tunnel icing issue

[old man winter]

does the block-off plate cause any issues with heat under the seat from the exhaust? I have attached a picture of my sled after 150 miles yesterday on the northwoods trails in WI. when it was only 5 degrees F and the trails had just been freshly groomed. The amount of build up made the sled handle/ride like I had a passenger.

I havnt noticed any extra heat under the seat with the block off plate

 

[grizztracks]

I ran the version with wings bent up around the tunnel protectors then later went to a plate fitted between the protectors because I installed a prestudded track. Both versions are equally effective with no heat issues. All you need is a sheet of .05" thick aluminum.

 

[canoehead]

material spec

I believe it was .050 (50 thou)

 

[Tyloooor]

Thanks

 

[Mills]

The picture attachment in my last reply did not come through because it was too large of a file. I think I have it compressed enough to come through this time around. Anyone have this much icing with their Nytro?

 

[old man winter]

That's a lot a ice. I think here where we ride conditions are a lot different(a lot colder and no groomed trails)

 

[Sevey]

I had a glacier form up once almost as bad as that - your block of ice is quite the achievement.

I find the real bad icing starts below -20 degrees C. When the snow gets turned to steam and refreezes it forms hard dense ice and doesnt warm up enough to drop out.

When chunkies do break off and get crushed up in the tunnel it makes quite the sound.

MS

 

[Mills]

This happened on a day when it was about 5 deg. F and riding on hardpack groomed trails. How does Yamaha miss this issue in their testing of new models? I for one think that Yamaha has tried to bring some new designs and innovations to market too quickly which has caused them to have to look past some issues like this and the front suspension geometry. What do you guys think? Back in the day when you bought a new Yamaha sled you got on and rode it without having to have additional money to fix issues like the other brands. It seems its not that way anymore and that the other brands are more dependable out of the box. Sorry but my Nytro has me contemplating a new Polaris right now.

 

[nitris223]

I think the shorter the nytro the worse it gets. We have 2 MTX's and my neighbor has a XTX. We ride the same trail and same distance on the same day. I may ride and jump more then anyone in the group so I may knock a bit more ice off then normal. AT the end of the day when we put them in the heated shop , My sled and the wife's sled don't have enough ice to fill up a normal shopping bag. The neighbors XTX has probably 100 lbs of ice. There is only enough room for the track to turn around. Now he has a under tunnel exhaust so that probably contributes to quite a bit of ice but not that much more then I see on other XTX's.
I always see the XTX and RTX's with ice build up. I was worried about this before we bought the Nytro's. After getting ours home I did a block off plate on mine and nothing on the wife's sled to compare. We both get the same amount of ice in the same places, I didn't bother with a block off plate on her sled..

 

[FX NYTRO XTX 144]

I get a big pile of ice just like that picture. It sucks.

 

[beiter01]

Mills

I also had that much build up under my tunnel. 1st I removed the stud protectors and that helped to the point that you could actually release the chunks from the tunnel.
I was still not happy as that add's a lot of weight and makes the sled hard to ride through end of day trail chop. Purchased the Schmidt Bros tunnel block off plate and
it works! I maybe see a 1/3 of the build up I used to see. Easily kicked off during lunch or side of the trail breaks. As said before I believe it is the worst on the short tracks
as the other "XTX's" that I ride with do not seem to have this problem to the severity we do. OFT offers a really sexy plate but I did not want to wait as shipping from them
seems to take for ever. I'm guessing their location has something to do with this!

Scott

 

[poor farmer/logger]

I get a little bit of ice at the back of the tunnell and some up at the front drivers. Usually my sides stay reasonably clear. Once it freezes up good a little hit to the side of the tunnell breaks it loose. Just back up a bit to clear it and off you go again. If I'm on a groomed trail all day them i get a bit more ice at the back. Usually don't ride on groomed trail though.

I've got the tunnel protectors removed and run a 1.75" backcountry

 

[Mills]

Grizz, I use McMaster Carr for work all the time so the next time I call down there I will be getting a 0.050" aluminum plate so that I can make the block off plate you showed in your picture which is set up from the tunnel protectors. Does the plate alone do the job or do I also need to install a rear exchanger to get rid of the ice completely?
I will also be ordering a gusset kit from you this spring. We got snow early and a lot of it alnog with consisten cold temps so our trails have never been better which is why I didn't rip into my sled and do the gusset kit when I called you. I am gonig to wait to do all the mods after the thaw.

 

[grizztracks]

You don't need the exchanger. I added the MTX exchanger because I had a problem with engine consistently running hot. If you are interested in a tunnel exchanger Mountaintech makes a nice one at a reasonable price.

http://www.mountaintechindustries.com/

 

[canoehead]

This is a picture of mine. Similar to Grizz's block off but I have the sides bent at a 45 degree. Amazing how little ice I get now.
http://www.ty4stroke.com/download.php?id=77753