Well, this isn't good - primary is toast

[WinterWolf]

Great so I have a 2020 and now have to rethink tuning and clutch work? Great or spend 1400 on a better clutch to avoid all these headaches

You can get the stock stuff to work, but you better be checking it before every ride to see if it’s all looking ok(rollers, springs, weights, look for cracks etc).

Unfortunately like I said, they chinced on the clutching, and that’s where the weakness is now. If you keep it stock...less worry.

 

[ClutchMaster]

Couldn't agree more! I too almost went to a TAPP as well, but also decided to try what I had sitting on the shelf. Eventually I will also go back and try my PB80 this winter too. That PB80 worked so well on my turbo 1200 it was amazing, and it was quiet and even took down these boosted up winders. So I believe the PB80 will stand up well too.

I'm hoping we can make these things reliable and fast eventually. I've never had such a problem trying to clutch a snowmobile before. And for what these things are supposed to make for power, it should be easier than tougher!

Stubs was right......Just Tapp, Tapp, Tapp it in!

 

[STAIN]

If you keep it stock...less worry.

That's what I have been telling new owners. Keep it stock and dial the clutch's in .

 

[lakercr]

Put on a Viper or Apex Primary set it forget it will take all you can give it and not eat rollers. Keep an eye on the secondary also had one crack and come apart.

Thanks. Will the old primary pull the same setup, or will I be pulling some weight out? Seem to recall some discussion about this last year but haven’t gone back to search it yet.

 

[lakercr]

Great so I have a 2020 and now have to rethink tuning and clutch work? Great or spend 1400 on a better clutch to avoid all these headaches

As far as I know mine is the only example of this failure, so I wouldn’t be overly worried about this happening to yours. That said, this Primary was going to have a catastrophic failure in the not too distant future; it certainly wouldn’t have survived another belt blowing.

I think it has been established by now that these clutches need more attention than previous iterations. My post is mostly a heads-up on something else to monitor, especially if you’ve taken out a few belts.

 

[actionjack]

Way more of us have had no clutch problems. Just my opinion no more or less scientific than all the other claims. If you have no clutch problems dont go machining or wholesale changing.

I maybe wrong about this but what other sled had as many owners doing there own clutching changes. One of the main attractions of theses sleds is how much power you can add for relatively little money but with that comes the need to change clutching. As a percentage I would guess 998T have way more non-stock sleds than many other models AND at the far end of the spectrum in horsepower.

 

[STAIN]

Thanks. Will the old primary pull the same setup, or will I be pulling some weight out?

I think you will need to ADD weight. The Sidewinder clutch places the weight farther away from the center line necessitating the need for less weight to achieve the same clamping force as the Apex/RX-1 clutch.
I wonder what the weight difference between the two clutch assemblies is?

 

[lakercr]

I think you will need to ADD weight. The Sidewinder clutch places the weight farther away from the center line necessitating the need for less weight to achieve the same clamping force as the Apex/RX-1 clutch.
I wonder what the weight difference between the two clutch assemblies is?

I’ll weigh them both (empty) tomorrow and let you know.

 

[Byam]

I’ll weigh them both (empty) tomorrow and let you know.

https://ty4stroke.com/threads/nytro-primary-in-a-sidewinder.154036/page-2#post-1441425

 

[KnappAttack]

Thanks. Will the old primary pull the same setup, or will I be pulling some weight out? Seem to recall some discussion about this last year but haven’t gone back to search it yet.

If you use the say the 8JP belt expect to add about 3-4 maybe 5 grams according to some on here.

Another thing to think about Jim, is lots of guys are switching to the Ultimax XS825 belt and reporting 4-500 RPM loss switching to it. It too is supposed to last much longer than the 8DN and 8JP. I've bought a couple myself but have yet to use them yet either. Maybe using the Viper primary will wash out the RPM loss if using the 825. I'll find out if we ever get snow.

 

[ShootToThrill]

Close to 6000 miles running powertrail tune with an Apex primary. The primary has been bullet proof. Rollers are still in good shape. I do run the 911 cover though

 

[lakercr]

Way more of us have had no clutch problems. Just my opinion no more or less scientific than all the other claims. If you have no clutch problems dont go machining or wholesale changing.

I maybe wrong about this but what other sled had as many owners doing there own clutching changes. One of the main attractions of theses sleds is how much power you can add for relatively little money but with that comes the need to change clutching. As a percentage I would guess 998T have way more non-stock sleds than many other models AND at the far end of the spectrum in horsepower.

Keep in mind that Yamaha made some pretty wholesale changes to their clutch configuration after the first year of SW production. They then offered the kit at below cost to first year owners. I'm happy that the stock sled configuration seems to be working, but let's not pretend it was always this way.

 

[sideshowBob]

Jim,


One thing I always noticed when installing the SideWinder clutch on the shaft is it always seemed to "ping" when it was being torqued onto the shaft and took a bunch of travel to get it seated onto the shaft at 108 ft. lbs. I always thought the bolt was stretching or going to break prior to it hitting that 108 ft. lbs., but sooner or later it always seated and stopped.

I put on an old RX-1 clutch on my machine last week and noticed no "pinging" or excess travel of the bolt and it seated up right away to 108 ft. lbs. like it was nothing. In my mind I wondered if that was normal to seat up that fast and not act as though the bolt was going to strip or break.

I have also noticed how strangely unnerving torqueing the stock Sidewinder clutch feels...the first time I torque mine up I thought the bolt was going to twist off.

 

[Tarzan]

I use Nytro primary and secundery on my Sidewinder with 911. My Nytro dragracer was 390hp and with studs and i used the stock chlutches. and the cstock cluthces are still on it. So they work Sadly the winder stock clutces are no way near the quality like the Nytro/Viper and Apex . Yamaha is not the same like it used to be