Starliner Setback


I have a 1987 Checkmate Starliner that I had to repower. I found a leftover Merc. 3.0L 225 EFI. It is mounted on a CMC hydraulic jackplate with about 5 1/2" setback. I'm running a 23" Tempest Plus and have seen 68 mph on the speedometer at 5800 RPM. How much additional setback would you recommend to start with this setup? Any additional comments or opinions on how to improve performance would be greatly appreciated. I know it's not a Hydrostream (which is what I wish I had) but it's what I have and it is very versatile with all of the accessories I have on it. 

Thanks in advance.


Oddly enough we do all the rigging for Checkmate boats of Fargo. Have rigged quite a few of them and the 5 1/2 inches is enough. With a 26 or 27 trophy we run in the mid to upper 70's. With a 27" laser 2 we ran 73mph. All more set back did was make the boat run stupid in the mid range speeds and the hole shot disappeared. All of them now have the CMC 5 1/2 plate on them. Granted your boat is not "new", it is of the same basic design. Try some bigger props as the rev limiter is right where you are.




Please submit whatever questions you have to  All questions and answers selected will be displayed on this page as they come in.  Note: though all boaters are welcome, priority may be given to I.H.R. members.  Randy can not be held responsible for any advice given.  Though his information and expertise is second to none, he has no control over what you do with your boat.  It is up to you to boat safely and act responsibly, and his advice is only to be used as a guidance for your high performance boat/motor of which you are the one responsible for the risks involved.

Mark C.


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