Polaris RZR Forum - RZR Forums.net banner

Belt Slipping at High Speed

32K views 27 replies 14 participants last post by  Hunterworks  
#1 ·
I have a 2018 XPT with 200 miles on it. I put 32” tires on it. I run a lot of roads and levees at high speed around the 70mph range it feels like the belt starts to slip. Sometimes get burning smell if I ease off for a few minutes it goes away. Is that normal after changing to 32s? Do I need to upgrade the entire clutch or are the spring kits suffice? Thanks. Any input would be appreciated.
 
#3 ·
A Belt Temp Gauge could give you a better look at how your belt is actually responding to certain riding conditions/terrains/speeds, not to mention how useful it becomes when you start getting into the clutching or other mods. Might be a better tool than your nose when it comes to belt temperature monitoring...

For the only infrared gauges out there - Razorback Technology. Enter Promo Code FORUMSAVE25 at RazorbackUSA.com to save!
 
#6 ·
Contact Hunterworks for an adjustable clutch kit. Installed one and am very impressed with it being adjustable. And do it before the belt blows and causes you more grief, like trying to change one in the field or destroying the clutch cover. Changing the belt is a must. Also have you update the square punks to the rollers from Hunterworks. If not your secondary may be shot.
 
#11 ·
The reason your belt is slipping is because your current primary clutch spring is too weak and not allowing the clutch to adequately back shift as your rpm's drop under load ( think hill climbing, or long steep grades, this causes the belt to slip, rapidly overheat and fail. This is common when you add more load (32's, heavy paddle tires etc.) to the stock configuration. A well balanced (designed) clutch kit is essential to extending belt life. You will however be forced to give up the nice low rpm engagement that is designed into the stock setup if you really want to solve the belt overheating issue. This compromise is necessary until someone comes up with a dual rate primary clutch spring and then we can have the best of both worlds. My current primary clutch spring is a 275lb spring, engages around 2400 rpms and i can run it hard for hours and typically see temps around 190 degrees. Highest I've see is about 210 which is in a very safe zone. Temps of 240 and above will degrade the belt rapidly. There are good setups available and there are better setups, depends on what you want to accomplish. I choose lower belt temps over lower engagement for aggresive desert and mountain running and then I swap the primary spring out for a 235lb when i do Moab ( 2100 rpm engagement0. Its a pain but its the only way i know of to make the belts last with my style of driving.
 
#14 ·
I’ve been running aa clutch kit in dunes and just threw my 31” pickup tires on and when I let of gas it’s like I hit the brakes won’t coast at all and feels like driving in four wheel drive on the pavement I can’t hardly keep it straight! Anyone got ideas?


Sent from my iPhone using Tapatalk
 
#24 · (Edited)
Although I'm stock, I went with a Sparks clutch kit to alleviate belt issues. It changes a little more than the average clutch kit. The downside is it uses a different belt than factory. I also have a razorback gauge to install. Once I test it I can report the belt temps to see how much it is reading. Unfortunately I wish I got the gauge installed before getting the clutch kit to truly compare.

http://www.sparksracing.com/sparks-....com/sparks-racing-revolution-clutch-kit-polaris-2016-current-xp-xp4-turbo.html
 
#25 ·
Lol I’ve done all of what was mentioned above and it all helps. Bottom line is at continuous high speed the clutch needs more air in and more air out. That slipping feeling you feel is the belt cooking. Desertcraft make a fan that adds an extra tube in and the also have a kit the adds an extra exhaust port. At high speed this is what your going to need to keep the cover on.