I put a 685 on mine...I honestly cannot tell the difference vs. the original 650. Well, one difference is I no longer have to add oil every 100 miles. And, I suppose it's a bit smoother. But as far as oomph goes...well, the KLR is not known for oomph. If I want to go fast, I ride a different bike.
A KLR makes, what, 35 horsepower or something? So, you jazz it up, and maybe get 40 horses. Not enough to notice..
Slow and steady wins the race many times.
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"Chet from Chattanooga"
2009 KLR, blue