I have a 2000 929. It has 32k miles. Earlier today I was on the interstate and I was in 6th. I felt like there was no power, I would accelerate and at about 70 it just wouldnt go. When I hit 90 it felt like the power had kicked back in. It was also in every gear this happened. Now anyway.

I just changed the plugs which was stupid annoying, and it helped a little, but it still does it. Any suggestions?

 

I think I may have found my problem, but im not too sure. It might have something to do with the servo motor? Im not sure.

The main thing is it feels like im only running off 3 cyclinders until sometimes it kicks in the 4th.

 

It's possible the exhaust valve the the servo moves is jammed up a bit. Is it always between 70-90mph no matter what gear, or is it actually an RPM based problem? The valve should move at 3k rpm and around 7k rpm. I think the sticky about it has the exact numbers. You may also have a flaky coil, but that should trigger the FI light with a misfire and tell you which cylinder. You can't loose anything by taking the valve off and cleaning it out. I've never done mine, but I'd imagine ez-off oven cleaner would do the trick. That's what I use to clean my turbo when the exhaust vanes gum up.

 

Where is the servo motor even at? And its like pretty much every gear. Before I changed the plugs it was in every gear just 3 cylinders. Its not as bad now though.

 

Look underneath your bike where the and find where the header pipe goes from 4 into 2 that unit bolted between the 2 halves of the exhaust is the HTEV it will get carbon build up on it.

I hope this works since my bike is doing the same freaking thing right now. It is all gears all speeds, less noticeable at higher RPM, but almost sounds like engine sputtering and starving for fuel. Please pass along if this fixes the problem.

 

What i did was I took the cables off the servo that ran to the HTEV (im assuming thats were they run) and I just put the HTEV back on and kept the cable to the airbox flapper still connected and now it runs fine.