard 620?) and the best place to by them online. Do I need to get new bolts and cups aswell??

Any infor would be great thanks

Hey Jamie, welcome aboard.

Can't really help you with the pulling apart and putting back together stuff 'cos I'm useless. But I've never heard of anyone changing the clucth springs on a 620 ... they have about the lightest clutch pull going around - even lighter though with a larger diameter clutch slave I s'pose.

An '06 should have the APTC 'slipper' clutch so I don't undertsand why it would need to be modified to prevent compression lock-ups.

You'll have to wait for someone intelligent to answer your questions though I'm sorry.

Oh and your November trip through the Snowies won't include Ducati Turismo will it?

Maybe the easiest way to reach your goal would be to add a washer under or over the spring...
That will tighten them up and it's a free mod.

If you still want other springs - the stock from a 620 are the same as for the S2R 800.
Are you sure the current springs are softer? Don't know which bike that would be from. Maybe two springs were removed?

Minimum spring length is 36.5 mm. Liquid gasket on side cover. Grease and torque spring bolts to 5Nm.

Quote from: Betty on July 31, 2012, 03:56:23 AM
....

You'll have to wait for someone intelligent to answer your questions though I'm sorry.
...........

I'm surely more intelligent than Betty, but that doesn't mean I'm intelligent enough so double check everything said

Thanks Betty and Stop

yeeh its all a bit suss when we bought the bike. A friend of mine says there is no such thing as a "soft" spring as you guys said.
Not sure its got a slipper clutch either as I thought they were a race style clutch and I doubt there is one in there. Spose the only way to find out is pull it off?
Nah Betty its just a ride with a few mates.

Doesn't matter if it is an APTC or not (,but it is) because the spring considerations are the same.

Thanks stop. That helps. So I am presuming either the clutch plates are worn or the springs are stuffed ?

It's possible the plates are worn out... How many miles on the bike?

I've had a couple customer bikes with the APTC clutch suffer slippage with good plates.

I've found some shims that will fit the rather cramped quarters, and put enough more preload on the springs to get the clutch to stay hooked up.

It has got 20k on the clock so I presume thats enough time to warrant worn plastes. it just confused me how the seller said he put soft springs in? Now even more when I realize it has a slipper clutch in it. I wonder why he bothered to do anything with it.
I am purcasing new plates and springs anyway to be sure. then I will open her up and have a look.

Thanks again for all you help. I will keep you posted on my findings 

Shims 12mm ID x 18mm OD x 1mm thick, use 2 on each spring.

I SuperGlue 'em to the washer, as they've got to stay in place to fit around the post.

Quote from: jamie2548 on July 31, 2012, 01:41:34 PM
It has got 20k on the clock so I presume thats enough time to warrant worn plastes. it just confused me how the seller said he put soft springs in? Now even more when I realize it has a slipper clutch in it. I wonder why he bothered to do anything with it.
I am purcasing new plates and springs anyway to be sure. then I will open her up and have a look.

Thanks again for all you help. I will keep you posted on my findings 

Not unheard of to have a clutch start slipping at that mileage, but I'd say its been abused!! My old 750 has 92,000k on the clock and it still has the original clutch assembly in it and works fine!! 

I'd just throw a set of springs at it, they are cheap! Give the plates a clean and measure their thickness to make sure they are servicable and jobs done!! Easy job! 

My 620 has 45 on the clock, slips in 4th and 5th when the oil temp is under 50 degrees.. kinda annoying..

Oh and I just remember reading something 'way back when' about the type of oil being used ... and it causing slippage under certain circumstances.

If my recollection is correct, can someone with the technical know-how post their opinion?

Quote from: Betty on July 31, 2012, 05:43:48 PM
Oh and I just remember reading something 'way back when' about the type of oil being used ... and it causing slippage under certain circumstances.

If my recollection is correct, can someone with the technical know-how post their opinion?

Yep, yep!! Remember that one!!

Oil viscosity, oil additives, can and do play a part in a clutch slipping, along with wear of course! 

Cheers everyone.

I had a email from the previous owner saying the springs were getting on a bit and were going to be replaced. Bit of confusion on my behalf. Ya get that though. So i am going to change the springs and see what happens. Also will get some new clutch plates because they are already on order from the US.(along with oil cooler and KN airfilter.

Thanks for all your advice