Fitting instructions for:
NGR Slipper clutch.
Congratulations
You have purchased a state of the art slipper clutch crafted in Italy by NGR. NGR slipper
clutches are recognised as the smoothest operating, most reliable slipper clutches by top
Ducati race teams and are used by esoteric Ducati partners such as Bimota and Vyrus.
Most high performance Japanese bikes are fitted with slipper clutches as standard to prevent
rear wheel hopping under engine braking conditions. Many riders now view slipper clutches as
a de facto performance and safety item for street use on larger displacement bikes. These days
no racing team takes to the track without one. Only three models of Ducati bikes have been
fitted with slipper clutches as standard and one of these is the new Multistrada 1200. If ever
there was a range of bikes crying out for a slipper clutch upgrade it is V-twin Ducatis that have
very high engine braking effect.
The patented design NGR slipper clutch is noted for it's very smooth operation, no start-off
shudder and super smooth in the braking zone!
• Patented slipper action.
• Long lasting & reliable as components are subject to less mechanical wear than
traditional slipper clutches.
• Manufactured from hard wearing and light weight ergal 7075-T6 aluminium
• Lightweight - 1210 grams! (including springs, retainers, dress plate and fasteners, But
not including basket and clutch plate set).
• No spider return spring, and hence no return spring failures and no finicky adjustment.
• Slipper action action can be adjusted in the pits or your garage in less than 5 minutes by
removing dress plate and swapping tuning springs. Supplied with 3 sets of slipper tuning
springs (race, road & touring).
• 6 sphere/6 ramp mechanism.
• Completely compatible with either Ducati OEM basket or NCR Superlight ergal basket.
• Manufactured from solid billet ergal (7075 aerospace aluminium)
Upgrade kits include:
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•
•
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NGR slipper clutch specific hub with unique anti-friction under hub control ring,
3 sets of slipper tuning springs (race, road & touring),
NGR slipper clutch specific pressure plate and red dress plate,
Both large and small clutch hub nuts to fit all Ducati's with dry clutches manufactured
from 1991-2011.
Serated hub retaining nut washer
Upgrade kits are designed to be used with either the original OEM aluminum basket and
friction plate sets or the NGR Superlight ergal baskets and
Complete kit includes all of the above plus:
• NGR Superlight Ergal clutch basket
• NGR superlight slipper clutch plate set
Adjustment
These are one of the fastest and easiest slipper clutches to set. Adjustment is done by simply
choosing from the combination of touring, road and race helper springs supplied.
Warning
The NGR Slipper clutch may only be used with clutch plate sets that have alloy friction plates
and clutches that use an alloy clutch basket. We only recommend that you use either genuine
NGR or Ducati alloy clutch plate sets and baskets with this slipper clutch. You can not use the
NGR slipper clutch with Ducatis fitted with steel baskets or steel friction plates. We offer alloy
basket and plate set upgrades for Ducatis from 1991 onwards.
Before starting
Fitting the slipper clutch is a relatively straight forward task. This job is recommended as
suitable for an experienced DIY mechanic or professional. Do not undertake this task if you are
not confident that you have the necessary skills or equipment. Before starting this task please
read these instructions and the service manual for your model Ducati. The only specialised
tools you will require are a torque wrench and clutch holding tool. FastBikeGear has a
professional workshop clutch holding tool that we are happy to lend you should you need it.
Items required before you commence work.
Suitable Torque wrench (20-200Nm range).
Clutch hub holding tool.
Service manual for your bike.
Service replacement items
Always replace the serrated washer that sits under the clutch hub/drum retaining nut when
replacing your hub or basket. A replacement serrated washer is included with the NGR slipper
clutch.
Clutch removal steps (refer to attached diagram for part names)
1. Remove only the four cap screws that hold your clutch cover to the right hand side of
2.
3.
4.
5.
6.
7.
your Ducati's engine case and remove the clutch cover. There are two extra cap screws
that pass through the clutch cover that hold on the right hand side engine cover. Do
not remove these cap screws.
Slacken the six pressure plate cap screws evenly and in a diagonal sequence and
remove the pressure plate. (Note that the pressure plate will have a arrow next to one
of the pressure plate cap screw holes. When refitting the plate this arrow must align
with the screw post that is marked with a slot in the top of it.)
Remove the clutch push rod.
Pick the clutch plates out of the clutch basket. Note and number the order and
orientation of the plates with a permanent marker as you take them off so that you can
reinstall them in their original positions in case you ever want to re-install your original
clutch.
Unscrew the large central nut that holds on the clutch drum, while holding the clutch
drum to prevent rotation. You will need a special tool to hold the drum while you undo
this nut. This nut will typically take some effort to undo and an extension bar may be
required to get the necessary leverage.
With the clutch nut removed, withdraw any serrated washers, headed collars, thrust
washers and O-rings fitted. Carefully note the orientation of the serrated washer and
which order they come off for re-installation. Please note the serrated washers are
designed as a one time only usage part, you should always fit a new
replacement serrated washer.
Slide the clutch hub off the input shaft
Clutch basket removal steps (Skip this step if you are using your original alloy
basket)
8. Slacken the eight clutch basket retaining bolts evenly and in a diagonal sequence.
9. Remove the clutch basket.
Fitting a New NGR clutch basket (Skip this step if you are using your original alloy
basket)
10. Hold the new clutch basket stationary with your clutch holding tool and tighten the six
cap screws evenly and in a diagonal sequence. The six cap screws must be tightened to
35 Nm using a torque wrench.
Fitting the slipper clutch.
1. Remove the red dress plate and alloy pressure plate from your new slipper clutch.
2. Slide the new slipper drum and hub assembly onto the central clutch shaft.
3. You will need to use your clutch holding tool again when refitting the large central nut
that holds on the clutch hub & drum. This nut must be torqued to the specification in
your manual. Please note that the serrated washer that sits under this nut is designed
as a one time usage part. You should always replace this washer with a new
serrated washer when refitting the clutch hub. Failure to do so could be bad!
4. Whether you are using an NGR slipper clutch plate set or reusing your existing alloy
clutch plate set, install the plates in the order listed below. Then check the stack height
is between 38 and 39mm. Correct stack height is important to the correct operation of
the slipper clutch.
Please email us for alternative instructions if you are reusing an existing 18 plate set
with 1.5mm steel plates instead of 2mm plates.
01=steel/2mm
02=steel/2mm
03=friction
04=steel convex/1.5mm [bent tooth (convex) face outwards, away from engine]
05=friction
06=steel/2mm
07=friction
08=steel/2mm
09=friction
10=steel/2mm
11=friction
12=steel/2mm
13=friction
14=steel/2mm
15=friction
16=steel/2mm
5. Please check your clutch plate disc pack height before inserting the plates in your
basket. Your clutch disc pack height must be 39mm =/-0.5mm. The easiest way to
check this is using vernier callipers.
6. If you are reusing your original alloy basket, and plate set, check the clearance of the
friction plate fingers on your new basket with a feeler gauge. If outside the tolerance
specified in your manual (normally 0.6mm) please also replace the clutch basket and
plate set.
7. Slide the clutch pressure plate on over the columns.
8. Next select and insert the appropriate slipper pre-load springs into the hub columns.
Note it is common practice to use a combination of two different coloured springs to fine
tune the slipper action to your preference. e.g 3 blue springs and 3 yellow springs.
1.
2.
3.
4.
5.
Six Black (rarely used, extreme race for highly modified Superbikes, not
normally included in kit)
Six Blue (race)
Six Yellow (aggressive road, or race use)
Three Orange & three Yellow (default Road)
Orange (touring or wet road use)
Most road riders will use option 3 or 4. In situations where you have more grip you can
use harder springs. Black are the hardest springs and Orange are the weakest. If you
are not sure what's going to suit best, start with a softer spring option first.
9. Insert the main springs into the pressure plate and install the gold spring retaining
column plugs. FastBikeGear recommends you apply a very thin smear of anti seize
paste is applied to the spring retaining plugs to prevent long term galling of the threads.
Tighten the spring retaining screws to 25Nm with a torque wrench.
10. Lastly fit the red dress plate cover and nip the six dress plate retaining screws up to
approx 7Nm. Again we recommend you apply a very thin smear of anti seize paste is
applied to the six steel cap screws that hold on the dress cover. Do not over tighten
these screws.
Table of torque settings:
8 x Clutch basket fitting bolts
35 Nm
1 x Clutch hub & drum assembly retaining nut
Please consult the manual for year bike.
Typically Later model Superbikes require
between 236 and 264 Nm and earlier bikes
between 180 and 200Nm
6 x Gold pre-load spring retaining plug screws
25 Nm
6 x gold hub column nuts, accessed from rear of hub
20 Nm (fitted and torqued at factory)
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