[quote= On stripping the pot down, there does seem to be quite a bit of wear, (sunlight through the piston rings), Is this enough to cause such a massive change in response, [/quote]
"pot" means cylinder?
piston rings are measured at the gap...I don't know the specific KLR specs, but "ballpark" you should have about .010"
the rings will be shaped so the explosion forces the rings against the cylinder walls, and they have to float.
...what can happen when sitting is the rings stick in the carbon-cruddy grooves of the piston and don't expand against the cylinder walls.
do a quick compression check...you want to see 125psi+...100psi will run, but not impressive....if compression is low, it can be crud under a valve seat, stuck rings, or blown head gasket because young Pedro had your bike at the hill-climbs in your absence...
it sounds like it's getting spark but not gas...another thing to look for is dry rot in the intake boot causing a vacuum leak or something silly.
I would look for a mud dobber nest blocking a vent/drain tube, or float valve stuck.if you have spark and compression, I would suspect insects or mice doing what they do best...and your bike is just another opportunity.
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