Overly strong A arms.......

[Squish]

How hard are the hits that are damaging these sub-frames. Are they bending too easily?

Wouldn't it be better to have weaker A-arms that bend before the sub-frame?

 

[Stlhead]

I can't speak as to the other impacts, but mine was quite epic. 20-25 mph to 0 in about 4". Sled still rides well and is fully functional. Would have destroyed my sled last year. As to the fellow that is waiting for one good luck, there are none in the parts system right now, they are back ordered from Japan with no estimated delivery date......

 

[Linc]

Ken,,,ya ,it doesn't have one,,,,

 

[skidoomutt]

nytro owners beware

i just rode my nytro lastnight after putting my turbo on it riding on groomed trails for break in i got 46 miles on it and got off trail one time i was following a couple friends of mine and I ended up just bumping a rock with the right ski just barley scuffed the ski. didnt think much of it and kept riding it got home and noticed that the skis sit about 2 -3'' differant from each other. their is no visable sighns of anything being bent the biggest diffeance is between the two spindles one sits about 15 - 20 degrees differant pitch than the other one. if i bent my subframe on that little bump then i am very disappointed in the strength of this sled. I have never owned a yamaha before this one and i always heard how strong they are, in this case not so much. the left shock spring is touching the front of the a arm and the right one is touching the back of the a arm obviousley somthing is tweaked but I just cant belive a 4mph impact glancing off a rock would or should do that kind of damage

 

[bitchbang]

The Nytro A arms are tough alright. So tough that the subframe pretzels before they even bend.


Sounds like the nytro has a weak point,same thing happened to my b uddies,fortunately vernon motorproducts pulled 1 off a new sled and give it to him,it only took an hour to pull apart and 2 hours to reassemble,they told him up to 8 weeks out of JAPAN,somebody better get busy and make a knockoff,maybe chromoly,I'd rather change an A arm than a subframe!

 

[ruffryder]

I think this is a problem with going away from spindle type front suspension to one that connects with tie-rod ends.

When in impact occurs, most of the force seems to be put on the lower a-arm, which takes the all of the impact.

With spindles, since the spindle holds the two a-arms together, what force there is from the impact is spread more between the two and goes into the whole part of the chassis.

Just a thought, but noticed it on my rev and my nytro. The way to get rid of this issue is like the polaris sleds, where the lower a-arm is more triangular in shape and the force can be directed into the chassis with a smaller moment arm on the a-arm.

Also, the impact that is causing this is one that puts the force on the a-arm straight back. Hard riding and bottoming don't do this (snowcross), but having your ski/carbide hit something (especially while turning and going slow, dang rev) or hitting something with a lower a-arm (like the small tree that ended up being a cut off larger tree, dang nytro) will overload the frame and hence the tweaking of the frame.

Maybe this doesn't make any sense, but it sounds good to me. I could draw a free body diagram if needed.

 

[Ak nitro]

I started to bend mine the first day I rode mine stock, i don't know how but the top right a arm started to go backwards then a few week later i bent the other side the opposite way, I wasent going over 15 mph but I hit really hard because it taco'd the spindle. I have timbersled a arms now which should help because i have noticed they will flex. The stock a arms are so ridged that the impact goes straight to the frame. I called my dealer also, they have no idea when the frames will come in, I put in the order a few weeks ago.

 

[lemonf7]

First morning out in Island Park with my new Nytro my left ski found a rock that tweaked my subframe. A arms seem straight which confused me because I thought that they would have been designed to give before the subframe, anyway my left ski tip was moved about 3 inches back and the right about 1 inch foreward making the sled borderline unrideable. I had 5 days of riding ahead of me so that night I looped a tow strap around the end of the left lower a arm and the other end around a tree and used the reverse backing up repeatedly jerking the lower arm ahead until it was damn near perfect. I rode it for the next 5 days putting on over 400 hard miles and never had to rent. I ordered my new subframe this morning with no arrival date. If anyone can come up with a chromoly sub I want to be the first one on the list.

 

[Trader]

Well I feel good and bad about this whole situation. I also have a nytro with a left ski winning the race back to the trailer by about two inches over the right. First day, twenty kms, pretty choked. Didn't even really look at it as I thought it was the a arms so I wasn't to concerned. Looking at it now with no parts anywhere close to available I am really questioning some of the engineering going on at yamaha. To me make the a arms the weakest link and this wouldn not have been an issue, can't change that now though so I really think some one needs to step up and start fabbing a chromo piece up. I realize there is a lot involved but the canadian retail price is around $740 so I'm sure someone can make a bit of money on these.

 

[skidoomutt]

I was in at my local yamaha shop trying to address my tweaked front end and was telling them about all the postes on here with the same issues but when they called the yama rep he said they didnt know of any real problems with the front end, so i wanted to make sure everyone that has had a problem with this is calling there yamaha dealers or yamaha motor corp direct and logging complaints because if we dont report a problem then they wont fix it and I dont feel after droppin almost 10 grand i should have to rely on an aftermarket product to fix this problem. I think a recall warranty should fix it
here is the number 1-800-962-7926. we fixed mine by taking a three foot pry bar between the upper and lower a arms on both sides at the same time and pryer in opposite directions. I was fairley supprised at how easily it moved fixed for now but everyone that has had a problem or someone you know needs to call that number

 

[Ak nitro]

I found out my frame won't be in till mid february, kinda sucks cause my two weeks off is coming up. Guess I will have to take my timbersled arms off and put the stock arms on and bend it back with a pry bar or something. My dealer said they have another nytro with a tweaked frame waiting also, they called Yamaha but did not get anywhere, but that it will be awhile.

 

[pinnedunderdoo#3]

So much for yamaha being the most solid sled around
''caution'' Nitros got to watch out for pine needles and fallen leaves could take out sub frame. so much for you guys yapping about the xp and pine cones......

 

[summitking]

i wonder if you could drill out something on a a arm making it easier for the a arm to crumble and now the front frame

 

[Ak nitro]

So much for yamaha being the most solid sled around
''caution'' Nitros got to watch out for pine needles and fallen leaves could take out sub frame. so much for you guys yapping about the xp and pine cones......

You again you Yamalurker, this is actually pretty minor compared to what I have read on the other forums I won't go in to detail but something about engines, driveshafts, and belts.

 

[pinnedunderdoo#3]

wow at least that gets covered on warranty not your pretzel breaking at 4 mph.

 

[Ak nitro]

wow at least that gets covered on warranty not your pretzel breaking at 4 mph.

Wow, after all this time lurking around Yamaha websites you finally found something minor to tell your buddies, that must make you feel great. This is a first year sled, one issue surfaced, pretty minor campared to the laundry list of problems the other first year sleds have. It does not even matter really any way because when I am running 16 lbs of boost my skis don't touch the snow anyway.

 

[pinnedunderdoo#3]

your my hero 16lbs of boost but make sure when you load your tank on your truck that your carbide doesn't catch your ramp and bend your sub frame...

 

[Ak nitro]

Don't think the older revs don't bend frames either last month my buddy hit a rock tweaked the front sub frame, (I believe they call it the flying nun) that is a far more expensive repair than the nytro.

 

[whittaker727]

Who cares which one costs more, the point is trying to get Yamaha to stand behind their product. Keep calling that #

 

[pinnedunderdoo#3]

Don't think the older revs don't bend frames either last month my buddy hit a rock tweaked the front sub frame, (I believe they call it the flying nun) that is a far more expensive repair than the nytro.

Well my self i guess i have been lucky but my sled has hit a lot of stumps and im on the orginal a arms and skid. by the way if you have ever priced out a nun and random parts online its cheaper then a 1000 dollars to fix. so i dont no how you figure its more money.