What might cause the CVT belt to heat up a lot?

I'm see temps of over 250F via the Razorback CVT temp sensor, which is very bad.

Dealer installed a Warrior snorkel kit on my 2020 Cforce 600 touring years ago but I also have a Razorback CVT fan and I can feel a lot of air coming out the CVT exhaust port.

Thanks, John

What might cause the CVT belt to heat up a lot?

I'm see temps of over 250F via the Razorback CVT temp sensor, which is very bad.

Dealer installed a Warrior snorkel kit on my 2020 Cforce 600 touring years ago but I also have a Razorback CVT fan and I can feel a lot of air coming out the CVT exhaust port.

Might it be the transmission overheating somehow?

Thanks, John

[2015 Z Force 800 53/Trail EPS]

There are a number of things that causes the belts to heat...or heat higher then normal. Normal being something at or under 200F let's say. Lower air flow is one, higher continuous higher speeds like running down roads at or above 45mph, higher spring resistance as in clocked to a higher setting or stouter springs in the primary, warn or binding helix in secondary, on some a mis-alignment between the two clutches, a glazed belt slipping all the time. But no transmission issue other then something that would cause increased load on the clutches would have an effect on cooling. The biggest cause on mine even with the increased clocking and other things is air flow. I run an air filter on mine and as it gets more restrictive the flow rate drops and up goes the temps. When it starts bumping upper 190s-200 I flip the helper fan on which takes it back down to the upper 170s. When that stops helping I have no choice but to pull and clean the filter. PITA but at least my clutches stopped wearing out parts from all abrasives being pumped through it. I suggest a full inspection for yours. Check the sheave condition for slippage...which is the #2 cause for unwarranted heating.     

How would one know if the helix was binding & what does a worn one look like?
What should the sheave look like?
I have taken apart the primary when a belt blew up and melted, and I think I clocked it to the default Letter, do you know how what the  clocking should be as I will check that?
By clutch misalignment you mean primary to secondary front of the bike to back of the bike?  Ive never checked that, but will.
Thanks John

[2015 Z Force 800 53/Trail EPS]

How would one know if the helix was binding & what does a worn one look like?
What should the sheave look like?
I have taken apart the primary when a belt blew up and melted, and I think I clocked it to the default Letter, do you know how what the  clocking should be as I will check that?
By clutch misalignment you mean primary to secondary front of the bike to back of the bike?  Ive never checked that, but will.
Thanks John

Well on the helix, if t tends to stop shifting out and tends to run the RPMs higher then it should or, the helix ramp pads are scared and warn, replace them. Stock most all CFMs come clocked to B1. In most normal applications B2 is the highest you ever want and on a 600 that may be too high. C1 is a good spot for any 5 or 600 machine. And if yours is newer then 2017 it likely has alignment shims so that the front and rear fixed parts of the sheaves are in align. As for sheave condition lay a straight edge all the way down and if you see anything like this..even a little bit, it's shot and needs replaced as well as the belt.

I haven't checked the primary/secondary alignment yet but I'm looking through the service manual and don't see any shims for the shelves, am I missing something?
As a reminder, my bike is a 2021 Cforce 600 Touring

[2015 Z Force 800 53/Trail EPS]

I haven't checked the primary/secondary alignment yet but I'm looking through the service manual and don't see any shims for the shelves, am I missing something?
As a reminder, my bike is a 2021 Cforce 600 Touring

Although not where I thought it would have been, the parts breakdown does show one on the secondary.

The inner sheaths on the primary & secondary should line up with each other, correct?
I just noticed that mine are about 1cm offset, that's not right is it?
And if not, what the heck might be happening?

[2015 Z Force 800 53/Trail EPS]

I think you need the manual to tell you how to align them but there is only the one washer/shim so..likely not the issue. The fan impellers/fins are on the back side of the primary. Pull it and inspect them, the intake tube and the exhaust for anything that can slow the air flow. Sure is a lot of dust and other stuff on that primary..probably from the belt overheating but you said it lost a belt previously...when it was replaced, was both clutches completely removed for cleaning and inspection? If not...do it now. Look for missing fins. Also the idler bearing..check it for smooth operation. 

I somehow got some dirt into the CVT as it was clean before the ride - I have to check all the air hose connections, I'm thinking one came loose or I have a hole somewhere.

How do you remove the primary to check the back (impeller) side?
I have the service manual but it's a bit lacking sometimes

The "idler bearing" is the one that the belt sits on when idling, correct?  It does need replacement as one of the bearings is a little crunchy.

[2015 Z Force 800 53/Trail EPS]

I somehow got some dirt into the CVT as it was clean before the ride - I have to check all the air hose connections, I'm thinking one came loose or I have a hole somewhere.

How do you remove the primary to check the back (impeller) side?
I have the service manual but it's a bit lacking sometimes

The "idler bearing" is the one that the belt sits on when idling, correct?  It does need replacement as one of the bearings is a little crunchy.

By asking how to remove it tells me that they have not been removed for cleaning and servicing. The service manual is pretty clear on how to remove them but you will need the puller. And because it has the warrior snorkels, they are likely the 2" where anything under 2.5" will be restrictive. Found that out on my Z where it had to have 3" on the CVT intake to avoid restriction. Make sire there are no kinks or anything that can slow it down. Your blower should overcome the flow loss.

you are correct, I have not pulled the primary's inner sheave, everything else.  I'll looking closer at the CVT section of the service manual.

thanks
  John

[2015 Z Force 800 53/Trail EPS]

The puller is necessary?

Oh yes. You won't get it without it. But you can get them off ebay for pretty cheap.