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09 Nytro XTX Clutching

Discussion in 'Engine & Clutching' started by gc_srt, Jan 15, 2013.


  1. gc_srt

    gc_srt Pro

    Messages:
    145
    Location:
    Saskatchewan
    Hey,

    I purchased a clutch kit from Ulmer Racing and it is definately not what I was hoping for - it runs like an absolute dog. I have been playing around with it for several months and it still does not want to coorporate. It worked well on hard pack but never in the powder - just smoked the belt at start up and in the mid.

    Attempt 1 - Added weight to the heal and mid - both large weights on the heel, 6 washer on the mid, and 3 on tip. Works well on the hard pack but revs high in powder. Like 6300 at 15 mph in powder. Also slows down a lot from hard pack to powder and revs jump up a lot. Full throttle is good at 8500rpm.

    Attempt 2 - Changing out Helix from stock to Ulmers - I rotate it about 45 degrees clockwise and have it in the one six position. Same result.

    Attempt 3 - Went through both clutches and didn't see any problem. All ramps were touching the buttons and it did not bind when I shifted the secondary manually. Also, the primary weights swung without issue and the floating sheave and cover both moved freely. Is the issue with the primary spring being too strong? The spring is orange pink orange. In the powder I am slipping the belt in mid range and only hit 7800rpm for top end.

    Attempt 4 - Added more weight to the mid (8 washers in total) and droped a washer at tip. (trying to improve mid belt slippage and getting upper rpm up) - did not have time to drive it before I went to site.

    Since I am adding so much weights, I think the orange-pink-orange spring is too large. Should I try to go back to the strock silver-blue-silver spring and do all my weights again? This is getting frustrating.

    Below is a link to the spring colors:

    http://www.totallyamaha.com/snowmobiles ... onents.htm

    Thanks for the help!
     
  2.  
  3. yox185

    yox185 TY 4 Stroke Master

    Messages:
    1,010
    Location:
    Clark Mills, NY
    Call Allen and ask him, he'll probably have you fixed in no time.
     
  4. Irv

    Irv TY 4 Stroke God

    Messages:
    3,771
    Location:
    ONT. Canada
    Country:
    Canada
    Snowmobile:
    2008 40th Anniversary Vector.
    1995 XLT SP (Son's)
    X2, should have called him first before dragging his name through the mud.
     
  5. gc_srt

    gc_srt Pro

    Messages:
    145
    Location:
    Saskatchewan
    I am happy with Allen and his company. My intension was not to drag his name through the mud but to get a different opinion on my issue. Many people have a very similar setup so I was hoping that someone could help. I have had many emails and phone calls with Allen but he is a busy guys as many of you know (and so I am), so we end up playing phone and email tag.

    What are others using for a primary spring?
     
  6. yox185

    yox185 TY 4 Stroke Master

    Messages:
    1,010
    Location:
    Clark Mills, NY
    I am using the Ulmer kit as it came setup per his instructions and it is spot on. I have the same mods as you minus the k&n's and the 1.75 track. If you've been playing with it for a month it's time to give him a call. I'm all for testing and tuning but I would have given up and made the call by now.
     
  7. Irv

    Irv TY 4 Stroke God

    Messages:
    3,771
    Location:
    ONT. Canada
    Country:
    Canada
    Snowmobile:
    2008 40th Anniversary Vector.
    1995 XLT SP (Son's)
    Sorry, you never mentioned in your first post that you had contacted him so it sounded like a bash to me.

    Sorry to have assumed you didn't.
     
  8. radianguy

    radianguy TY 4 Stroke God

    Messages:
    1,894
    Location:
    Corner Brook Newfoundland, Canada
    Country:
    Canada
    Snowmobile:
    Yamaha FX NYTRO XTX
    Did you get this straightened out?
     
  9. gc_srt

    gc_srt Pro

    Messages:
    145
    Location:
    Saskatchewan
    To answer your first PM question, I smoke stock nytros. I added a lot of weight (last year) because the clutch was slipping due to lack of a skid plate and snow. The lack of skid plate caused damage to the primary clutch and it had to be replaced. Snow got in and bascially made the metal brittle (heated and cooled with snow).

    Before you start messing around with your setup, what is your shifting rpm? You should be looking for about 8700-8800rpm and pulling to about 9000rpm in the powder and 9200 on hardpack.

    My current setup is heel (1x T, mid empty, tip empty). This is with a ultamax belt (softer belt, lowering your shifting rpm) and a 19T gear.

    From what I have read, most guys run empty mid and tip with good results.
     
  10. radianguy

    radianguy TY 4 Stroke God

    Messages:
    1,894
    Location:
    Corner Brook Newfoundland, Canada
    Country:
    Canada
    Snowmobile:
    Yamaha FX NYTRO XTX
    Thanks,
    I'll try mid and tip empty see what happens.

    When you say you smoke stock nytro's are you talking short run or on the lake?
     
  11. gc_srt

    gc_srt Pro

    Messages:
    145
    Location:
    Saskatchewan
    Yes from a dig. With a long enough run, they begin to pull me in (less top speed).
     
  12. Mason Sorensen

    Mason Sorensen Newbie

    Messages:
    17
    Location:
    Lakeview Ia
    Country:
    USA
    Snowmobile:
    2009 Yamaha Nytro MTX
    Mountain Tech Front End
    Custom Wrap
    Ulmer clutch with Aluminum Helix and weights
    I may need some help as well I have an ulmer set up with special weights and pink pink pink on my primary spring, and my sled is pretty good over all but for an MTX, has a lot of top end, and was hoping to get more low end could any o you help me out I can show you pictures of how it is set up at the moment
     
  13. Mason Sorensen

    Mason Sorensen Newbie

    Messages:
    17
    Location:
    Lakeview Ia
    Country:
    USA
    Snowmobile:
    2009 Yamaha Nytro MTX
    Mountain Tech Front End
    Custom Wrap
    Ulmer clutch with Aluminum Helix and weights
    The weights are adjustable
     
  14. maim

    maim Moderator Staff Member Moderator Lifetime VIP Member VIP Member

    Messages:
    5,145
    Location:
    sudbury on
    Country:
    Canada
    Snowmobile:
    2016 apex xtx/ 2011 apex xtx/ 2009 phaser rtx/x/ 1997 et410t/r
    try going a gram heavyer in the heels or closest hole to the pin. you probably will have to lighten the tips up to get peak rpm back but this is a good starting point.
     
  15. baggs66

    baggs66 VIP Member VIP Member

    Messages:
    328
    Location:
    chautuaqua co. n.y.
    Country:
    USA
    Snowmobile:
    06 apex gt
    I like to run 14.5 rollers also if you don't already have them, they will give you better belt squeeze and faster upshift down low, so will lower your rpm about 200 rpm all the way thru. You will have to take 1 or 2 grams off of tip and as said above move to the heel of weight.
     
  16. Mason Sorensen

    Mason Sorensen Newbie

    Messages:
    17
    Location:
    Lakeview Ia
    Country:
    USA
    Snowmobile:
    2009 Yamaha Nytro MTX
    Mountain Tech Front End
    Custom Wrap
    Ulmer clutch with Aluminum Helix and weights
    Thank you very much I will try That
     

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