Lets all fix this Crappy clutching once and for all

[ruffryder]

One thing to consider is track size. I have heard that people going to the powderclaw from standard challengers see an increase in track speed. Is this due to less traction / more spinning or is this due to less weight / resistance of the track moving around? My thoughts is that it is spinning more, though in the powder, track speed matters the most it seems.

One thing I don't know about, is that four strokes tend to find more traction in all situations. I know in 4stroke dirt bikes when they first became popular, that one of the benefits of the increase of torque was the fact that the bikes had an increase of traction. Not sure on the why and how of that. Could the same be for sleds too?

I think that when comparing a sled with a maverick or powderclaw to a sled with a challenger extreme 2.5", that the 2.5" would have a lower track speed due to a large increase in traction.

Anyone have any comments to the above? Or am I far in left field?

 

[Rx1M5]

I think that when comparing a sled with a maverick or powderclaw to a sled with a challenger extreme 2.5", that the 2.5" would have a lower track speed due to a large increase in traction.

I would totally agree with that thought, but my thinking or hope is that the Nytro should be able spin my 156 2.5 CE. Like I was saying before my RX1 with the 162 16 2.25 Maverick normally aspirated had about the same power as the Nytro and it just didn't have these issues at all so I'm just not getting it.

Who knows for certain what effect putting in a steeper helix will have. I have a straight 43 and a straight 47 I can try, Will that force the belt lower in the secondary thus going higher in the primary? I know it will decrease back shift but maybe the Nytro has enough to pull at least the 43. Straight cut Shockwave guys what degrees are you running, turns out means nothing to me and what's happening in your primaries?

Really, next weekend if you think of it everyone put a marker line on your primary and check it out, I think you'll be surprised what you find out.


Rx1M5

 

[doo_man]

43 helix, stock mtx spring 80 degrees
stock spring secondary
Hauck 56 gram weights, approx 6 grams loaded (mid/end)
stock primary spring G-W-G
20/40 stock gearing
153" Challenger
220 lbs
1,800 ft
pulls 8,600
backshift is good
stock rollers, tried 15.5 but lost rpm even with less weight

 

[Rx1M5]

Doo Belt height and track speed deep snow pull?

Rx1M5

 

[spray25]

From your post I am assuming you are talking about off trail riding.

It is nice to see full shift out on the trail for sure, but not on the hill nor when messuring track speed. With a heavy load your clutches should be back shifting ie NOT hitting the top of the primary. If you are 3/4 from the top under heavy load your primary is shifted to far out.

 

[Nikolai]

Rode with the 19/40 gearing. Clutches were cooler to the touch but everything else stayed the same. Gained some RPM on top. RPMs were dropping to 8,500 or so under a load so I swapped in the pink/green/pink spring and that helped a little. With the lower gearing the hesitation/pop(from the rev limiter) was more noticeable. I wish I had a 41 helix to try too. Anyone want to donate one to testing?

Has anyone tried the 8FN weights? A loaded 8FS weight weighs 79.02 grams. The 8FN weighs 75.28 grams empty and looks like a better profile(bigger heel, smaller tip).


Edit: pulled the belt to clean the clutches and the primary had some belt slip down low which I'm assuming is from the lower preload of the PGP spring. Back in goes the GWG spring.

 

[infect]

http://www.hauckpowersportsinc.com/page ... heave.aspx

This is the only way to get full shiftout. My buddys 450+ hp dragrace rx1 turbo doesnt get full shiftout either.
He is a Yamaha dealer and he says thats the way the stock clutch works, wont shift out further than 3/4 from top.

 

[Nikolai]

That's BS, my buddies turbo nytro gets full shift out. I saw the clutch myself.

 

[Rx1M5]

My Rx1 turbo runs the belt up to about 3/16" from the top of the primary.

Rx1M5

 

[mtdream]

well, I think a Nytro issue is they are not all getting proper shift out...Some might be...

I just finally got mine to hit the RPM's it is supposed to...still not shifting out properly...

Here is my current set up...

Weights: 69.75 grams
Rollers: Stock
Primary Spring: Org-Pink-Org (90501-601L8-00 )
Secondary Spring: Arctic Cat Red/White (set at 70 Degrees)
Helix: Stock Apex Helix (47 Degrees)

Normally ride from 4-10K feet...only changes needed are a little bit of fuel changes...

10 lbs. of boost...and WOW!!!!!!!!!!

 

[Rx1M5]

It seems to me that your Nytro at 10 lbs should be more than capable of moving the belt up the primary, so chances are it isn't a power issue.

Rx1M5

 

[clutch]

Wouldn't a wider belt help, it makes sense. Just an idea.

 

[Rx1M5]

Wouldn't a wider belt help, it makes sense. Just an idea.

It would if you could shim the secondary enough to get the proper setting. I'm not sure it has that much adjustment, but really it should work as is cause it does on all the other sleds.

One thing I have been thinking about is the Nytro secondary is NOT interchangable with all the other sleds cause they changed the jackshaft on the Nytro compared to say the Apex/ Rx1. I wonder if there are some other changes in the secondary even though they look the same and use the same helixs?




Rx1M5

 

[infect]

Nikolai it probably was bs from my dealer. Checked mine today when i blew a belt. I removed the primary spring, closed the sheeves. placed a new belt in it and the measure i got from the top of belt to the outer edge of the sheave was just a few milimeters. but the belt dont travel that high when riding. Pardon my english im a stupid swede

 

[Nikolai]

So fast forward a little. I pulled the washers out of the secondary which got rid of the belt squeal and increased shift out a bunch. I also have the 14.5 rollers on order which I'll get to try next weekend.