what would cause low rpms on a jet outboard take off only tacking about 4700 rpms normally would tack 5000 rpms seems sluggish. could it be a fouled plug

My first step would to ensure the butteflies are fully open at WOT.

Hot weather/ E-10

hot weather and e10 would do this iwas thinking the same thing it did it one other time i bought some stabil fuel additive for e 10 hope thats the problem

Stabil will not improve the performance. Only cooler weather and/or non-ethenol fuel will.

i also checked throttle cable it had about a quarter inch more to open the butterfly's open all the way and i think my reverse gate needs to be adjusted as well so for completely tearing the boat down and rebuilding it i did alright

you guys was right took it out this weekend ran like greased owl poop