Yes you need to do the Doooooooo,
The spring is too short I just did mine last month, replaced the spring and the adjuster.....you might as well do the adjuster at the same time as the spring as the genuine adjuster is not as well made as the aftermarket replacement.
also grease your swing arm bearings and steering head bearings.
Fit HID lighting kit, 0.30" shim under the carburettor needle and a 150 main jet.
Apart from that the 08 KLR is a nice bike.