a hair more than the jump in displacement would warrant alone; so a 685 is 6% bigger.....stock power is 34hp, so with no other changes, expect a 3 hp boost or so. 719 would be more like 5-6.
Unless you are doing a max effort with porting, valves, cams, etc., I'd stick with the 685 though (as you can see) it isn't worth it from a $$$/hp perspective. The 685 is a popular upgrade to solve typical oil burning problems due to poor ring oil control and to lessen vibration....small output boost is just a bonus IMO. I personally wouldn't tear into a perfectly running KLR engine to do the 685 unless there was a compelling reason to do so.
you can get 2-3hp or so without messing with the engine internals; KLX jet kit, Uni-Filter, snorkle-ectomy, L-mod and a decent silencer..... Big power from a KLR is an exercise in diminshing returns IMO.....now about that suspension! LOL
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