Yamaha clutches.... XYR in most??

Waterfoul

Waterfoul

New member
Joined
Dec 13, 2004
Messages
745
Age
58
Location
Grand Rapids, MI
Until you get up to the 4 strokes, do all yamaha sleds have this XYR clutch? I'm kinda surfing around looking at clutch kits and Heel Clicker has a pretty decent SOUNDING kit for the XYR clutch. Direct bolt in.
 
Yamaha uses only the YXR clutch as of now. Heelclickers are used alot for the guys that like to drag race. I have never used them, but from what I have heard they take more tuning time and it seems you have to stay on top of them more...tuning for conditions. Are you tuning the sled you have listed, the 600 XTC? If so those were clutched a bit light compared to the 600SX. Try running the SX weights with a spring around 50KG preload and around 110KG shift force, a multi helix of 47/43 works good too with around 50-60 deg. twist. Also the 600 XTC has a 1.4mm head gasket. Go with a thinner one around .6-.8mm thick and run only premo fuel. The head gasket will really wake that motor up. The stock track on that sled is not too good either. I'd look into a lighter, grippier Camoplast. Huge difference from that .75" Yoko those came with. I used to run a '97 600SX and had alot of ride time and experience with that motor package. Mine was very fast for a 600 in it's day.
 
journeyman said:
Yamaha uses only the YXR clutch as of now. Heelclickers are used alot for the guys that like to drag race. I have never used them, but from what I have heard they take more tuning time and it seems you have to stay on top of them more...tuning for conditions. Are you tuning the sled you have listed, the 600 XTC? If so those were clutched a bit light compared to the 600SX. Try running the SX weights with a spring around 50KG preload and around 110KG shift force, a multi helix of 47/43 works good too with around 50-60 deg. twist. Also the 600 XTC has a 1.4mm head gasket. Go with a thinner one around .6-.8mm thick and run only premo fuel. The head gasket will really wake that motor up. The stock track on that sled is not too good either. I'd look into a lighter, grippier Camoplast. Huge difference from that .75" Yoko those came with. I used to run a '97 600SX and had alot of ride time and experience with that motor package. Mine was very fast for a 600 in it's day.
Click to expand...

I've already upgraded the track. 1" viper track with 144 pics (got it used cheap from a local TY member). I'm really just trying to set it up for spirited trail riding... not looking for the almighty top end number.
 
A few questions I hope can be answered before we leave:

Tighter primary spring raises engagement rpm I know... but what does it do to shifting on the fly? Like when exiting a corner? What does it to to top rpm? Top speed?

Secondary spring... wind it tighter... what does this do to rpm? Shifting?

As for the weights... if I add the heavier rivet to my 8cr weights I'll be at 47.9g total weight... the 8ab with the 600sx rivets would be 48.2g total weight. So I'm .3g lower... pretty close.

Guess we'll just have to play with it when we get there. Hope there is snow!
 
Waterfoul said:
Anyone care to take a stab at the questions above?
Click to expand...

You may want to relist in an SOS to Turk. He's the clutch wizard and is pretty good about answering questions directed to him.
 
I feel like I've asked Turk enough questions... I'm sure he has other things to do than sit on the computer and answer my questions all day... :cool:

As it is, those are pretty basic questions in post #5, and I figured there would be quite a few guys here that know more about clutches than I do. I'm trying to learn!! ;)!
 
Waterfoul said:
A few questions I hope can be answered before we leave:

Tighter primary spring raises engagement rpm I know... but what does it do to shifting on the fly? Like when exiting a corner? What does it to to top rpm? Top speed?

Secondary spring... wind it tighter... what does this do to rpm? Shifting?

As for the weights... if I add the heavier rivet to my 8cr weights I'll be at 47.9g total weight... the 8ab with the 600sx rivets would be 48.2g total weight. So I'm .3g lower... pretty close.

Guess we'll just have to play with it when we get there. Hope there is snow!
Click to expand...

A higher force primary spring preload will increase the engagement rpm. I higher total force will increase shift rpm and top end rpm. When you stab it out of a corner it will act like its in a lower gear (downshift) and rev higher. Speed will depend on the exact setup.
Winding the secondary spring tighter will slow the upshift and grip the belt tighter. Tighter wind will raise rpms. You should not change secondary spring wrap to change rpms, because it is taking the system out of balance.
About being close with the weight, although it is a good rule of thumb to start off at the same weight when you change weights, profile also has A LOT to do with how the clutch reacts to the new weights. A more aggressive curve will upshift faster and bring down rpms, and vice versa.
 
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