LTX-LE Break in time, top speed and top RPM

[Snowaddict]

8800-8850 consistently after 800 miles. Original belt 1500 miles. Still in great shape.
Pulls like freight train. Bone stock. Beats 800 axys ,doos 850,and new cats 800 by 15-20 sleds. No 2 stroke is in the game. You must have something wrong.

Excellent! What's your top speed on speedo?

 

[actionjack]

Correct,this motor wants to run 8700-8800 stock,so why would any one wonder why there sled that only runs 8200-8400 rpms,you are losing so much top end when you are down 400-600 rpms for top end speeds,start checking stuff out,and it may not even be in the clutching.

Agreed. Pretty sure my 1.6 track is holding me back at 8400 so I got my belt higher and twisted secondary to 70. Hope that gets me more. Even at 106 on lake I easily outran '06 and '13 Apexes from roll on.

 

[GlennM]

8800-8850 consistently after 800 miles. Original belt 1500 miles. Still in great shape.
Pulls like freight train. Bone stock. Beats 800 axys ,doos 850,and new cats 800 by 15-20 sleds. No 2 stroke is in the game. You must have something wrong.

Exact same for mine! No issues at all!

 

[JestersYamacat]

I just picked up an LTX-SE just over a week ago and after thrashing it hard on the trail for 50 miles, I hit the lake and thrashed it hard and had several runs to 116-118 on the speedo with an indicated 112 on the gps. I beleive in breaking them in hard and I have always had a strong machine. This one will be fast as it was still climbing slowly at those numbers but i was running out of stopping room. I do not have studs as well and in the conditions would have been helpful. I placed shims under the secondary towers before I even hit the snow and I am not binding in the secondary but I do see some marking on the primary spring from coil bind that will no doubt be an issue. I picked up a clutch kit from XYZ that has dalton weights and spring for the primary that i will hopefully try out this weekend. Like the many cats I have owned, I think the clutches need some milling work to the pockets to ensure the springs are not binding and are allowed to move freely. The secondary spring has one too many winds and if we would find one with less coils with similar rates I think it would be perfect. I also think that the angle in the secondary could have a slightly higher initial angle to raise RPM and help trail corner to corner. That is my theory until I can find an angle that works. Start with primary first and then go from there. Jester

 

[jonlafon1]

I just picked up an LTX-SE just over a week ago and after thrashing it hard on the trail for 50 miles, I hit the lake and thrashed it hard and had several runs to 116-118 on the speedo with an indicated 112 on the gps. I beleive in breaking them in hard and I have always had a strong machine. This one will be fast as it was still climbing slowly at those numbers but i was running out of stopping room. I do not have studs as well and in the conditions would have been helpful. I placed shims under the secondary towers before I even hit the snow and I am not binding in the secondary but I do see some marking on the primary spring from coil bind that will no doubt be an issue. I picked up a clutch kit from XYZ that has dalton weights and spring for the primary that i will hopefully try out this weekend. Like the many cats I have owned, I think the clutches need some milling work to the pockets to ensure the springs are not binding and are allowed to move freely. The secondary spring has one too many winds and if we would find one with less coils with similar rates I think it would be perfect. I also think that the angle in the secondary could have a slightly higher initial angle to raise RPM and help trail corner to corner. That is my theory until I can find an angle that works. Start with primary first and then go from there. Jester

Great write up, Agree with your obs. 100%

 

[krm]

thunder products has a 33/35 to help make the motor rev .

 

[JestersYamacat]

thunder products has a 33/35 to help make the motor rev .

Are they using it with a stock spring or something with less coils but similar rates? I am very interested in this as it might help the lazy trial characteristics sometimes. I know Dale from Daltons is working on it and may have something shortly for us. Cheers

Jester

 

[krm]

Are they using it with a stock spring or something with less coils but similar rates? I am very interested in this as it might help the lazy trial characteristics sometimes. I know Dale from Daltons is working on it and may have something shortly for us. Cheers

Jester

stk driven spring .Deeper pocket on helix .

 

[mooser17]

Springs shouldn't show wear marks or rubbing. I've had couple cat turbos , several skidoo and Polaris ' s none of which have had any primary springs rub like the sidewinder. I have to disagree this is definitely a issue and hinders performance!

 

[Snowaddict]

Springs shouldn't show wear marks or rubbing. I've had couple cat turbos , several skidoo and Polaris ' s none of which have had any primary springs rub like the sidewinder. I have to disagree this is definitely a issue and hinders performance!

See discussion on this in broken spring thread (last couple of posts.)
http://ty4stroke.com/threads/broken-primary-springs-keep-eye-on.147910/page-6

 

[kkokko]

Hi Guys, Looking to see how many Km's/Miles before the break in process is complete and top speed can be expected. I've got 300kms on now and top RPM seems to be 8500, I've hit 175km/hr or 108mph. I've been beaten by an Apex and Polaris 800 on top end so hoping that it will continue to improve.I find I could use a little more lug on the track in powder. I was thinking on putting on 1.75" track and wider skis.

Any comments or different setups?

I have 600 miles on my RTX-SE with a 1.25 ice ripper track and it hit 122MPH on a hard packed road and was still pulling at 8800 RPM, just ran out of room. This sled is stupid fast and it is stock, no mods to anything... I did notice that i dont harly have any slides left on the sled. Like 20% left. Anyone else having this problem?? Seems like hardly no miles for the slides to be wore out. Rode on good snow and the track was not tight, set by the dealer and looked correct to me when the back end was up in the air??

 

[krm]

I have 600 miles on my RTX-SE with a 1.25 ice ripper track and it hit 122MPH on a hard packed road and was still pulling at 8800 RPM, just ran out of room. This sled is stupid fast and it is stock, no mods to anything... I did notice that i dont harly have any slides left on the sled. Like 20% left. Anyone else having this problem?? Seems like hardly no miles for the slides to be wore out. Rode on good snow and the track was not tight, set by the dealer and looked correct to me when the back end was up in the air??

That's why they offer dupont slides .Over 1400 miles on mine and they look like new .

 

[cannondale27]

I have 600 miles on my RTX-SE with a 1.25 ice ripper track and it hit 122MPH on a hard packed road and was still pulling at 8800 RPM, just ran out of room. This sled is stupid fast and it is stock, no mods to anything... I did notice that i dont harly have any slides left on the sled. Like 20% left. Anyone else having this problem?? Seems like hardly no miles for the slides to be wore out. Rode on good snow and the track was not tight, set by the dealer and looked correct to me when the back end was up in the air??

There has been a lot of conditions this year especially in mornings where everything is nice and white but top layer is froze just enough to suck for lube. Twice now I saw plastic stuck to the clips after one or two good 100mph runs and that was with the Dupont slides.

 

[Snowaddict]

I have 600 miles on my RTX-SE with a 1.25 ice ripper track and it hit 122MPH on a hard packed road and was still pulling at 8800 RPM, just ran out of room. This sled is stupid fast and it is stock, no mods to anything... I did notice that i dont harly have any slides left on the sled. Like 20% left. Anyone else having this problem?? Seems like hardly no miles for the slides to be wore out. Rode on good snow and the track was not tight, set by the dealer and looked correct to me when the back end was up in the air??

Are you sure they are worn out? Most slides initially wear fast, but then settle in at a certain spot and stay there for a long time. The procross is much better for slider wear than regular yamaha skids. I initially thought my LTX-LE was wearing fast, but upon closer inspection, they've been at the same spot for quite a while now.
Does anyone know the best way to measure wear on the Sidewinder btw? On my apex and vector I used a box end metric wrench (forget which size presently) and it worked well. There are at least 2 lines on the sides of the slides, but I don't think the lowest one is the one to worry about.

 

[swampcat]

Are you sure they are worn out? Most slides initially wear fast, but then settle in at a certain spot and stay there for a long time. The procross is much better for slider wear than regular yamaha skids. I initially thought my LTX-LE was wearing fast, but upon closer inspection, they've been at the same spot for quite a while now.
Does anyone know the best way to measure wear on the Sidewinder btw? On my apex and vector I used a box end metric wrench (forget which size presently) and it worked well. There are at least 2 lines on the sides of the slides, but I don't think the lowest one is the one to worry about.

When the hifax are new, measure to the slide rail, then leave a little extra just in case and scribe a wear indicator line right into the hifax. Some hifax have this line molded into them. I made a tool to scratch this line into the DuPonts.