Jetting or fuel mix might be a contributing factor, but I doubt it's THE problem, if only because I ran my KLR with stock everything (jets, airbox, the works) up to about 5000 meters/16,500 feet. It had hardly any power, and it was reluctant to start but never refused outright. I think there's something else wrong--alone, or in addition.
OP, I'm not sure you've posted what you've tried in the moment--you know, spark, fuel, the various safety/kill switches (some of which are surprisingly finicky), filters, electrical connections.... KLRs are pretty simple, and when something major goes wrong it's usually not too complicated. I posted some possibilities in the other thread which you just resurrected, but I'm not anybody's idea of an expert.
The two times I can think of when my KLR really would not start (dead batteries, detached connections, and kill switches aside) were due to 1) an exploded doohickey, and 2) a full tank of badly contaminated fuel. Oh, and that time I ran out of gas and for some unknown reason there was none at all in my reserve.
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