Buy a tube of EP (extreme pressure) automotive chassis grease and grease the front axle, poke a bit into the speedometer drive. Coat rear axle, pull and coat the swing arm and rear suspension bolts, bushings, and bearings. KLR's are notoriously short of grease and these areas rust + seize.
Pull the rear brake pedal pivot, clean & grease. The steering head bearings also suffer from needing grease. I drill the right side of the steering head tube to install a grease nipple. Pump the steering head tube full of grease then a pump of two each year and you're good to go.
Re & re and grease the lever pivot bolts as they are likely dry as popcorn and will work so much better when lubed.
2007, so made almost 8 years ago. Change the brake fluid unless you know that it has been changed within the year. Change yearly. Also change the coolant as 7 years is too long.
By 7 years I'm thinking that wheel bearings are about ready for replacement for peace of mind.
Valve clearance check and replace the doohickey if not already done.
I'd also replace the headlight fuse with a 15 amp as it is possible to hold the dimmer in the center position so as to blow the headlight fuse.
Likely the throttle tube is also dry as popcorn so remove, wipe down and lube makes for nicer action and reduces wear.
The bowl vent "T mod" is one of the best early mods and make sure that the plug is on the little oil catch bottle below the right footpeg.
That's a start.