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DPSS

DPSS

Dalton springs are well known for durability and are manufactured from high quality materials and processes. .

As always, we try to produce a range of components for snowmobile clutch tuners.

The Red (DPSS-YMR) secondary spring has been hugely popular with some of the Yamaha tuners on Apex and Viper models, in both normally aspirated and boosted versions, and has been a part of numerous clutch kit and group packages for shops that tune these models in various forms. There are a couple of new options.

The Pink/White (DPSS-YPW) is a variant of the Red that has less initial compression than the Red YMR spring, but still more compression and less torsion than the factory Yamaha pink spring.

The Black/Orange (DPSS-YBO) is a spring that was based on the characteristics requested by owners and tuners of the Sidewinder turbo model. Spring 2017 initial tests on the prototype springs showed that when installed it ran similar RPM to the stock secondary spring, but that the more initial side pressure showed some desired characteristics of quicker RPM and better belt grip on initial take off.

All of the following Dalton spring options will shift fully with no coil binding in a stock secondary.

A secondary clutch spring is only one tuning component and is always relevant to the rest of the whole set up which includes the different helix options, primary components, track type, HP level, gearing, etc.

Thorough testing will always get you the most performance for your own application, but we know that is not always easy for everyone. It is best if comparing notes with others to ensure that you have as much info as possible to compare.

Most who are familiar with our company know that we do not make “kits” or clutch tuning recommendations for snowmobiles. We supply individual tuning components to those companies that do, and for those who really do it themselves.

The following chart gives some additional information:

Product Specifications

Product Name:

Yamaha Secondary Spring

Type:

Secondary Springs

Model:

DPSS

For :

Yamaha

Suggested list price :

CAD $32.00 / USD $29.95

Introduced:

Sep 2017

Additional Notes:

   Torsion Value*        Compression Loads***      
  to 70 degrees** number coils Wire dia. Free Length @64mm @49mm @39mm Part#
Yamaha Silver (Vmax 4, etc) 8 kg 4.86 5.5 mm 75 mm 12 kg 27 kg 38.5 kg 90508-556A7
Yamaha Pink (RX/Apex) 10 kg 5.53 6 mm 75 mm 10 kg 23 kg 40 kg 90508-60012
Yamaha White (long track/Mtn versions) 12 kg 5.2 6 mm 75 mm 10.5kg 25 kg 41 kg 90508-60007
Yamaha Yellow (Sidewinder) 11 kg 5.53 6 mm 80 mm 17 kg 32.5kg 54 kg 90508-60020
                 
                 
Dalton Red 8 kg 4.86 5.5 mm 90 mm 22.5 kg 34 kg 45 kg DPSS-YMR
Dalton Pink/White 8.5 kg 4.86 5.7 mm 85 mm 19 kg 29.5 kg 45 kg DPSS-YPW
Dalton Black/Orange 8.5 kg 4.86 5.7 mm 100 mm 31 kg 43 kg 52 kg DPSS-YBO

Note: spring free length does not include the tang.

* Torsion Value -Torsion was tested when compressed to 64 mm height, and with a 125 mm length arm for rotation pressure.
There are many variables in this type of test to keep consistent values. Factors like friction in the test apparatus, location of the pressure reading devices, etc. 

** Arm rotation to 70 degrees, which is approximate to where it sits in the clutch when the spring is set on 6-1 tang settings. This test does not exactly represent a clutch setting or anything other than a way to directly compare springs in a consistent method. 

*** Compression loads - Loads tested at three test height intervals for comparison of how the spring acts as compressed. The 64 mm represents the approximate height of the spring installed in the stock sidewinder clutch with stock helix at rest ( actual 64.7), and 39 mm represents the total depth of the spring pocket when fully shifted to the stop with no spring (actual 38.5 mm).


Please note: The above chart was created in house to make a simple comparison of Dalton springs to some of the known Yamaha springs that clutch tuners are familiar with. We have found that some factory spring charts are confusing, and sometimes inaccurate. This chart does not relate to any chart from Yamaha or any other aftermarket supplier. At the time of this writing, we find there is a lack of information in the market for aftermarket Yamaha secondary springs. The descriptions are sometimes vague. We are simply providing more information that we hope some clutch tuners may find useful.

FAQ: When comparing secondary torsion springs, which is more important ?  Is it compression or torsion, or both?
Answer- Both. It is two different things and both should always be considered. It is part of successful clutch tuning to prove your own efficiency with many combinations.
FAQ: I have some other springs I may use in testing. How can I compare other springs to this chart?
Answer- We are sure there are lots of other options out there that may be tried. There are lots of variables like number of coils, free length, wire diameter, etc. Field testing and tuning will be your way to show what works best for your own situation. We are not concerned with testing or trying to show all other options, we set up and created this test to show comparison of our Dalton springs to some factory Yamaha options.