thanks again ray for the info and your help. here's the scoop. the guy i bought the boat off was the one who put the 5k in the motor to restore it. he ordered 750's for the boat. i couldnt wait for them to come in or him to get them, so i settled for the 450's at the time because i wanted the boat bad. not really knowing what i was doing. he told me if i ever decide to put the 750's on there that motor would come alive. dont get me wrong the boat does run great. just like u were saying its supposed to run. when i hit it it responds. i never seen it ice up thoe. it get's real cold, never seen it ice up. i just feel i can get a lot more if i went bigger. did a cfm calulation for my motor it calulated 805 to 1,081 cfm's needed. so i figured 1o81x1.25=1351cfm. so maybe 2 660's or 650's or 600's.really undecided right now. i know i have a while till next season. maybe i can come across a deal on a set and go from there. might just test for vaccum leaks and leave it alone. i dont know yet. i know the true meaning of boat thoe, break out another thousand. ill even try to get with hd rider and tony and try to get some info on what u wre talking about.i want to put some pics up but dont know how. can u give me some info on that. thanks again sorry for the headache.

good info gt. i really dont know to much on carburetion or anything. your saying i dont need more cfm as much as i think i need. or with the tunnel ram i should use more cfm. i just feel the motor could use more fuel.

ray what do u mean by high duration cam.

thanks for the info cakemoto.

guys thanks for your info keep it coming. im ready to unload my 450's hdrider what ever that means.

alright newbie.