Definitely see if the coil is at fault first.
HT leakage is quite common on all the XTs in damp weather. It is usually the joint between the lead and the coil that causes problems. Once dried out seal that area with silicone grease. Try and avoid silicone/gasket compounds that set into a rubbery substance as they invariable crack/come adrift at the edges over time with the continual heating up/cooling down and actually make the situation worse by trapping moisture or sucking it in through capillary action.
Failing that, it could be the TPS breaking down. The track inside can/does wear away eventually, giving erratic resistance reading and weird misfire at certain rpm.
Here's an example of a very similar sounding problem to yours...
http://www.xt660.com/showthread.php?t=23102
Started off as a suspect coil because it only appeared to happen in damp weather, but ended up being the TPS.
Quote:
Originally Posted by
keithy2
If you have the kev mods fitted I am pretty sure your resistance readings will be way out. I would have a word with kev.
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Neither of Kev's mods affect the resistance measured at the TPS.