STM vs CVTECH Primary Clutch Shootout! Which Clutch Do You Buy? Shocking Results! - Dragy Based Data

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This week on Let Dirt Fly, we film our most controversial video to date! We put a STM Rage 3P against a CVTECH Trailbloc! We use a Dragy to record out 0-20, 0-30, and 0-40 MPH times as well as record 0-100, 0-200, and 0-300ft times! Which primary clutch do you buy? The results are going to shock you!
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[@marcosrodriguez4332]

Awesome video. The testing and results were cool. Keep it up.

[@JetSnake128]

2 guys giving their opinion, great vid. I have a CVtech and PV3 on order for my 850 XT from High Tech Performance, can’t wait to test it out.

[@justingates1122]

good job felas ,hope your having a good year..

[@dennisporteous3613]

Great job Marshall and Seth. Very good video.

[@LetDirtFly]

Thanks!

[@bobbyelkins6678]

Keep up the good videos guys I like listening to you and watching you guys. My CF Moto has a CV tech and I like it.

[@mattgardner7869]

Great video guys, I've been waiting for this for some time . I ride a 650XMR and have a cvtech primary. Stock secondary. I have been through 3 springs and 2 sets of weights using the knowledge of the experts with quite a few struggles. I would love to hear your spring and weight set up and if you see value in the secondary spring update. I found my set up tough to ride in tight trails as the power hits pretty hard wanting to lift the front end. I'd love to hear you comment or do a video on your findings or thoughts. Thanks for always sharing real time informative information.

[@dbear763]

Thanks for the info, I’m ordering the cv tech for my new 650 xmr in the morning.

[@LetDirtFly]

Awesome man, you’ll love it! Like we mentioned in the video, they come setup closer but need fine tuning when you get it. Don’t be surprised if it doesn’t feel too good at first. Some places can’t even get them in the ball park. Mine was off by 1000 rpm. Which is huge!

[@wheelstandr]

This video is gold Jerry! Gold! I have a can am 570. So glad to know the CVTECH is the one for me, that kits suck and the STM would have killed power. Most of all at a lower cost. I am frustrated that they bumped the price $127. They used to be $400 BUCKS! I have a transmission blanket from my drag car that's out of date. Too bad theres not a way to use it if I blow it up. Anyways, Kudos to you on an excellent video. Great job.

[@kevinharrison6382]

Great vid fellas! I just bought a full Stm combo for my xmr 850. I ran the cvtech though for the last year and it spun my 32” nators with ease! The cvtech is a great primary clutch for the money!

[@justinhicks422]

What was your setup as far as weight and springs for your cv tech? I'm about to get one for my 850 xmr on 32 nators

[@LetDirtFly]

Yours will be different due to the weight of them. The Teraches are very light.

[@tonylopez7823]

2021 Outlander 650. Saw your earlier video and went with the Dalton 650 with the HD secondary spring. Happy with the results but damn now I want a cv tech. I should have listened to everyone’s advice. Meanwhile, it’s still better than stock.

[@LetDirtFly]

Yah, when I made that video I didn’t know too much about clutching. I’ve learned a ton over the last 2 years and if you have the money, it’s better to jump right into the cvtech.

[@TrzCharlie]

Interesting results. I just ordered a CVtech for my Can Am Maverick Max 1000r. I am hoping for a non-explosive clutch....

[@LetDirtFly]

We all hope for that model 😄

[@jreca]

Great video. I have a 2021 XMR 1000, which upgrade would you consider more important if you could only do one - a tune or a new clutch?

[@LetDirtFly]

Clutch. the tune can come later. Seth's 650 hasn't been tuned yet, But with the cvtech its doing great.

[@Luke_Cullen]

To make the absolute most power to the wheels on a Renegade 1k what clutch setup would you recommend? (Heavy mud riding)

[@natetaylor7687]

What would be a good combo on a defender max on 32s to 35s

[@BouletMichael-sb3nl]

The factory set up from CV tech give you the same performance.trailbloc give you peace of mind , more time in trail less at maintenance and save you a belt sometimes

[@TurmiteRS]

Cv tech is a good budget buy. i run a cvtech stm secondary combo on my 1k outlander

[@chrismilleR1023]

Have a 22 650xmr. I’ll be going with cv tech

[@LetDirtFly]

Awesome!

[@TraveladvRajanSRai]

I got a 05 Brute f 750 orig belt 5k mile

[@AmotorB]

Such an amazing video! I know its possible to tune the CVtech to match a STM if your on 32in or less tires. To be honest. The CVtech has done me well over the years. My 570, 650, and 850 all had one on it. I've never broken one yet. The 570 did have a STM primary on it for its last ride and though it did great. Come to find out the CVtech I took off it wasn't tuned right. So yeah who knows what I could have been capable of. As for QSE. They're just like STM but way harder to tune from what I've seen. I think by the end of the day I never plan on going over 32in tires so the CVtech will always be my go to.

[@LetDirtFly]

They’re definitely a great clutch for the money! That’s why I’m keeping mine for the 650. Does great with the 32s surprisingly!

[@annexoffroad]

Thanks for that tidbit about qsc being harder to nail on tuning. Im not going bigger than 32s and might go 30s however gonna ride out on the stock cryptids till they are toast...still getting cvtech right away though. I think a cvtech w/yosh pipe and rvs tune should work fine.

[@loiscaspary9986]

I got the stm for my 850 and I don't regret its a much better built clutch and was well worth the money

[@terryroy3943]

I've been running a cv tech and stm secondary since 2012 on my 800 max with 29 5 ol2 no issues and just swapped it onto my 19 xmr 850. Back when we bought the cv tech originally it was to gain a lower engagement or gear ratio. Is that not still the case or has can am since changed the primary from my 2012?

[@LetDirtFly]

Yes that’s also the case that we didn’t mention in this video. I did mention it in the cvtech vs clutch kit video. The one way bearing is smaller which helps get the belt lower in the sheaves which equals more torque off the line.

[@cb_jay9226]

How much did you torque the cvtech to ?

[@alexmclachlan1896]

That's a really interesting issue you had with the stm on your 650. I have a 650 max xt and I'm definitely thinking of getting the cvtech now after hearing what you went through (30" CST Sludge Hammers are as big as I'm gonna go). I'm wondering if there are people that had similar problems with their machines?

[@LetDirtFly]

There’s a ton of people that can’t get the stm to work on a 650. The problem is the fly weights are too heavy. We removed all of the weight out of the clutch and could only get 7400rpm out of the 650. For a 650 you want 8200. I figured, no big deal just do a primary and secondary spring swap. When I called 3P and STM they said my motor was “hurt” and that’s why I can’t get to the rpm. But yet my cvtech ran 8200 all day long

[@jeffreyhagelin3672]

@@LetDirtFly Did you try a stiffer primary spring with those lighter weights ? And remember, there are two shift points on the primary spring, between start and finish, combined with fly weight ramp profiles, which all affect acceleration shift out RPM and performance. We race snowmobiles and clutching up north and have found thousands of parameters of opportunities to work with.. That difference in overall weight between those two clutches is essentially non-existent..given these tuning options.

[@curtismoar6937]

Qsc is brutal only one primary spring to choose from. Sold mine

[@LetDirtFly]

We’ve never had a chance to try one yet. We’d love to one day. That kinda sucks if you only have one spring to choose from though. That leaves a lot of tuning left on the table.

[@concealit4800]

cv tech truly know there stuff

[@carterg2982]

Hey guys. Was wondering if you could help me a little. I've been getting a bit of a run around with some shops and have wasted money on some useless parts. Anyways, I have 2018 can am outlander xmr 850. It has 6 inch lift with 34 inch assassinators on in and a hmf exhaust. Love this bike but I go through belts pretty quickly. Should I get a primary clutch or maybe a primary and secondary. Any advice would be greatly appreciated. Thanks.

[@LetDirtFly]

If you’re on 34s with no clutching and no gear reduction like portals then you 100% need clutch’s. You’re creating too much heat. I’d probably go STM or QSC. The CVtech would work great, the bigger the tires, the more heat you’re going to create. The bullet can handle it much better over the cast aluminum.

[@jreca]

Do you happen to know the peak power for a stock XMR 1000 with Yoshi pipe?

[@LetDirtFly]

I believe it's about the same as the 850. 7200 rpm

[@user-ny7xv4uj1v]

Hi, how tight should I screw the bolt? I bought CVtech, I have an Outlander 1000r Max XTP 1000r 2022, do I need to add any washers? Please help

[@LetDirtFly]

Not positive but i feel like it should be around 89. look for the specs online.

[@bub99554]

I love my cvtec for competition purposes you take the black ring off you get more aggressive take off

[@eduardodeleon1497]

So i live in southeasttexas which one should i do 1000 with 30 inch tires gets pretty hot down here

[@LetDirtFly]

You’d be fine with the CVtech. Mark Sommer who is the CVtech guru runs over 100 wheel horse power through one with no issues.

[@charles1127x]

Awesome video. Super helpful! I'm looking to run the same setup. Which weights are you using with the 1017 spring? Have you been hitting rev limiter from wheel spin when hammering it while on the trails? I saw you were getting a peak RPM of around 7700rpm while in high, which is getting close to the 8000rpm cut off. So if in low on the trail and you hammer it, you must hit rev limiter? Thanks!

[@LetDirtFly]

With the 30's i didn't hit rev limiter but with 32's i am. I will have to shave a little weight off. I don't remember what weights in there right now.

[@charles1127x]

@@LetDirtFly if you're over revving then you need to add weight. Your 32's are lighter than your 30's. Or they have less grip off the line. Curious to know once you check your weights. Thanks

[@sethharman3006]

@@charles1127x I believe we went to 18 gram weights with the 1017 spring for the 32's

[@kg-is4en]

I just got a cvtech for my 22 850 xtp from hightech powersports tuned from 3p clutching. They sent a grey secondary spring too. I run stock 26 in. Tires. I have a dynojet with an RVS performance tune. Should I try the stock secondary spring or run the Grey?

[@LetDirtFly]

Try them both and see what your shift out is.

[@Bow-Fiend]

Did you test both springs?

[@kristiancameron3469]

So for heavy 32 assassinators on a Canam 850 XMR,.would you recommend a CVTech or an STM Rage 3 ? I could possibly go to 34 assassinators later on too...

[@LetDirtFly]

if there is a possibility of 34 just go with the stm/qsc primary. Why buy it twice. the cv tech will turn the 32's

[@KwikRacing800]

I was one off those people that helped them with the tuning of the cvtech. i am 16 years with can am racing, building high hp engines and spending hours on hours on a dyno in the last 10 years testing performance products to see what your getting for your money. The cvtech is a proven winner with many. It works well up to a 32 inch tire on the quads. Now there are pros and cons to every clutch so there are applications where the billets are going to be better then the cvtech will. The thing is too many drink the coolaid and THINK ( without testing and comparing) that a billet clutch is better for performance.

[@minnesotaxmr]

I do my research and make my choices. Most people don't have the time or $ for test tune ride, test tune ride etc. I got the QSC and STM combo set up for me and could not be happier. BUT that's just my opinion. Your kool aid comment (even with your resume'), was appreciated by few I'm sure.

[@kristiancameron3469]

So on a Canam 850 Outlander 850 with 32 assassinators, would you recommend a CVTech/STM secondary or STM Rage 3 with STM secondary?

[@VicToR_Rider]

Hey what do u torque ur secondary clutch to? I have the white spring. Can't find anything online

[@LetDirtFly]

Factory spec, 44ft lbs. I add a little bit of medium lock tite just to be safe. We’ve had the bolt pop out before

[@VicToR_Rider]

@LetDirtFly ok yea thats what we went with. Thanks!

[@aaronlangdon9064]

Can you guys help me out, I’ve got a 650 xmr with a trailbloc and the engagement is at 2700rpms, I’d like it to be around 2200 and I want to get 8100 rpm’s out of it what weights and spring will I need to achieve that?

[@LetDirtFly]

Hey man, if you have Instagram message us on there. If not, I’d start with a 1012 spring. That should put your engagement around 2200 or so. Weights are up to you because that will determine how high your rpm is. You can drill and grind them to get your rpm up. You need to get a gram scale for this and start small with drilling to slowly take a gram out at a time. If you’re on a stock secondary, I’d go with a white EPI spring to help get the rpm up as well.

[@ronaldmarshall4054]

I just ordered a cv tech for my outlander 1000 xt

[@mataralmuhairi2402]

Did you like it and what's your shiftout

[@ronaldmarshall4054]

@@mataralmuhairi2402 yes i like it no problems at all my son has one also on his xmr 650 with 33's

[@spencertyson9545]

Thanks to everyone comments and I appreciate everyone response . I have a 2022 XMR 1000 outlander with 34 assassinators for more power and turn RPM . My option is STM primary and just stock secondary with the white spring. Open to try and give you my out come

[@outdoortexan114]

If got a 2022 850 outlander, wanting to run 32 in sassys. Will cvtech turn them good with them being one of the heaviest 32s? I don’t like the the price of the stm lol

[@LetDirtFly]

It should handle them fine no problem. Just stick with a factory wheel or a light aftermarket wheel to help save some weight. Nick from 2up2down runs 32 sassys on his 650 with only a cvtech and epi white secondary spring

[@outdoortexan114]

@@LetDirtFly what would be the best spring for my secondary?

[@LetDirtFly]

@@outdoortexan114 probably epi white spring. If not its a good starting point.

[@chadcamacho8092]

I’m surprised nobody has said anything about the factory clutch but then can be tuned to run with CVTech.

[@LetDirtFly]

The can am factory secondary clutches are a pretty good design. It’s just the primary that’s not great. Going to a stm secondary definitely helps and also is way more adjustable.

[@TraveladvRajanSRai]

Is stm more durable

[@TurmiteRS]

Now do the testing on a 1k outlander and renegade now!

[@LetDirtFly]

We don't have them to test on

[@stephenkaminski1730]

Do you have draggy numbers with the stock clutch? Wondering how much time was taken off? I trail ride and drag race friends on big horns, thinking about getting a CVTech

[@LetDirtFly]

Sorry we didn't have a run with factory.

[@stephenkaminski1730]

So in a drag race, would a clutched quad put a few lengths on stock clutched quad?

[@LetDirtFly]

@@stephenkaminski1730 yes it would.

[@ParadiseLifeStyles]

Qsc primary stm secondary the way

[@DriveWayMafia]

Getting away from the cvtech lol ordered stm primary and secondary for my commander

[@superbee6270]

Do you guys sale CvTech clutch tune areday ?

[@LetDirtFly]

We don't sell them. Just help tune them.

[@lukidd]

How does it compare to stock clutch though?

[@LetDirtFly]

It’s night and day from stock. Any aftermarket clutch is a massive gain over stock. Maybe in the spring we can film a video for you guys. The biggest thing with a aftermarket clutch is being able to tune the quad into its peak power. Stock, the quads under perform massively.

[@stoneycarter5546]

i have a new 2021 outlander 850xt stock it seems slow or weak off the line until mid range what clutch would you guys get i want it to hit off the line but still drive and ride normal ?

[@LetDirtFly]

If you're running 32 or less tires and doing trail riding a cv tech would be a great clutch for you.

[@stoneycarter7789]

I'm all stock and wheels and tires

[@LetDirtFly]

@@stoneycarter7789 cvtech for the win

[@mataralmuhairi2402]

Get yourself cvtech primary the stock shiftout build for mid range power and it sks it feels dead when you hit it dead stop I have 22 1k outlander and I changed to cvtech huge difference and your aim should be 7300 to 7400 shiftout

[@DigitalDesigns1]

wish you have run stock first then these 2 to see the difference....

[@LetDirtFly]

We did if you look back at our previous videos. We did it with a 650 XMR.

[@jayhauk9537]

Have you bored ur 650 yet. I have cvtech in my 650 didn't notice any change over stock .. I'm thinking I need put 800 kit in ..

[@LetDirtFly]

Is the clutch properly tuned? You need a flash tune to raise your rev limiter to over 9k RPM and your shift out should be at or around 8300 RPM with a 650. The 650s make peak power at 8000RPM. If your clutch isn't properly tuned you won't feel any performance gain.

[@jayhauk9537]

When I ordered the clutch they said they can tune to my set up.. where do I get a flash tune

[@LetDirtFly]

Yah there’s your problem. All the clutch companies say they’re going to tune for your setup, but 95% of the time there’s still tons of room for improvement on the table. When your in high, go wide open and see where the RPM is at under a pull. We have Mr.RPM flash tunes. There’s other companies as well. Stay away from wholesale ATV/atvflashing.com. He does cheap tunes and doesn’t do half of what he says he is going to do to it.

[@jayhauk9537]

My top is fine I'm looking for more bottom end say like if my bike has gears it's like taking off in 3rd .. need more acceleration... good to know .. . I was just looking at wholesale ATV

[@LetDirtFly]

You’ll be able to gain a ton of bottom end with clutch tuning. Depends on what you want out of the quad. You can make it so the front tires never touch the ground when you hit the gas lol, but you’d lose top end. Do you know what spring they have in the clutch? Also what size tires are you running.

[@melquisderrico5001]

Put one 🤫👉1cent penny before EACH WEIGHT on cvtech clutch,,,FIT perfect,,,,6 cents deal or double 12cents work too,,,,,😱😱oem each weight is _16grams + 2.30of 1penni = 18.30grams set,,,,,,or 2pennis total of 20.1 grams 💪💪💪💪is the best for big boy🧐😎🤯

[@minnesotaxmr]

QSC primary and STM secondary is a proven combo. Or both STM's. Trust Me, I did a lot of research before making a decision. You'll get the CVTECH and change to QSC anyways. Save your $. I ride with 4 others that tried CVTECH and ended up getting the QSC /STM comb and could not be happier. I went right to that combo. As Always "Ride Hard and Be Safe" MN Bill

[@LetDirtFly]

Guess you'll have to wait and watch the video. We worked with clutch experts and mud racers to set up both clutches. you'll be surprised by the results...

[@minnesotaxmr]

@@LetDirtFly Wow!! was I surprised. I thought the STM would be hands down better. That was a great test you put together. I wish you could have put the QSC in the mix. If you get one, please do another video. You didn't mention the weights of the STM or CVTECH compared to stock. The QSC is 3 lbs. lighter than stock. That' a real plus. Keep makin' the videos, I enjoy them all. MN Bill

[@LetDirtFly]

@@minnesotaxmr we would love to get our hands on a QSC and do the test with all 3 clutches. The STM does feel a little better all around then the CVTECH, but the Cvtech is no slouch if tuned properly. Have a good one man! 🤘🏼

[@CBoutdoors-vh1ez]

I'm in Canada I have a 2022 renegade xmr 1000 I want this setup that your talking about for mine what is the best website to get these ????

[@minnesotaxmr]

@@CBoutdoors-vh1ez QSC and STM web sites. A lot of dealers have them but the prices are close to the same. Shipping and handle might make a difference. Ride hard - MN Bill

[@legowolf22]

So if the CVtech has been known to have issues in extream heat, has anyone heard of them having issues in extream cold?

[@LetDirtFly]

Haven't heard of any issues with the cold. Heat yes like you said.

[@legowolf22]

@@LetDirtFly Off tkpic but I noticed, here in Canada at least, the price of the Aztex have shot way up. Cheaper to get the Motohavocs by almost $400

[@LetDirtFly]

@@legowolf22 Every time they sell out the price goes up. I guess with inflation the materials are more expensive.

[@legowolf22]

@@LetDirtFly Not to mention all the free ads they got from guys like you and mud puppy. They know they have the lightest large diameter mud tire but its ugly so they needed the word out and now they can charge accordingly. With such a price gap now between the 2, im now leaning to the motohavocs.

[@LetDirtFly]

@@legowolf22 It might not be as pretty as other tires, but they work and that's the only thing i care about. lol

[@TraveladvRajanSRai]

Hb a chain like subaru

[@billy7805]

Are those the aztec tires if so how do they perform

[@LetDirtFly]

They are. Awesome in mud, great on the trail. Might be the best all around tire. They do run a little small.