This is not 100% but dang near it.
Low vehicle speed and low RPM almost always a lack of power for some reason and almost never clutch related.
Low vehicle speed and high rpm almost always clutch related.
The only time low speed and low engine speed is clutch related is when you are extremely off on clutching and the weights are just simply too heavy for the application. The way that works is, they move out too fast due to centrifugal weight advancing the belt too fast and keep moving it out until full shift out occurs too soon. Kinda like shifting a 5 speed car into overdrive too fast then you can’t overcome it.
Outside that pretty much it will always be a low power issue, could be something actually wrong with vehicle like low fuel pressure, low compression to something like way too big of tires on vehicle and causing a bad heavy load. All of these are low power issues. Stupid example, pulling a boat with your RZR is low power issue the same as low engine compression is. Both cause power to go down. You would be surprised what a dirty air filter will do too.
Low speed and high RPM are as mentioned really always 100% of time a clutch issue. If say normal top speed is 75 and it is now 73 could be the tuning somewhat but if like 65 and hitting the limiter, you certainly have a physical issue with your clutch like flat spotted rollers in primary or secondary, spider nut loose and spider backed off etc.
So small rpm issues, is clutch tuning, large ones are actually physical issues.
I put this up here to help people with either issue to get them started in the right direction and not waste time and money on the wrong thing.
Also, I cannot stress enough, when doing clutching it should be the last thing you do so you can get it dialed in right. Meaning, don’t do a kit then add 34" tires in same day same time in your shop. You will think it is your clutch causing you low power and it will really be your new heavy tires.
I also can’t stress enough, you should always right before you do a clutch kit do a top speed, top speed RPM and shift phase RPM test just as it is and the day you do your kit.
When you run into issues, the first thing I always ask is what did it do before?
If it won’t go faster than 65 now with kit and you didn’t do a speed run before and you never been over 50 before the way you ride, then it will be hard to convince you it is not the kit and you have something wrong and the only way to figure it out is to take all the kit out and put stock stuff back in and do the test. That is double work so make sure you do it first.
I really didn’t intend to get too deep into clutching just wanted to help you focus your attention when you have one of these two conditions and this applies whether you have a clutch kit or not, stock vehicle or not.
Todd
