Jump to content

    If you want access to members only forums on HSO, you will gain access only when you Sign-in or Sign-Up .

    This box will disappear once you are signed in as a member. 😀


    You know what we all love...

    When you enchant people, you fill them with delight and yourself in return. Have Fun!!!

Sign in to follow this  

Is it possible to detune a mercury?

Recommended Posts

Looking at getting a 2004 mercury 50hp efi I was wondering what is the lowest hp you can detune it to? I am trying to get a motor that I can detune for when we go into the restricted motor areas and retune the motor for when we are fishing in the normal lakes.

Thanks Dan

Share this post

Link to post
Share on other sites

You can't. They will look at the stickers and serial plate.

Leave the motor up out of the water, slap a kicker on it. Good luck.

Share this post

Link to post
Share on other sites

You may be able to detune it but I don't see it being legal. A 50 will still be considered a 50, regardless if it's detuned or not. And the hastle of dealing with the CO and trying to explain to them what the deal is is enough to make me not think twice about it. Even if you removed the stickers, the size difference between a 50 and a 25 or whatever size you need is enough to make it very noticable.

Share this post

Link to post
Share on other sites

When we went to alaska all the boats on the kenai river were 35hp because the restriction on the river. Since nobody makes a 35hp motor there was a kit that the manufacturers used to sell that would drop the motor down to 35hp, it is legal to do I just cant find the kit to detune the motor. I have also okayed the idea by a CO in the area of the restricted lake also.

Share this post

Link to post
Share on other sites

Ok, so after some research I find out there are three different types of detuning kits. Linkage restrictor, Restrictor plate and chip swapping.

The linkage restrictor is the easiest to add and remove(takes only minutes), but only available for carbuerated motors.

Restrictor plates are a bit more difficult to add and remove and again, only available with carbuerated motors.

Chip swapping sounds like it requires a trained mechanic to install and remove and works with EFI motors.

Sorry, I don't know of any manufacturers that sell these, (maybe go directly to Mercury?) But if you do this, make sure you keep the invoice/receipt in the boat with you to make it easier to explain to any CO who may stop you.(I recommend laminating it)

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

  • Your Responses - Share & Have Fun :)

    • Possibility of moisture getting into them after washing the stove top and around the burners? My wife is good at that.
    • I get it, like the woman in the commercial. You are clever. 
    • Fleet Farm currently has Kingsford 15.4lb x 2 for $8.  About the same per pound as the summer sales.
    • We have a 6 year old Frigidare gas range and the ignitors on the top burners seem to be controlled by a ghost.  Sometimes one doesn't work, sometimes another.  Any ideas?   Thanks for your time. Tom
    • Make sure the adapter wiring matches the diagram on the cover of your female plug-in on your truck too.  Some use the center pin for backup lights,  yet others it is an auxiliary.  Also make sure that the lobe on the male is lining up with the lobe on the female plug-in too.
    • Trailer, one side, brake and turns dont work, same wire, same bulb filament.  Sounds like a ground problem.  With other tow vehicles its ok.  Are these 7 pin to 4s?  Could be the wrong adapter?  Not all 7 to 4 pins are the same.  Sometimes too that bad ground seeks its path through the hitch.  
    • Wrapping up the ice fishing after tomorrow. I’ve never owned a propane auger before this one and the one I have was bought used. Any storage tips?  
    • They are probably wired differently. I’ve seen this happen.    Actually I had a brand new 2015 Silverado 2500 diesel issued to me as a company vehicle and had issues galore with the factory wiring and the gooseneck trailer I was pulling. It was the biggest nightmare I’ve ever had and it was all with the factory Chevy wiring and integrated brake controller.   
    • Not the best time of year to be laying in the cold and slop under a truck tracking down wires but I have done that as well. Sounds like you then need to track down the yellow wire on the truck and see where it may be corroded and shorted somewhere.  
    • Thanks for the response leech. I purchased an adapter similar to that one with the test lights. Both trailers I tried are almost new and both have LEDS. All work great with Moms SUV and Dads truck. I’m thinking it has to be somthing corroded or a broken wire on the truck end. But figuring that out is out of my reach.