Improve on ProMountain, Nytro, Apex skids

zoombyu · Sep 14, 2009

Anyone try a 153 Nytro skid in a Viper Mtn? I am considering swaping a ProMountain 144 to Nytro 153. Pros, cons. I know the ProMountain 144 has a lot of sag when sitting. It would seem we loose a lot of usefull suspension travel with just the amount of sag we have. It would appear that most skid upgrade suspensions are largely do to what they use for shocks as well as light weight parts and slight geometry changes. Can we get part way there by just a shock upgrade (ex.-Fox Floats)? What works and what doesn't?

So many questions, so little time!!!!

MtnMaxMod · Sep 14, 2009

i believe anything is better than that pro action skid.

right now i'm running the MPI Transfer Enhancement kit, and just that alone made it a whole new sled.

best $50 i ever spent

zoombyu · Sep 15, 2009

ProMountain was a change from the ProAction. Just looking for ways to improve without spending big bucks. Looking for experiences from others that have tried different things, including putting a Nytro skid in a Viper Mtn. That would take me to a 153. I have heard a 151 even helps on the Viper Mtn.

MtnMaxMod · Sep 15, 2009

zoombyu said:
ProMountain was a change from the ProAction. Just looking for ways to improve without spending big bucks. Looking for experiences from others that have tried different things, including putting a Nytro skid in a Viper Mtn. That would take me to a 153. I have heard a 151 even helps on the Viper Mtn.

oh oops, sorry lol, dunno how that one got past me.

well let me know how things work out! i'd like to swap a different skid under my sled too.

TOM WRIGHT JR · Sep 16, 2009

I just installed a 08 nytro mtx skid in my 2000 mtn max, I used the factory stock holes in the front of the mtn max (to keep the approach angle the same) , and built new drop brackets in the back, NOTE installing the skid the way I did you will need to get a 159 track or shorten the rails in the back. It looks good, but when the snow fly's I will know if it was worth the 10# weght savings.

zoombyu · Sep 26, 2009

Anyone put fox floats or similiar on a Promountain skid (Viper, Nytro, Apex)? I would only need rails to extend skid (144") on 05 Viper Mtn.

kcjohndeere76 · Oct 17, 2009

nytro skid in M.M.

I put a 08' Nytro skid in my 99' M.M.with a Elkolm tunnel and a 151" track. I had all of MPI light weight parts in my old skid along with the transfer kit. The Nytro skid with the wheels removed and ice scratchers is 2 lbs lighter than my old skid.
The biggest advantage I have found is how much better it rides and transfers in the snow. I copied the mounting points off of a Nytro and I had to move my rear suspension bracket. I had enough adjustment with the rear wheels to fit the 151" track. I found a new skid for $300 on the suspension forum.

akhammer · Oct 17, 2009

I got a full 09' Nytro skid for sale if you're interested. let me know I'll sell for cheap.

dirtjumper895 · Oct 17, 2009

Ever thought about a M series Cat Skid? I just installed a 153 M7 Skid, in my viper mtn (144), with relocated bracketry running a 162" track. Took about 10 hrs, including some light/fairly simple machining. The best part is not only do i have a skid that transfers, i saved about 30lbs in just the skid. The 153 skid is approx 47lbs..

350xryder · Oct 17, 2009

I going to install a nytro skid in 00 MM700 soon and would like any helpful hints. I most concerned with ride height and weight transfer. I plan on copying the nytro mounting points.

zoombyu · Feb 1, 2010

Finally got the Nytro suspension in with a 153 x 15 x 2.25 x 3 pitch Cat takeoff installed. Here is what I found. Direct bolt in with the suspension. Changed to 3 pitch drivers with extros. When I pulled chaincase cover, I found out the magnet at the end of the oil dipstick had fallen off and got chewed up. Dirty oil and magnet shredded. I had to change top bearing (the one without the seals) in chaincase cover. Had to clip about 1/8 " off all the lugs to keep from hitting front cooler. Tinsnips work fairly well to snip off ends. 2" lug would have been better. Did not extend tunnel yet. After riding this weekend, a couple of issues. We had to put rear of suspension in lower hole on stock bracket. It wasn't quite enough unless I change in the tunnel extension. Track catches rear of tunnel and is close to the rear cooler when compressed. Set the suspension to hard to try to keep from bottoming, so ride was harsh and it still bottomed. Need to get tunnel problem solved to start playing with suspension settings. The good is, I can definately tell I have more track under me. I would have been stuck numerous times with the 144" vs the 153" in the snow we rode during the weekend. It bites better on hardpack too. I will try to post some pics when I get them taken.

zoombyu · Feb 6, 2010

After closer inspection of skid, I believe if I take off the big wheel kit on rear of skid and return to stock wheels, I may have enough room to solve problem with hitting rear of tunnel. I should gain 1" of clearance by going back to stock rear wheels. Big wheel kit was from AC, so rails were slotted larger to make fit. I will have to get some larger bushings or AC bushing adjusters to fit slots in order to make stock rear wheels work.

zoombyu · Feb 10, 2010

Got the stock rear wheels in. Made some bushings for the enlarged slots out of brass bushing stock so they would not rust. When the suspension is fully compressed it looks as though it will just tick the rear of the tunnel extension. Won't have time to do much more, as we leave for Island Park on Monday and still need to clutch and jet. Will give it a ride tomorrow and see if I still have a problem. May eventually have to go to different drop brackets or tunnel extension, just don't have the time right now.

dirtjumper- I did consider an AC skid and may end up there if this doesn't do what I want. If you have some pics or dimensions of relocated AC skid, the info would be appreciated by many. This just seemed the quickest easiest way to lengthen as I had access to the Nytro skid and looked like an easy bolt in. The only difference I can see between the 05 Viper Mtn and Nytro Mtn skids are the rails are longer and the spring may be different.

zoombyu · Feb 11, 2010

Still not enough clearance to tunnel extension. Looks like I will have to do something with the drop brackets or tunnel extension. ARGGGGG!!!!!! I also notice a vibration when on the flipper hard. Thinking it may be the extros. Anyone pick up a slight vibration when switching to extros?

bdoe22 · Feb 11, 2010

it is normal to get a little vibration when putting brand new extros on. they should wear a little and the vibes will go away.

zoombyu · Feb 13, 2010

Still messing around with suspension. I built extensions for the drop brackets to lower it enough to miss the rear of the tunnel extension. Still not happy with the way it sits. I am beginning to see that the tunnel extension will have to be changed to allow things to fit the way they should. I have let out the front limiter straps as far as I can and the skid still does not sit the way I would like. It has to much pressure on the rear of the skid. It works, but just not the way I would like. Maybe I will be pleasantly surprised when it hits the snow. When I find some time, I will begin working on the tunnel extension. I will have to ride like it is in IP this coming week and try to have the tunnel taken care of before Spring Break as we plan on riding again after a couple of days of sking at Bridger.

zoombyu · Mar 22, 2010

Have had some time on the sled and want to give my current assessment. Climbs pretty good with the 153. Need a stronger rear spring because as it sits now, I bottom out too much and get beat to rubber leg street on the ungroomed trails. Still need to do the tunnel extension. I am torn on raising suspension back up into the tunnel after gaining the running board clearance and may see how a stiffer spring may help with the ride. I may try to get to the lower hole on the stock drop bracket if I can. Wish Yamaha would have put a tapered tunnel on the Viper MTN. If anyone else has done or tried this, PM me and we can compare notes.

zoombyu · Oct 27, 2010

Anyone who built there own tunnel extension for a Viper Mtn willing to share their experiences?

RX-1MT · Oct 29, 2010

I have a brand new hartman I can sell for $150.00 plus some shipping.. Did that skid bolt right in?

zoombyu · Oct 31, 2010

bolt in?

See post #11 about bolt-in. Here is a pic of how I temporarily dropped suspension.
Suspension swings slightly forward, hence the bolt position.

Improve on ProMountain, Nytro, Apex skids

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