I would guess they didn't want to spend the money on a eng. they were going to drop. Don't some of the after mkt mfgs ofer valves on the big bore kits for the 800 trip? This is the only way I can think of to valve it.
6Mile, I owned a ZRT800 for 5 yrs b-4 my ZR. The power valves would give it better acceleration, to prove it, ride a ZRT600 w/them and one w/out, you'll notice a difference! I just don't understand why they put them in the 600 and not the 800, knowing that niether engine would be around much longer.
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