1997 Challenger 787- No Propulsion- HELP

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easygoin4

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Got this boat last year from a friends neighbor (original owner).
Went thru engine for rave valves.
Took out first time since engine work this weekend - wont go forward.
Engine ran fine, and would idle forward, but as i accelerate it was like putting a car in neutral, hit 4500 rpm and would not push forward.
I did get up to 6500 but only for second- did not want to ruin anything w/o propulsion.
Original owner said never had problem like that.
I did take out pump last year new impeller delrin seal and neoprene pump seal, prop looked really good.
Seems like major cavitation- just no thrust at acceleration.
Any ideas..
Thank sin advance..
 
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