Another darn prop question

Hi All<br />I decarbed my 91 DT40 today and I think it all went ok , got a couple of questions. Used merc powertune for the job and used up a whole can. It still looks pretty black and crappy on the pison tops, definatly less buildup . Use another can or leave it a while and see what happens ?<br />Anyhow got it all thoughly warmed up and pushed the throttle all the way up , got it to peak at 6000 rpm for a few seconds. i always had a suspicion it was underpropped. I've got the standard factory suzuki prop on this motor 11.5 inch diameter and 13 inch pitch . I want to replace it and the diameter for a 15 pitch prop varies 11 x 15 for a Solas and 10 x 15 for the Vortex. I use the motor for pushing a 15ft ali boat at WOT for inshore harbour fishing for 45 minutes each way ( no skiing) , any ideas which would be better for me, the Vortex is cupped.

Re: Another darn prop question

With a 40, I would not over prop. I would tend to stay within a few degrees of the original as Suzuki designed the engine with the bet push for the power.

Re: Another darn prop question

For efficency go to the largest diameter you an fit, then choose the largest pitch you can turn at WOT. The 11 dia x 15 pitch is definitely the best bet. Choose SS if you can afford the difference over AL.

Re: Another darn prop question

Cool , thanks guys.