I have done three rebuilds on the KLR with the 685 kit, one which was my bike. There is a gent down south that sells the whole kit for the complete rebuild for 450.00
You will get all the gaskets,cyn, piston ready to go back in the motor.
I would replace the valve seals, plus check the valves while apart.
Here are some dyno results. http://www.patmanracing.com/klrdyno.htm
The 685 is good for about a 10% increase in power. If you want to go to the expense, a ported big valve head and exhaust can push it up over 30% or a total of 45HP.
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