Hey guys, I'm really really hopeing you guys can help me out. My sled is a 2000 600 XCSP with a 700ves transplanted in. My sled has no top end power anymore, nothing. It idles almost like normal, Once warm it want to die sometimes. midrange is normal up till 6000rpm, then after that it just bogs. The highest rpm I can get is about 7100, I don't really have any way to describe it, it has NOTHING after 6000RPM, it runs normal till that point, then just bogs. It started as a small miss fire, or quite bog, always for only like 1/4 second when WOT. Then one time I was ripping over a field at WOT, it had the normal misfire once in a while, then it just dropped to 7000rpm, and it's been there since. I can run it on the stand, and hold it wide open, but it still just bogs. It doesn't ever fall on it's face really, it still gos, but the power is the same at 7000rpm, as it is at 6000. I have tried almost everything. I had the carbs off, they look fine, I replaced both jets because they had been over tightend, and cracked. I checked my VES valves, they were clean, but one bellow was ripped, so I replased both with the updated orange ones, I found out one carb boot had a rip, and the other one was on it's way out, so I replaced both, clutch LOOKS fine, belt looks fine other that a few cracks between the inside ribs, compresion is at 124.5 in both sides. I have tried running it on half choke, I have tried diffurent plugs, not new, but no change. None of these things have made it any better at all. I'm at a loss of what it could be. The chassie and clutches have almost 6000 miles, could it just be time to rebuild the clutches? Other than the things I have already tried, my dealer has no clue. O, I should mention that I am running pod filters on the sled, so the carb vent lines are just hanging there, but it's been good like that for 1000 miles, so I don't see how that could be the problem.

Did you check the reeds? The reeds may be worn out and are just not able to snap shut at higher rpm anymore.

I would absolutely have the clutches rebuilt. This may not be the entire problem, but it is definitely not helping matters. You may have a broken primary spring. I saw this happen on a 900 RMK once and it acted similar to this (it would not pull full rpm and was stuttering). You could not visually tell that the spring (Almond) was broken until you pulled the clutch cover off and actually pulled the spring out.

I broke the circlip on the slide needle once. The sled would run fine to 5500 rpm and wouldn't pull past that. The slide would come up, but the needle would not so the main jet could never supply any fuel. This kept the rpm from coming up, and loaded up the other cylinder and caused all kinds of problems. Once again, it was kind of tough to figure out.

The fuel pump may also be wearing out and cannot supply enough fuel now to keep the carbs full at higher rpm. Or it is just shot and you are running on gravity feed (if the level in the tank is higher than the carb float bowls) and it cannot get enough fuel ( I had this happen once also). In this situation, it will idle fine, but once the fuel demand at higher rpm overcomes the fuel flow rate, well you can figure out what happens.

I am kind of grasping a straws here, but I hope that these are two things that you have not already checked. And put some NEW plugs in that motor!

I had the reeds out yes, they looked completely fine, but I wasn't really checking for wear, just to make sure they were clean, I didn't see anything wrong with them then.

I'll look into getting the clutches done. The spring I have in there (almond) Is almost new, only around 700 miles on it. So I don't think that's the problem.

Fuel pump. Could be I guess, but it wouldn't be running on gravity flow right now, it's down to under 1/4 tank of gas. But It does seem to push a lot of gas though right now. Have also noticed it's starting harder when warm, two pulls with some throttle to get it going, normaly it would be one pull with no throttle needed. Could be a fuel issue.

If the problem is showing up more often when it is warm I would have your dealer check your stator. I have seen many that will operate normally when they are stone cold but as soon as the sled warms up you get misfires and weak spark. We had to limp one back to the trailer last year by running it cold and then when it acted up it would have to sit and cool down and we just repeated the process. Good luck.

It does it when hot or cold, no matter. It's got to be the exaust valves, or a fuel problem. One of the two. Clutches may be in need of a rebuild, but they are not the whole problem, clutches wouldn't have started with a sputter, then turn in to this. Can't be the problem.

Ok update. I had the VES apart again, and the little holes are open and clean, so the ves is working like it should, no problems there. I also took my carbs off, and am takeing them to the dealer today for a FULL going over.

Well boys, she's up and running. I called my dealer before they got a chance to open up my carbs, and we decided I would bring in my primary and they could go over it before going over the carbs. Well the primary ended up being the problem. Something in the clutch was worn out (didn't say what part) And one weight was sitting in there at an angle and hitting the spider. That was all. They shimmed it up a bit and away I went. Works as good as new. THANKS TO EVERYBODY THAT HELPED OUT ON THIS ONE!!