Attn: Clutching Guys

Ding

Ding

Darn Tootin'
Joined
May 8, 2003
Messages
3,603
Age
63
Location
Howell, MI
Chime in with your thoughts on the following clutch weight switch . . .

I have been studying the clutch weight charts trying to compare how . . .

8EK weights loaded (17.2/17/2), 14.5 mm rollers and a Y-W-Y spring

line up with . . .

8DN-10 weights light(none/10.3), 15.6 mm rollers and a G-W-G spring

I need to get a starting point to tune from.

Let me know what you think about these 2 setups.
 
Last edited:
Thanks for the input Tom, I am open to any ideas. I will look at this on the chart too . . .

Right now I am trying to determine the basic difference across the rpm range of the 2 setups. Obviously the secondary setup will affect the overall sled perfromance, but I want to figure out how the combination of weight, rivets, rollers and springs compare on the primary side alone. The loading chart from Yamaha has these 2 weights (and the 8DN-20 for that matter) on the same chart, so it makes it easy to compare the weight by itself. I just wanted input from you guys with more clutching experience than I have to share your thoughts.

I see that Yamaha uses the 8DN-10 with larger rollers on the Mtn Viper. I am guessing that this is too provide a less agressive shift-out in an effort to keep track spin out down and lessen the tendency to trench in deep snow. I believe the loaded heavy hitters I also have would be even worse for trenching.

Anybody got any input? Not looking for a full setup, just your thoughts on how these setups compare . . .
 
I dont think the 20's will have an adverse affect on perfomance since they are the same exact profile as the 10's and the 20's appear to be a touch heavier possibly for a little better shift and top end. I would try to tune any Yammi tripple 2 stroke to run these weights. Have them in my SRX and love them on the trail. I think I would start out filling the 20's with 4.5 rivets and tune the secondary from there but its up to you.
 

Attachments

  • 08weight2.jpg
    08weight2.jpg
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Drawing was created directly from the CAD program that generated the machine code I guess. The 8EK is newer than the others.
 
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