What did you order?

[kylechargerrt]

Approach angle and geometry I believe. 137 engages into snow flatter I believe. (Correct me if I'm wrong

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[SideHogger]

Approach angle and geometry I believe. 137 engages into snow flatter I believe. (Correct me if I'm wrong

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I was told it also had something to do with turning the longer track compared to the shorter 129. Supposedly more efficient with a 137. Can anybody explain this?

 

[AXR]

Approach angle and geometry I believe.

I agree as well. All in the angle of the dangle

 

[Sledroll]

I agree as well. All in the angle of the dangle

less slippage .

 

[SideHogger]

less slippage .

Is the 137 going to be able to transfer weight? That's my biggest concern from not getting a 129. I've only ridden one 137 a 2014 Viper and rode nice but seemed not to transfer.

 

[uprider800]

The reason I went with the 129 in The Sidewinder is because the 137 just doesn't transfer enough for my liking.

 

[Sledroll]

Is the 137 going to be able to transfer weight? That's my biggest concern from not getting a 129. I've only ridden one 137 a 2014 Viper and rode nice but seemed not to transfer.

I believe the transfer is dependant on the shock calibrations .
4 inches of additional track on the ground should not have much / any effect on transfer .
When I test rode a 14Viper , I was not impressed in the ride , even after trying to make it as soft as it would go .
I am not concerned with the SW , particularly the 137 LE , as it should be awesome !

 

[uprider800]

Well I ran my 14 xf 9000 with 230 hp and revalved shocks and still the transfer on trail rides was less than stellar. I ended up riding all last season with the transfer bar completely out to get the transfer I wanted.

 

[DranttelSS]

Looks like a very small percentage of us will be riding XTX 137's next year. Gonna be a long summer waiting for mine to show up!

 

[Snowaddict]

Looks like a very small percentage of us will be riding XTX 137's next year. Gonna be a long summer waiting for mine to show up!

That was the decision I toiled over for a couple of weeks LTX LE vs XTX LE. Basically, it came down to rear shocks and ability to stud the track. LTX LE won out. I don't think you can go wrong either way, though.

 

[super_rash]

i think longer tracks hook up better and this is necessary for transfer to occur, so IMO, the 129 doesn't transfer better, because of lack of traction

 

[Fleecer]

He is correct,the 137's are faster than the 129's,and not just hook up,top end,all the sleds that posted speeds of 122-124 were 137's there is a vid of cats thundercats new 17 vrs 9000 zr turbo and there is 8-10 sleds between the two,and they stated the old zuk was 115-117 tapped out,the new thundercat 122-124 and will have lots more with gears.

I beg to differ here and if I may, would like to share my 5 cents.

I traded a 2013 f1100 sno pro 129 for a rtx se 129. The reason I went 129 is because in my experience when comparing cats, the 129 in my testing has been faster topend. My cat had a D & D stage 1 quiet pipe (10 hp), the front clutch shimmed, and a 52/38 helix. I raced various cats of different track lengths and setups and beat them all. From a dig in powder, the longer track will get the holeshot, but at 75mph I pass them. On the hard pan, my short track was very competitive on holeshot and then would walk away.

My brother has 12 apex xtx bone stock. We raced dozens of times and my 129 would pull him lowend, midrange and topend. And it should as the cat made 25 more horsepower.

I have a friend with a viper 137, hurricane turbo, pipe clutched, geared, which he states makes 190hp. Many races and my 129 cat would pull more topend mph.

My obsessive compulsive disorder requires me to purchase the absolute fastest sled made, so I bought 129 rtx se based on my findings.

Two weeks after my purchase, my dealer informed me that there would be demos at his shop: Garys Yamaha Caribou. Even though the deal was done, I went over to drool over the new sleds. While talking to the rep, he informed me that the 137 sidewinder was faster than the 129. My heart sank as I already committed to a 129. Then he went on to say that the 141 was faster than the 137. I said, "Your kidding me!!!" He said nope....."The longer the track, the faster the sled goes." So I said, "The fastest sled here is the MTX 162?" And he replied, "Yes, the longer the track, the faster the sled." I thought hmmmmm someone doesn't know what he is talking about.

I left and went home to find my trusty 2013 turbo sno pro still in the garage. (Dealer asked me to store it till fall.) I fired it up, took it to the rail bed and did two runs back to back at 128 on speedo. Sidewinder 137's claim 124 speedo. I reached out to my cat dealer for his opinion and asked which track length in his experience was faster. He told me 129 and stated you'll never get a 137 up to 128mph on the speedo without a programmer.

These are my findings and opinions and thought I'd share.

 

[uprider800]

i think longer tracks hook up better and this is necessary for transfer to occur, so IMO, the 129 doesn't transfer better, because of lack of traction

The longer track will hook up better but doesn't transfer better. I spent the last 3 yrs on a 137 and when I rode my buddies 235 hp 129 cat it definitely transfered better. The 137 will not pull the skis hardly at all in the trails. Now some people like that but I want a sled that is still playful in the trails. The 129 is definitely more playful in the trails. We ride hard packed groomed trails and we stud our sleds and in these conditions the 129 shines. With the 137 you ride hard into a corner and punch the throttle coming out and you will get next to no ski lift and if you do this with a 129 you will hang the skis down the trail. I'm not sure why this is but from my 3 yrs experience on a 137 it's the case. By all means the 137 is a great length and has lots of advantages but playful in the trails isn't one of them.

 

[Fleecer]

The longer track will hook up better but doesn't transfer better. I spent the last 3 yrs on a 137 and when I rode my buddies 235 hp 129 cat it definitely transfered better. The 137 will not pull the skis hardly at all in the trails. Now some people like that but I want a sled that is still playful in the trails. The 129 is definitely more playful in the trails. We ride hard packed groomed trails and we stud our sleds and in these conditions the 129 shines. With the 137 you ride hard into a corner and punch the throttle coming out and you will get next to no ski lift and if you do this with a 129 you will hang the skis down the trail. I'm not sure why this is but from my 3 yrs experience on a 137 it's the case. By all means the 137 is a great length and has lots of advantages but playful in the trails isn't one of them.

I agree, nothing funner than hitting a knoll at 100 mph and hanging a wheelie.

 

[AXR]

In theory the 137 should be faster due to approach angle. It has a flatter angle. So you are sending that power to the ground and not up that steep angle of the 129. The 137 should be faster from the start for 2 reasons less ski lift and better hook-up. In drag racing you don't want the sled or car or whatever to lift the front end off the ground. All that is is wasted power. Up is not forward. The MTX could not be faster no matter what length it was due to it's gearing. Also I doubt the 129 or the 137 can see 128 without a gear change. So in the end don't expect much more then 124 w/out doing some work and when it comes down to having work done there is always someone out there with more.