Hey David,
I noticed my 850 Demon has more play in the primary throttle shaft then I would think is normal. I put extra springs on it at one time to try and get it to come back farther. After d$cking with that for a while, I took them back off, went to two normal return springs and readjusted the carb. It works a lot better now.
I have the MSD small diameter dist. I completely took it apart and lubed it up. Then replaced the two small plastic pads under the weights. It worked a lot better after that. Besides, one of the plastic pads was missing!!
Scott