Hilliard Inferno Fury Installation And Maintenance

IThese instructions cover both the Fury Kart racing clutch and the Flurry Snowmobile racing clutch.

The difference between the two models is the drum. The kart racing drums have holes for air flow and
heat dissipation. The snowmobile racing clutch uses a solid drum that prevents excessive chain
lubrication from entering the clutch. The parts are interchangeable between the designs.

This clutch is a two (2) piece mechanism. There is a potential that if the clutch is not assembled or
installed properly that serious injury can occur. It is VERY important that you follow all the directions
for proper clutch installation.

For best results, perform the following weekly maintenance

1. Drum & Sprocket: This area will get contaminated with oil, dirt, and other debris over time. Spray some
   WD-40 on a rag and wipe the inside of the drum. Wipe out as much dirt and debris as possible. The area
   where the drum and the shoes make contact is the heart of the clutch. A nice, clean, smooth surface provides
   the best consistency from race to race. Do not clean the drum with acetone, starting fluid, or carburetor
   cleaner. These cleaning fluids will remove all of the oil and will cause the clutch to become aggressive during
   engagement. A small amount of oil residue will give a more consistent coefficient of friction and longer clutch
   life. If the drum is galled and not smooth then you can sand the inside of the drum with fine sandpaper.
   Clean the drum I.D. with WD-40 after sanding.
2. Shoes: Spray some WD-40 on a rag and clean the outside of the shoe. Do not clean the shoes with
   acetone, starting fluid, or carburetor cleaner. These cleaning fluids will remove all of the oil and will cause the
   clutch to become aggressive during engagement. A small amount of oil residue will give a more consistent
   coefficient of friction and longer clutch life.
3. Bushing: Spray some WD-40 on a rag and clean the outside of the bushing. Apply one small drop of oil to
   the outside of the bushing. We recommend a lightweight oil. Do NOT use grease, never-seize, or lubricants
   containing Teflon. Do NOT excessively lubricate the bushing. Excessive lubricant will end up inside the drum.
   Only a small drop is needed. Centrifugal force and heat will cause some oil to come out of the pores of the
   bushing and it automatically lubricates the bushing during operation. Do NOT clean the bushing with
   acetone, starting fluid, or carburetor cleaner. The bushing is oil impregnated at the factory and these cleaning
   fluids will dissolve all of the oil out of the pores of the bushing. Do NOT put the bushing on a rag, paper,
   cardboard, or other porous surface because the oil will wick out of the bushing. The bushing must be wrapped
   in plastic or placed in a plastic bag for storage.
   Following these instructions will give you long life
   and the best performance out of the clutch.

CLUTCH ASSEMBLY:

Insert Weights: (BLAZE ONLY)
 These are optional, and not required for the clutch operation.
The snap rings that retain the weight are easily overstressed and damaged. NEVER RE-USE
THE SNAP RINGS. Once removed, discard, and replace with new.

Shoe Installation:
 Shoes are to be placed on the driving lugs of the hub (See illustration on page 4).
 Shoes should fit loosely on these lugs, and be able to slide freely on them.

Spring Installation:
 Use External Snap Ring Pliers to spread the springs apart for easy installation. DO NOT stretch
the springs any further than necessary for installation.
 If mismatching springs, make sure similar springs are opposite one another in the assembly.
keeping the clutch balanced. (see tuning section)

Sprocket Installation:
 Insert the sprocket into the drum.
 Using external snap ring pliers, place the bowed snap ring into the groove on the sprocket.
Because the snap ring is bowed there are two sides. Make sure the side marked “A” in the
following picture is away from the drum. Side “B” is toward the drum. The bowed snap ring
keeps the sprocket tight in the drum.

Bushing:
 Oil the bushing with one small drop of lightweight oil. Wipe off excess oil before installing into the
sprocket. The bushing is installed from the inside of the drum. The ears of the bushing will be
inside the drum when properly installed (See illustration on page 4).

Hilliard Inferno Bully Conversion Kit

WHEN YOU BUY YOUR CLUTCH FROM CPR, IT WILL INCLUDE THIS KIT.

PRIOR TO ASSEMBLY: SPRAY SOME WD-40 ON A RAG AND WIPE THE INSIDE OF THE DRUM.

ASSEMBLY:

1. INSTALL (6) 1 1/8″ O.D. SPACER ON ENGINE SHAFT AGAINST SHOULDER.
2. INSTALL HARDENED BEARING RACE ON ENGINE SHAFT AGAINST THE SPACERS.
3. INSTALL #4-40 BUTTON HEAD SCREW INTO DRUM FROM SPROCKET SIDE.
   (CLEAN TAPPED HOLE & SCREW AND APPLY LOC-TITE PRIOR TO INSTALLING)
4. ASSEMBLE SPROCKET AND DRUM, INSTALL RETAINING RING (CENTER THE GAP BETWEEN THE EARS OF THE SNAP RING ON THE PORTION OF THE SCREW PROTRUDING INTO THE DRUM), INSTALL BEARING (IF SUPPLIED LOOSE) ONTO ENGINE SHAFT, OVER BEARING RACE AND AGAINST SPACER.
5. INSTALL 2 1/4″ O.D. SPACER AGAINST SPROCKET.
6. INSTALL HUB/SHOE/SPRING MECHANISM ONTO SHAFT AGAINST 2 1/4″ O.D. SPACER.
7. INSTALL WASHER AND BOLT ON END OF ENGINE SHAFT AND TIGHTEN. NO GAP IS REQUIRED WHEN USING THE CONVERSION KIT. CLUTCH CAN BE CLAMPED TIGHT ON THE SHAFT.

Inboard mounting (sprocket closest to the engine) is recommended
unless using a small sprocket that requires outboard mounting.

** FOR BRIGGS & STRATTON L0206 ENGINE USERS PLEASE SEE THE SECTION SPECIFIC FOR THAT
ENGINE **

 Slide the ¾” I.D., 1-1/8” O.D. washer (part # 8444-22-009) onto the crankshaft until it hits the
shoulder. This washer is used because some engines have a small shoulder or large radius on
the shoulder that is not large enough in diameter to retain the sprocket.
 Slide the bushing/sprocket drum assembly/washer onto the engine shaft.
 Slide on the hub/shoe/spring assembly on the engine shaft. The key in the hub will need to be
lined up with the keyway on the crankshaft to get the clutch to slide on completely. Make sure
the shoes and springs are inside the drum and the cover is toward the outside of the clutch.
You should be able to read the warning information on the face of the cover when it is
assembled properly (see illustration on page 4). The shoes should be fully enclosed under the
drum when installed properly. Please contact your clutch dealer if you are not sure if it is
assembled correctly. Improper assembly can cause serious injury or death.
 The crankshaft should be approximately 1/32” longer than the clutch assembly. (IF USING A BRIGGS & STRATTON L0206 please see the appropriate section.) This spacing will make sure
the clutch has some free end play to move. You must not clamp tight against the clutch with
the bolt and retaining washer or the bronze bushing will fail (Note: If you are using the Bully
conversion kit, you can clamp tight against the clutch because the bronze bushing is not used
with the conversion kit). After the bolt and retaining washer is tight you should be able to
move the clutch hub back and forth 1/32” (about the thickness of a business card). If the gap
is too large, then remove the clutch and place appropriate spacers (part # 8444-22-009 can be
purchased as needed) on the engine shaft, and re-install the clutch following the same
instructions. If the clutch is longer than the shaft then remove the bolt and retaining washer
and place the necessary amount of 5/16” washers on the bolt so the retaining washer will
clamp the 5/16” washers against the face of the shaft instead of the hub. These washers need
to fit inside the I.D. of the hub and are meant to create a gap between the clutch retaining
washer and the hub.
 Recheck your measurement for end play. (IF USING A BRIGGS & STRATTON L0206 please see the appropriate section.) You do not want to have the clutch clamped tight, nor do you
want too much room for it to move. This step is critical, and needs to be confirmed.

BRIGGS & STRATTON requires the clutch to be held tight on their crankshaft. The following instructions will
help you achieve that without damaging your clutch. (**DO NOT CLAMP the Hilliard Inferno clutch tight to the
shaft without following these instructions. Damage to the bushing will occur if you do not follow one of these 2
methods.)

Option 1: L0206 Clutch Mounting Kit.
 Acquire a Hilliard Clutch mounting kit, part number 8444-9u-030 from your dealer. (Not
included with this clutch.) The kit includes a bolt, lockwasher, a large washer, and a chamfered
spacer that are required for mounting to the L0206.
 Install the chamfered spacer on the engine first, making sure that the chamfer is over the
radius on the crankshaft. (Chamfer on the engine side.)
 Slide the bushing/sprocket drum assembly/washer onto the engine shaft.
 Slide on the hub/shoe/spring assembly on the engine shaft. The key in the hub will need to be
lined up with the keyway on the crankshaft to get the clutch to slide on completely. Make sure
the shoes and springs are inside the drum and the cover is toward the outside of the clutch.
You should be able to read the warning information on the face of the cover when it is
assembled properly. The shoes should be fully enclosed under the drum when installed
properly. Please contact your clutch dealer if you are not sure if it is assembled correctly.
Improper assembly can cause serious injury or death.
 Check to insure that the clutch overhangs the engine crankshaft, by .020” – .030”. (If the clutch
overhang is outside that range you need to remove the clutch and add or remove the
appropriate number of spacers (2 are provided with the clutch) to achieve the correct spacing.)
Apply the washers to the inside of the crankshaft. Reinstall the clutch per the instructions, and
recheck your spacing before moving on to the next step.
 Place the small lockwasher from the mounting kit, on the bolt.
 Place the large washer on the bolt. DO NOT SUBSITUTE THIS WASHER. The washer is designed
to provide the correct clamping force, and flex to insure that there is no damage to the clutch
bushing. (The order should be bolt head, lockwasher, then large washer.)
 Install the bolt to the end of the crankshaft. (Torque the bolt to the recommended
specification.) During the tightening of the bolt, the large washer will flex allowing the clutch
to be tight enough without damaging the clutch bushing.

Option 2: L0206 Running a Bully Conversion Kit
 Acquire a Hilliard Bully Conversion Kit from your dealer. (Not
included with this clutch.) The conversion kit allows you to use the “Bully” style sprockets,
needle bearings, and inner race that is used in place of the bronze bushing that is included with
this clutch.
 Install 2 small washers first.
 Install the bearing race to the crankshaft.
 Slide the bushing/sprocket drum assembly onto the engine shaft. Making sure that the needle
bearing is over the race.
 Install the Large washer.
 Slide on the hub/shoe/spring assembly on the engine shaft. The key in the hub will need to be
lined up with the keyway on the crankshaft to get the clutch to slide on completely. Make sure
the shoes and springs are inside the drum and the cover is toward the outside of the clutch.
You should be able to read the warning information on the face of the cover when it is
assembled properly. The shoes should be fully enclosed under the drum when installed
properly. Please contact your clutch dealer if you are not sure if it is assembled correctly.
Improper assembly can cause serious injury or death.
 Check to insure that the clutch overhangs the engine crankshaft, by .020” – .030”. (If the clutch
overhang is outside that range you need to remove the clutch and add or remove the
appropriate number of spacers (2 are provided with the clutch, and 6 are included in the bully
conversion kit.) to achieve the correct spacing.) Apply the washers to the inside of the
crankshaft. Reinstall the clutch per the instructions, and recheck your spacing before moving
on to the next step.
 Install a bolt and retaining washer (Larger than 1 1/16” in diameter). Torque the bolt to the
recommended specifications.
*IMPROPER INSTALLATION/ASSEMBLY CAN RESULT IN SERIOUS INJURY*
For any additional support visit www.infernoclutch.com or contact your dealer.

Springs can be alternated. For example, reading around the clutch, white black white black, or any
combination of colors. Keep balance in mind. As long as the springs that are opposite one another
are of the same color, balance is retained.

All of the components within the Fury clutch interchange with the Blaze/Blizzard racing clutch. The
Blaze and Blizzard racing clutches contain shoes that are tunable by adding/removing weights and
by orienting in a leading/trailing shoe rotation. You can purchase the adjustable shoes for use in
this clutch if you would like to upgrade your clutch with the unlimited tuning capability of the
Blaze/Blizzard racing clutches.

Balancing is the most important feature to keep in mind. If you change the weight of one shoe,
then the shoe that is opposite it (180 degrees apart) MUST also be the same weight. Opposing
shoes must run the same orientation as well. If you have a leading shoe then the shoe that is
opposite it (180 degrees apart) MUST be in a leading shoe orientation as well.
Heavier Springs = higher engagement speed Weaker Springs = lower engagement speed

 Springs can be alternated. For example, reading around the clutch, white black
white black, or any combination of colors. Keep balance in mind. As long as the
springs that are opposite one another are of the same color, balance is retained.

Insert Weights for tuning torque, engagement, and configuration.
 These are optional, and not required for the clutch operation.
 The more weight that is added to the shoe, the lower the engagement.
 The more weight that is added to the shoe, the higher the torque capacity.
 The placement of the weights allows engagement properties to change. Moving the
weights from one end to the other will affect the configuration, making it more
leading or more trailing, or making it more center balanced.
 NEVER REUSE THE SNAP RINGS. Once removed, discard, and replace with new.
Shoe Orientation is also tunable and changes the engagement characteristics of the clutch.
 Shoes with a mass in front of the driving lug (the 4 lugs on the hub that drives the
shoes), with respect to the direction of rotation are called leading shoes.
 Leading shoes self energize and carry more torque with very little slip. Leading
shoes often stay engaged with the engine back very close to the engagement speed
before releasing. (More on and off, with little slip.)
 Shoes with a mass behind the driving lug (the 4 lugs on the hub that drives the
shoes), with respect to the direction of rotation are called trailing shoes.
 Leading and trailing shoes can be mixed. You can run 2 leading shoes, with 2 trailing
shoes as long as they are opposite each other. This is called the “X” pattern.
Recommended Initial Setup:
As you can see the Blaze and Blizzard racing clutches have a wide range of tuning ability. A suggested
starting point is to put your shoes in a leading orientation, add the heavy weight to the tip of each shoe,
add the light weight to the middle position of each shoe, and then install (4) yellow springs. This setup
will be a good starting point for the majority of racers. This will start to engage around 2700 rpm. After
you test your setup you then can adjust the clutch to your specific needs. Add or remove weight, change
the springs, change to a trailing orientation, or a combination of the adjustments.

Follow the recommended weekly maintenance for the best performance and longevity of this
clutch.