SECTION 06 - DRIVE SYSTEM
MMC2005-001_06A.FM
06-13
TRA III
Some 2004 models come equipped with a TRA III
style drive clutch. They include most models with
the 600 and 800 cc engines. This style of clutch is
the “next” generation of engineering develop-
ment from Ski-Doo and will certainly be used in
more models as years go on.
Visual comparisons between the TRA and TRA III
styles may appear slight, but in fact, there are
many differences, and when you are working with
it, you need to be aware of the differences.
VSA
The TRA III has Variable Sheeve Angle (VSA). The
machined angle of both sheeves varies from 12
degrees at the bottom to 14 degrees at the top.
This provides better efficiency through out the en-
tire range of shift. With the improved efficiency,
belt life is also extended. The TRA III clutch must
be matched with a VSA type driven clutch and belt
to achieve maximum performance.
TUNING COMPONENTS
As mentioned earlier, few tuning components can
be interchanged between the TRA and TRA III
clutches. Springs, rollers and some pin weights
can be interchanged. Short pins can be used but
not the heavy long ones, as they will cause inter-
ference. Ramps and arms cannot be inter-
changed. At this time, only one type of arm is avail-
able through Ski-Doo, and that is the production
aluminum. However, several ramps have been de-
veloped to allow you to tune your sled. Below is a
list of ramps available and how they compare to a
TRA ramp.
TRA III
P/N
TRA EQUIVALENT
410
417 222 596
299
411
417 222 514
299
412
417 222 515
293
414
417 222 546
300
415
417 222 548
300 less load at
beginning
417
417 222 552
293 less load at
beginning
419
417 222 557
414 with
engagement notch
Содержание ski-doo MACH Z 1000 SDI
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