Yamaha, there is a possibility of someone getting hurt with these SW primaries!

[fatchance]

I believs Dave at powderlites, the makers of the TAPP, is working on something. It would have to be better than the STM or Pro-4 secondary's. Those I don't believe are any better than stock.

You are correct Stain and it will have a variable helix too.

 

[Preacher]

Is this clutch on sidewinder with tune? Holding up?

No miles on it yet

 

[STAIN]

You are correct Stain and it will have a variable helix too.

OOOOOOOOoooooo. I cant wait to see this. Possibly like the variable helix for the RX-1? Shockwave I think they where called?

 

[KnappAttack]

OOOOOOOOoooooo. I cant wait to see this. Possibly like the variable helix for the RX-1? Shockwave I think they where called?

The Shockwave was a POS. I had one, yes it alters the angle but rollers would not ride on it properly. Never again. Can't beat a proper helix.

Myself, I wouldn't want or need an aftermarket secondary, but that TAPP primary is the real deal.

 

[74Nitro]

I think a large percentage of these clutch failures are cause by the crap bushings in stock rollers. If you look at more of the pics posted here or on FB where failures have occurred, the bushings are egg shaped. If the pin is in contact where the bushings is worn the weight will swing out passed the roller and go BOOM! At the very least, replace your stock rollers as soon as humanly possible with Thunder Products or STM rollers. Based on my experience, the stock rollers are good for about 800 miles with a tune before they are done. But, why risk it? Additionally, even if you had an older style Yamaha primary installed, if a weight flys out past the roller, it will be catastrophic. REPLACE YOUR ROLLERS!

I also think most of the primary explosions are caused by failed rollers allowing the weight to come right by. These are the same size rollers, 9mm ID and 15mm length, as Yamaha came out with in 1997 on 112 HP sled. It just not enough size to contain this kind of power. Now, if they made it a four arm, these rollers would probably do the job.

 

[kviper]

The Shockwave was a POS. I had one, yes it alters the angle but rollers would not ride on it properly. Never again. Can't beat a proper helix.

Myself, I wouldn't want or need an aftermarket secondary, but that TAPP primary is the real deal.

Mike have you had a chance to compare your Apex clutch setup to a Tapp? I bought a Tapp and it looks like I won't be able to ride this year due to having covid 19 followed by a stroke. Now I'll have to wait a whole year to play with it. A friend has an Apex clutch on his winder and he says there's good gains from the Apex clutch.

 

[KnappAttack]

Mike have you had a chance to compare your Apex clutch setup to a Tapp? I bought a Tapp and it looks like I won't be able to ride this year due to having covid 19 followed by a stroke. Now I'll have to wait a whole year to play with it. A friend has an Apex clutch on his winder and he says there's good gains from the Apex clutch.

Man sorry to hear about the stroke kviper. Hope your'e OK! I had my son inlaws Father have the same deal, COVID and then a Stroke, top it off with his two grandmothers deaths one with a stroke and he had a bad couple weeks about a month ago. This COVID thing is a BAD DEAL and sorry to hear you going thru it.

I have not yet had a TAPP on my machine. Honestly, there should be zero track HP gains if the clutches are tuned properly to begin with. I've been down most every clutch road there is and actually only found one clutch that was what I'd call "slow" and that was the HRP Quad Cam, It would always be 1 tenth slow in 600 no matter what I did with it, (I even changed the face angle on it to try and improve it), otherwise I can make any clutch do what I want it to do as long as it is good condition and not flexing or binding, they all should transmit power to the ground equally with the proper ramp profiles and springs.

 

[kviper]

Yes Mike getting covid is like stepping in a mine field,you don't know what you're going to get out of it. Since going through this I've heard all kinds of blood clot stories causing heartattack and stroke issues. One case I know of personally where the only symptom he had was lungs full of clots. I'm doing very well with not really any side effects any more but the doc says no lifting over 25lbs for a couple months and he said no bouncing around on the sled this year. Makes sense on the clutches, if you an efficient set up it is what it is. The Tapp sure looks to be a work of art!

 

[STAIN]

Myself, I wouldn't want or need an aftermarket secondary, but that TAPP primary is the real deal.

That is why I am curious to see what Dave comes up with. He did such a good job with the TAPP I am excited to see what is next.
The others secondary's----meh

 

[Thunder Products]

I think a large percentage of these clutch failures are cause by the crap bushings in stock rollers. If you look at more of the pics posted here or on FB where failures have occurred, the bushings are egg shaped. If the pin is in contact where the bushings is worn the weight will swing out passed the roller and go BOOM! At the very least, replace your stock rollers as soon as humanly possible with Thunder Products or STM rollers. Based on my experience, the stock rollers are good for about 800 miles with a tune before they are done. But, why risk it? Additionally, even if you had an older style Yamaha primary installed, if a weight flys out past the roller, it will be catastrophic. REPLACE YOUR ROLLERS!

I would agree to the large percentage of these clutch failures to rollers going bad right away....especially the stock Yamaha ones. The Yamaha rollers, the bushing gets pushed out and wedges the roller which makes it NOT rotate. Upon pressure, the roller then breaks the roller because the metal is thin. Yes, many pictures of this happening and with the roller gone, will not be good.

The video I posted on YouTube I think almost 3 years ago, was because I was approached by someone at the Novi snow show in Michigan. He told me I had to make my weights longer as they are going past the rollers. I told him that I am not changing our weights as I proved and tested that our weights are longer than the stock weights. See video

So, to be honest, @BlueByYou2000 is correct, if the roller blows out...there is nothing from stopping the weight from going past the roller pin. But I have put a weight in a SW clutch with just a roller casing, no bushing and even though I couldn't spin the clutch at 9,000 rpm, I could not get the weight to go past....even with prying on it. (And this was a SW clutch that was machined for overdrive which would make the movable sheave .060" further away from the roller in the spyder). So this is where the other percentage of these clutches are letting go is because of the cracking through the allen screw holes that hold the weight pin...which for years I have been posting pics of and now catching more of these through dye penetrant testing.

 

[Thunder Products]

This is a clutch with a new set of rollers...but the cracks through the allen screws tell the tale of what is happening. 1,000 miles on clutch, installed our rollers and within minutes (under 20 miles), the weight pocket blew out.

 

[slimjim2525]

Well, now you all have me worried. My backup sled is a 2008 Apex. Should I swap the primary clutch over to the sidewinder? Buy a new TAPP clutch? Don't want a break down out there, or worse metal in my body somewhere.

 

[STAIN]

Keep an eye on it an service regularly . Too much reading can lead to too much worrying.

 

[blevis213]

Thought the primary rollers were updated and the 20’s and 21’s were cured.

 

[KnappAttack]

Thought the primary rollers were updated and the 20’s and 21’s were cured.

No, nothing at all has changed on them, other than a tip weight change and helix and spring change on the secondary for calibration since the 2017 model year.