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Hate to resurrect this, but having issues again.
Just to recap. Batteries fully charged, pump directly connected to the battery per mercury instruction manual with fuse and proper gauge wire....

I made a post about it in the past.
Yes it does work, what he is doing it taking the air inlet assembly off adding a cold air filter and replacing the door with a scoop to allow the engine to take...

Thank you very much Don.

I made a few phone calls yesterday and other than being told (bring it in) which I was prepared for, one shop actually mentioned it could be do to a low charged battery any thoughts on this?
I am...

I did try that and I still get the same results unfortunately no matter which position I have the wheel in.

3B098123
2021 300r

Hey all, So finally got a chance to get the boat out with some decent weather and noticed in random spots in when spinning the wheel left or right I get this real hard spot...

The down and dirty of it is, Speed density systems work first by measuring the temperature of the inlet air and then the manifold pressure via a manifold air pressure sensor, or MAP sensor. They...

Rockbottom Designs here in Texas has a replacement door assembly scoop. I believe the owners name is Jimmy, has some pretty good data on running them on the 450r and 300r....

He has several videos on the facebook page https://www.facebook.com/profile.php?id=100094757504593
I'll say that's their claim is up to 8mph that could be a stretch, however I do know that it has...

I know guys down here on the Texas coast are running a door that replaces the stock one with a scoop and they are seeing up to 8mph and 3-600 rpm increase. Benefit with this one is you don't have to...

He isn't forcing more air into the engine itself, he is just allowing more air into the cowling as it was explained to me to give the engine the ability to have access to more air.

One photo is of a Doug Wright boat, the other with the aluminum scoop is a 300r. A lot of the people that commented on my post on the page were either 300r's or the pro xs with a few 450r's mixed in...

3B098123
2021 300r

Found this one a performance page on facebook that I am apart of. The designer of the part claims you'll gain 300-600 rpm and 2-6 MPH, he claims these engine cowlings do not...

I actually have flushed mine since day one on the flush port ( have lower water pick up extensions and cannot use muffs and don't own a tank) and my temps never go over 145-150º until the thermostat...

I wonder if you're having the same issue I had I would overheat at idle but be fine otherwise. My issue was the seal gasket for the impeller housing had blown out once that was changed and added some...

Please disregard this post, after some side by side research of the diagrams I have found out that the 300r does not have the equipment for the exhaust, however the 300r AMS does have this feature....

That was my thought. He told me there is a setting that needs to be turned on that will add an icon to the left side of my screen that will give me the ability to which between modes. To go head and...

3B098123
2021 300r

I need some clarification on this. My Merc dealer / shop swears up and down that I have the ability to enable or disable sport exhaust mode on my 300r though my vessel view...

Don, since this keeps being brought up it has me second guessing my life choices :roll: about just using the under the cowl filter only.
I see you have posted the number for the bypass elbow, so my...

Thanks I’ll go head and remove the external one as it has no sensor or anything just a screw on filter

3B098123
2021 300r

So I've had my boat for about a year and I've come to a point where I was going to change out my external Fuel water separator (sierra 18-7945), however I have read here that I...

s/n 3b098123
2021/merc/300r




While having my prop rebuilt I took this time to do my water pump (first impeller change I only have about 50 hours on the motor but I run very shallow dirty...