Nice looking clutches ...Try marking with a black marker ,the inside of the primary and secondary sheaves and drive at top speed / Shift out
This will allow you to see were the belt is riding and if it is bottoming in the secondary or other
I have no experience with the STM setup but in your picture it looks like your belt is riding extremely high in the secondary...but this may be OK with the STM? ...Have you called STM and ask them about this ?

 

Nice looking clutches ...Try marking with a black marker ,the inside of the primary and secondary sheaves and drive at top speed / Shift out
This will allow you to see were the belt is riding and if it is bottoming in the secondary or other
I have no experience with the STM setup but in your picture it looks like your belt is riding extremely high in the secondary...but this may be OK with the STM? ...Have you called STM and ask them about this ?

No I haven’t talk to them yet this just occurred last night I have plans to call them on Monday. I was actually wondering the same thing because it looks awfully high on the secondary what would cause that do you know

 

I actually was just sitting here thinking maybe the primary spring is too weak and needs to be stiffened up

 

But I’ll definitely try that Marker thing I saw the video that Hunter works did. And thank you for the advice. I definitely could use more. This clutch has been a pain in my ass for the past two months. Adjustment after adjustment weights alignment tools all the stuff later

 

It could be a number of things ....If it was a Polaris clutch I might be able to help , but I have no idea what STM does
Do you think your belt is slipping at certain loads? Do a few Hero laps with the cover off get it good and hot , and then shut it down and feel the Primary and secondary. If one is way hotter than the other this will help you diagnose were the slip is coming from

We might be able to get some more answers ...watch this .... @RWB713

 

It could be a number of things ....If it was a Polaris clutch I might be able to help , but I have no idea what STM does
Do you think your belt is slipping at certain loads? Do a few Hero laps with the cover off get it good and hot , and then shut it down and feel the Primary and secondary. If one is way hotter than the other this will help you diagnose were the slip is coming from

We might be able to get some more answers ...watch this .... @RWB713

Lol...sorry to leave you hanging Max, I was out doing other things all weekend.

@Tryfon masouris I'm not at all familiar with how the STM's clutches adjust or operate, so I'm not going to be much help, but contacting STM is going to be your best best, I would guess that whatever is causing your secondary to close up so much that it basically pushes the whole belt out of it at rest is your problem, it's probably got the primary to secondary relation all out of sync and you're slipping and over tensioning the belt, then on decel the belt is so high in the secondary related to the primary that it's getting loose and slapping the cover because the primary is opening more than the secondary is closing.

 

To answer your first question ...if the belt is riding to high in the secondary then your secondary is closing to far. Check for whatever is supposed to be limiting this movement

 

It could be a number of things ....If it was a Polaris clutch I might be able to help , but I have no idea what STM does
Do you think your belt is slipping at certain loads? Do a few Hero laps with the cover off get it good and hot , and then shut it down and feel the Primary and secondary. If one is way hotter than the other this will help you diagnose were the slip is coming from

We might be able to get some more answers ...watch this .... @RWB713

It could be a number of things ....If it was a Polaris clutch I might be able to help , but I have no idea what STM does
Do you think your belt is slipping at certain loads? Do a few Hero laps with the cover off get it good and hot , and then shut it down and feel the Primary and secondary. If one is way hotter than the other this will help you diagnose were the slip is coming from

We might be able to get some more answers ...watch this .... @RWB713

It could be a number of things ....If it was a Polaris clutch I might be able to help , but I have no idea what STM does
Do you think your belt is slipping at certain loads? Do a few Hero laps with the cover off get it good and hot , and then shut it down and feel the Primary and secondary. If one is way hotter than the other this will help you diagnose were the slip is coming from

We might be able to get some more answers ...watch this .... @RWB713
[/QUOTE.

Out of curiosity, why did you upgrade to STM clutches with that low of mileage on your car? High HP build? Are you putting the belts on the correct direction? I put a factory belt on the wrong way and it blew in 80 miles (stock clutch, stock motor)... switched to Trinity “Worlds best belt” and they have been a dream. Took it a step further and got the one for the Pro XP (everything’s the same just slightly thicker), these belts are designed to handle 400+ Hp.

It could be a number of things ....If it was a Polaris clutch I might be able to help , but I have no idea what STM does
Do you think your belt is slipping at certain loads? Do a few Hero laps with the cover off get it good and hot , and then shut it down and feel the Primary and secondary. If one is way hotter than the other this will help you diagnose were the slip is coming from

We might be able to get some more answers ...watch this .... @RWB713
[/QUOTE

It could be a number of things ....If it was a Polaris clutch I might be able to help , but I have no idea what STM does
Do you think your belt is slipping at certain loads? Do a few Hero laps with the cover off get it good and hot , and then shut it down and feel the Primary and secondary. If one is way hotter than the other this will help you diagnose were the slip is coming from

We might be able to get some more answers ...watch this .... @RWB713

How do you download a video on here

 

My belt is fairly flush with the top of the secondary. Also, what needed welded? Its hard to weld aluminum and not have it warp. You might have thrown something out of alignment when whatever it was welded.

 

To answer your first question ...if the belt is riding to high in the secondary then your secondary is closing to far. Check for whatever is supposed to be limiting this movement

The back cover. This picture is under the primary a little to the right.

 

That belt looks like it is halfway out of the secondary in that picture. That surely isn't right. Something is outta whack.

 

 

Out of curiosity, why did you upgrade to STM clutches with that low of mileage on your car? High HP build? Are you putting the belts on the correct direction? I put a factory belt on the wrong way and it blew in 80 miles (stock clutch, stock motor)... switched to Trinity “Worlds best belt” and they have been a dream. Took it a step further and got the one for the Pro XP (everything’s the same just slightly thicker), these belts are designed to handle 400+ Hp.

 

Did you ever talk to STM? I have the same clutch setup but have not blown a belt in 1500 miles of using these clutches, but I do notice my belt does ride high on the secondary.

 

I haven't tuned on many stm setups but I can tell you this. Your belt is hanging way way to far out of your secondary. Not sure how you adjust travel in a stm secondary but I'm willing to put money on if u get that belt about flush with the top of your secondary your issues will go away. When the belt is shifted out that far the belt will slip like crazy and cause numerous other issues