Hey, I was searching threads and found this, my 05 RMK 800 is doing the same thing. It will pull to 7k and then get stuck there. I just took the sled out for my first real test ride today and when playing with it here is what I found.
It does it most often when running below 40mph and sometimes holding wide open still it will come out of it and after being at 7 for say 5 seconds will suddenly open up to 8 and pull like hell.
I also tried letting off the throttle and getting back into it and this tended to get it to pull to 8k after it stalled out at 7k. like the origional post said it does it intermitently. so i was unable to narrow in on any specific thing that causes it, but going slow and then punching it will create the situation about 80% of the time. I tried all differen speeds and throttle positions
As for the sled, (let me start by saying it is new to me an I havn't dug into the clutching yet) But it is an 800 VES with 151" track. I put on an SLP single pipe and can, it has SLP Big horn airbox kit, Flow rites, and the SLP prefilters. I set the jetting and Needles to what SLP reccomended, but am going to try to drop that down. (the sled has great low end power, but when I hit the mid or where the main takes over, the sled falls on it's face power wise, then recovers up top some.)
When reading this thread I didn't really see an answer, so i'm hoping to revive it for some suggestions. I will dig into my clutches tomorrow and check to make sure I have the right helix and see what weights and springs it has.
Thanks in advance for any help if you've run into this before.