89 Johnson 140 vro not revving

[thebottomfish]

Hey guys,

Took out the v for the first time this season, not thrilled.
I backed it down the ramp got it started, it sounded for lack of a better term, very soft and quiet. When I went to reverse out of the dock it had no power, then when I got it into open water,(50 ft away) throttle pinned at WOT the boat was seeing 7mph per my gps.
My problem is that I don't have a tach, so I can't know what rpm it was turning, but again it was very quiet, I'd say maybe 2k rpm if not less.
What could be the problem?
Spark plugs new, carbs clean, new fuel bulb, fuel filter and water separator filter. Started it on muffs in my driveway last weekend and it started, sounded and ran perfect.
But of course I didn't rev it on the muffs.

Any ideas where to start?

Thanks in advance

-garret