GT175 Mods

Hi there, 

I have a GT175 (89 model) on a Basshawk bass boat. Hull weight is 1200 pounds, and it is rated for 175hp. I was wondering what I could do to perk up the power output of the motor a little, and what sort of prop you would recommend for it. Right now it has a 25 pitch shooter 4 blade, on a 6 inch set back plate. It has transom wedges on the top of the plate between it and the engine. 

I would also like to know what the safe upper limit is on rpmís for this engine, I have not had much success on the internet finding specís. 

I asked on a bass boat forum, but they donít support modding engines. 


The engine has a 5800 Rev limit that is part of the ignition system. Getting more power on that engine is very expensive and it doesnít like todayís fuels very much. As you try to get more power (by compression increases, etc.) the tolerance is gone and it will fail unless race fuels are used.




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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