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| The Hymark Performance ball bearing clutch
systems are the finest most durable and precise shifting driven clutch systems available!
We continually test and refine our products 12 months out of the year. This insures that
our customers get the very best products that money can buy. What we have found through years of testing in the snow and
running our dune buggies in the summer months in the sand is that in our near friction
free ball bearing clutch systems, the helix angle selection is not near as important as
the spring used. This is one reason that our spring selection is large and the reason for
the reduction of helix angles manufactured for this 1998 snowmobile season. Another reason
is that one can purchase five springs for the price of one helix and have greater
tune-ability.
Through continued refinement and testing
Hymark Performance has narrowed the helix selection to three basic helix angles, 45, 47.5
and 50 degree angles. We still have a large selection of helix angles available that are
in inventory. |
WE NOW HAVE TWO CLUTCH
SYSTEMS FOR THE YAMAHA REVERSE CAM CLUTCH |
1. BOLT-ON SYSTEM: This system is a completely bolt-on system. (There
is no machining required.)
The system includes a helix, helix carrier, Three bearing carrier assemblies, and a
spring.
This system is designed for 500cc snowmobiles and smaller. |
2. MACHINED SYSTEM:
This system requires you to send your secondary
sheave to us for machining.
The system includes a helix, cover plate assembly, and a spring.
This system is designed for high horsepower sleds, or race applications. |
HYMARK BALL
BEARING CLUTCH SYSTEM
(Bolt-on system) |
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| Hymark Performance is now in the second
year of production of our bolt-on ball bearing driven clutch system for the new Yamaha
reverse cam clutch. Our bolt-on system for the Yamaha has under gone numerous
changes to refine this clutch system. We have changed the helix cover by adding a radius
between the towers to give added strength, this eliminated the cracking that could occur
with highly modified engines. We have also tapered the bushing hub area that positions the
inside of the spring. in order to eliminate spring binding, around the bushing hub. And we
have also been refining the bearing carrier, From the pin design to the material being
used. Continually trying to increase the roller clutch life on the higher horsepower
sleds. |
BALL BEARING
CARRIER
(Bolt-on system) |
| The Hymark Performance ball bearing
carriers for the Yamaha driven clutch are very unique in design. The bearing
carriers are made of 4140 chrome molly and are zinc plated to prevent rusting. Ball
bearings are installed in the bearing carriers by means of dowel pins. The bearing carrier
assembly installs in the machined locations of the stock clutch where the original clutch
buttons were located. Three bearing carrier assemblies are required per clutch.88-SMBOO374A: Bearing Carrier Assembly
88-D2220-20PS: Replacement Bearings |
YAMAHA
HELIX CARRIER
(Bolt-on system) |
| The Hymark Performance helix carrier is
machined from 6061 billet aluminum for precise balance and strength. This helix carrier
allows one to mount our hardened steel helix to the stock clutch with no machining
necessary. This Hymark helix carrier is red anodized to give the clutch a great looking
appearance. 88-SMB00376:
Helix Carrier |
MACHINED
ROLLER CLUTCH SYSTEM |
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| Hymark Performance is now
producing a machined roller clutch system, for your high performance and race sled
applications. In this system you can use our original single ramp helix or our new double
ramp helix. The double ramp helix incapsulates the roller so that when you grab the brake
hard or come off a jump, the clutch never slams open and closed. This eliminates the
chance of the roller losing contact with the helix thus making the clutch even more
sensitive and faster reacting. With this system you will need to send the secondary sheave to us for machining.
We will machine the sheave so that you can bolt our hardened steel radiused helix to your
sheave. Then you merely install the spring, position the cover assembly over the three
bolt towers and tighten the nuts. With our new cover you now have even more spring
tune-ability, with the three original spring holes in the sheave and the five new holes in
the cover assembly. |
YAMAHA
COVER ASSEMBLY
(Machined system) |
| The Hymark Performance cover assembly is
machined from 6061 billet aluminum for precise balance and strength. The cover comes
complete with the bearings and bushing installed. This cover allows you to bolt our single
or double ramp helix onto your Yamaha machined sheave. The Hymark cover assembly is
black anodized, with silver lettering to give the clutch a rich looking appearance. 88-SMB00407: Cover Plate Assembly
Maching Yamaha Sheave |
YAMAHA
HARDENED STEEL RADIUSED HELIX |
| The Hymark Performance helix is a hardened
steel single point contact radius helix. A roller bearing clutch must have a radiused
surface for the roller bearing to contact. This will ensure center contact of the roller
bearing surface throughout a variety of helix angles. Hymark Performance has developed a
series of helix profiles with our patented radiused contact surface. These helix are
machined from high quality steel and heat-treated to near bearing hardness. Even though
the radiused helix is made of high quality steel, the special design adds only ounces to
the driven clutch. These helix are designed to last a lifetime. 88-A/C45: Helix
88-A/C47.5: Helix
88-A/C50 : Helix
88-AC/YAM45 : Double Helix
88-AC/YAM47.5: Double Helix
88-AC/YAM50 : Double Helix
NOTE: Other
helix angles available upon request. |
YAMAHA
HELIX APPLICATION CHART |
| 88-AC/YAM50 Degree Helix |
0 TO 4000 ft. elevation |
| 88-AC/YAM47.5 Degree Helix |
4000 TO 8000 ft. elevation |
| 88-AC/YAM45 Degree Helix |
8000 TO 12000 ft. elevation |
| NOTE: Three bearing carriers, one helix carrier,one
helix, one shim pack and one spring are required per clutch. |
HYMARK
DRIVEN CLUTCH SPRINGS |
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| Hymark Performance has
developed several new springs for our ball bearing clutch systems. We have also developed
spring torque charts and spring compression charts in order for one to more fully
understand which spring or springs would be desired. In most of the new Yamaha
driven clutches, we would recommend the use of our 88-HY201W spring or the 88-HY192Y
spring. 88-HY188P: Spring .188" wire diameter
88-HY192Y: Spring .192"
wire diameter
88-HY201W: Spring .201"
wire diameter
88-HY206G: Spring .206" wire
diameter |
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