Clutch - deep rear sprockets

[Knowledge]

...... & as Martin says What is this minimum clearance?

I guess it is measurable. Perhaps you could place a blob of plasticene beneath the pressure plate, then build the clutch, then take it apart and measure the thickness of the plasticene.

[DaveTomo]

The clutch brass is rocking on the Atomic clutch pressure plate
How the Atomic pressure plate is protruding so when side casing is fitted its tight against brass pusher

Would this help? http://pistonported.weebly.com/sscmorri ... cover.html different clutch but similar issue?

[Norrie Bodge]

I just found this picture of the spider, taken from the ScootRS website. http://scootrs.com/category.cfm?category=7



It looks like the total height of the new spider is the same as the original Innocenti item, so this should not be an issue. Shortly, I will have one of my own, so I can take some measurements to confirm this.

Martin

the hight isnt the same Martin mate?
the Atomic is again 3mm? deeper fella, see below

[dscscotty]

These are if set up correctly fantastic clutches, there are some minor modifications required to get the best results, but once sorted they have proven to be very reliable and capable of handling some decent power, Oh and several of them have won BSM Championships, completed LE JOG one of those in under 24hrs. Just think a little before setting one up, Whilst cassette type clutches are great, I prefer this type as should they go wrong they are cheap to repair and easy to fix at the road side and I don't know many people who carry spares for cassette type clutches in their tool box.

[Knowledge]

the hight isnt the same Martin mate?
the Atomic is again 3mm? deeper fella, see below

That wasn't the dimension I was thinking of, Norrie. Frankly, I'd be disappointed if they were the same dimension in the area you have illustrated.

No, I'm thinking that total height looks the same. The area you highlight is compensated by a recess which is visible in other photos on the Scoot RS website.

Martin

(I wish my spide would arrive, so I can take some proper measurements)

[Norrie Bodge]

Lads I'm gonna try adding a std steel & cork in with the Reedspeed 5plate kit?
What do ya recon, ??

[Knowledge]

Go for it Norrie.

It will take 10 mins and the result will be visible immediately and without road testing.

You have nothing to lose, so do it.

[Norrie Bodge]

Go for it Norrie.

It will take 10 mins and the result will be visible immediately and without road testing.

You have nothing to lose, so do it.

Tonight after work mate, I will take a pic on the result

[Norrie Bodge]

i tried the exta std cork & steel, & no joy m8
i would have to notch out the crownwheel for the lugs to slot in on 1st cork plate.
i couldnt get the circlip anywhere near with 6 plates?
its now fitted with Atomic-spider/std pressure plate & the 5plate Reedspeed clutch..... the side casing fits as it should

[Captain Pugwash]

i tried the exta std cork & steel, & no joy m8
i would have to notch out the crownwheel for the lugs to slot in on 1st cork plate.
i couldnt get the circlip anywhere near with 6 plates?
its now fitted with Atomic-spider/std pressure plate & the 5plate Reedspeed clutch..... the side casing fits as it should

This is my clutch on my Avanti engine.

It uses a similar clutch spider to the Atomic, but to take advantage of the deeper sitting spider the clutch sprocket needs machining so the clutch plates can sit deeper, machined like this the standard sprocket and updated spider will easily take 5 standard corks and 4 steels. Or 6 thin corks and 5 steels.

This pulls the clutch bell further into the sprocket, that might stop yours from hitting the side case
Here's a pic of mine.

[Norrie Bodge]

ahhoooy.... thats exactly as i mean Pugwash m8

cheers m8

[Knowledge]

My sprockets are always modified to allow the bottom cork plate to sit lower. I am fortunate to have access to a milling machine, when no one is looking.

[Norrie Bodge]

its a Readspeed 5plate clutch kit & all plates thickness including top plate = 19mm

heres the Atomic on the left compared to std pressure plate

sorry to revive this thread after a longtime...
but im attempting this again, in a new build TS-1 motor for my Series-2

im trying 2use the Atomic clutch bits again from last time...?
is anyone using one of these Atomic clutch pressure plate & spider combinations??
& if so what setup have you got ? 5plate 6? thin steels? etc etc

cheers

[rossclark]

I suspect you'll need to,carefully check the spider - sprocket I have an atomic spider and centre plate and checked it with several combinations of sprocket. ScootRS sprocket was OK, but with an MB sprocket the spider was lower than the sprocket.

[Norrie Bodge]

I believe my issues are with the depth of the pressure plate?

As last year when I 1st posted this issue on my GP?
I ended up fitting a std pressure plate using the deep Atomic spider & a 5plate reedspeed clutch kit
& it works great !!
I'm back now trying to fit the same but with the deeper Atomic pressure plate as in post #
& this time With a crown wheel Notched for the 1st cork plate.

Just emailed scoot-RS to see what advise they give to use them together?

Cheers

[Norrie Bodge]

its a Readspeed 5plate clutch kit & all plates thickness including top plate = 19mm

heres the Atomic on the left compared to std pressure plate

I believe my issues are with the depth of the pressure plate?

As last year when I 1st posted this issue on my GP?
I ended up fitting a std pressure plate using the deep Atomic spider & a 5plate reedspeed clutch kit
& it works great !!
I'm back now trying to fit the same but with the deeper Atomic pressure plate as in this quoted post .
& this time With a crown wheel Notched for the 1st cork plate. But it protrudes as before (see piccy)



I've then fitted 5 std plates & steels & It fits (see piccy) but I thinks my springs are then too compressed for the clutch to operate?



Just emailed scoot-RS to see what advise they give to use them together?

Cheers

[Wack]

Just out of interest, if you fitted an extra steel onto the pressure plate before fitting the rest of the plates, does it lower the pressure plate and still allow clearance when compressed?

[Adam_Winstone]

One issue that I found with the early ScootRS spiders that I bought (3 of!) was that the recesses for the bottom of the springs was not machined in the correct alignment for the springs to sit/stand straight when assembled. What I mean by that is the ScootRS spider had the recesses at a different distance from the centre of spider to centre of recesses, which meant that the bottom of the spring was on one alignment and the top of the spring was on another, causing the spring to sit in a 'Z' shape and try to bow when the clutch was compressed. This was fine in a number of mild tune bikes with 5-plate assemblies, however, it soon proved to be an issue with higher power motors.

A couple of key things that I must point out is that the spring alignment was out when used with a selection of original factory pressure plates (Innocenti, Spanish and SIL), and also an MB pressure plate, however, I have never tried a ScootRS pressure plate, which may also have the spring recesses at the same centres as their spider, in which case it would work perfectly well. What this did show was that buy buying different clutch components from different supplies can introduce unforeseen problems. As such, buying a ScootRS pressure plate may well have rectified the issue with the spider, however, I was not in the mood to buy additional (not cheap) parts to find that it was simply continuing to shell out for individual components that didn't align correctly when assembled.

NB: This isn't to have a go at ScootRS, this is more a lesson about buying parts from different sources, and I could just as easily say the same about other expensive clutch components that I've bought in the UK that have also had machining errors that introduced other issues.

IMO you should buy a complete clutch from one supplier so that you can go back to them if you have issue, rather than buying different components in different places and trying to then point the finger at any one supplier.

Adam

[Norrie Bodge]

..........,.

[Norrie Bodge]

Just out of interest, if you fitted an extra steel onto the pressure plate before fitting the rest of the plates, does it lower the pressure plate and still allow clearance when compressed?

Cheers for replying but I haven't m8
steel on steel is a no-no in the clutch I thinks tho ?
Ru thinking to fill it out?
The Taffspeed springs I have compress to 16mm