Thermostats

Some of you probably saw my post in the general bb topics. I have a 95 Johnson 150 fastrike with which I have had trouble from day one. Bought it used four years ago. My mechanic has pulled the thermostats to allow the engine to run cooler. Everyone on here seems to think it is a bad idea due to cold seize. I don't run in water colder than 50 degrees, whether that makes a difference or not I don't know. Has anyone else ever run without thermostats and what was the result. Thanks for your assistance.

It can cause your motor to run hot by taking the thermostats out. The water travels through the motor to fast to absorb the heat from the motor. The thermostats slow the water down giving time for the heat to transfer from the metal to the water.

sure about that, removing them should make it run cooler.

Whithout thermostat, your engine will work under 125F, at this temperature the mix of fuel and air, won't evaporate enough to make a good combustion to run. To run at the same speed the throttle will be more open and will need more fuel, and the gas/milage will go down.

Any engine need work with a temperature at low speed and at high speed, this temperatura must be almost the same, if a engine stay at idle for long period and hit the throttle, the acceleration will alow a cold water to get in, if this engine don't have a thermostat valve, the engine block can crack.

If the engine is too hot, and without termostat, run better, the problem could be on impeller or at under power head passages.

Choose a better mechanic

Ricardo!

well the water is cooler because it does not absorb the heat from the motor---but that means that the motor is running hotter than it should--temp sensor monitors the water temp in the engine----if it flows all the time it never absorbs very much of the heat in the engine it will show to be running cooler--in fact the metal the motor is made out of is getting hotter ----ouch

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wmaybin &raquo;</TD></TR><TR><TD CLASS="quote"> I have a 95 Johnson 150 fastrike with which I have had trouble from day one. Bought it used four years ago. My mechanic has pulled the thermostats to allow the engine to run cooler. Everyone on here seems to think it is a bad idea due to cold seize. </TD></TR></TABLE>

Install the thermostat kit #435597, that has the correct spring, t'stat, and cover. Make sure the rubber "ring" inside the t'stat cavity is not out of round or causing the thermostat to stick, they distort during severe overheating.

Also make sure you have the 5001594 water pump kit installed (20" shaft motors) as the 5001595 kit looks almost identical and will cause the 20" motor to overheat at high speeds.

Seahorse is on the money, this will work, do it all the time. If the thermostat seat is sticking to thermostat, you will have to remove the cylinder head to replace it. Get a manual or have a tech do it. It's not hard,but it is not the same as old style engines. http://www.bassboatcentral.com/smileys/wink.gif

You guys are really helping me out and I appreciate alot. One of you may actually have a solution to my problem. You see nobody has really been able to figure it out and I am far from mechanical when it comes to outboards.
The problem is that after I run from point a to point b and fish the engine will not start. After it sits for a while, sometimes hours it cranks and runs again, keeps repeating this. I have been through 4 mechanics, one did nothing, one changed my fuel pump, one put brand new carb in and a switchbox and this last one who I will admit is shadetree, has pulled the therms. None of them have been able to get it to shut off and not restart for them. We even put it under a load on the trailer to get it good and warm and it would not act up. As soon as I take it fishing it craps out. Any ideas???

How far are you from Lebanon TN, just east of Nashville?

You come see me....make it have the problem and I will fix it, if I don't fix it you don't pay.

Sound Fare?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wmaybin &raquo;</TD></TR><TR><TD CLASS="quote">
The problem is that after I run from point a to point b and fish the engine will not start. After it sits for a while, sometimes hours it cranks and runs again, keeps repeating this. I have been through 4 mechanics, one did nothing, one changed my fuel pump, one put brand new carb in and a switchbox and this last one who I will admit is shadetree, has pulled the therms. </TD></TR></TABLE>


So you don't have an overheating problem?

Now that we know the whole story, you should have told us this at the beginning that you wanted help with starting.

You said that someone put a new carb on, you have 6 carbs on that motor. Are you saying that they replaced just one of the six?

Chances are you have a "heat soak" problem or possibly a heat related ignition failure. Usually not to hard to fix, but may take a few times to duplicate the problem if the "red headed stepchild" from Nashville will fix it for you.

Seahorse!

Stop picking on my "adopted" step headed Red child. http://www.bassboatcentral.com/smileys/roll.gif http://www.bassboatcentral.com/smileys/roll.gif http://www.bassboatcentral.com/smileys/roll.gif

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DoferGofer &raquo;</TD></TR><TR><TD CLASS="quote">Seahorse!

Stop picking on my "adopted" step headed Red child. :
</TD></TR></TABLE>


Aw, c'mon, he's old enough to stick up for hisself! http://www.bassboatcentral.com/smileys/smile.gif

...but he could always use a tutor and a mentor....

Redheaded step child here...someone call me????? http://www.bassboatcentral.com/smileys/roll.gif http://www.bassboatcentral.com/smileys/roll.gif http://www.bassboatcentral.com/smileys/roll.gif

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RUSTY63 &raquo;</TD></TR><TR><TD CLASS="quote">Redheaded step child here...someone call me????? http://www.bassboatcentral.com/smileys/roll.gif http://www.bassboatcentral.com/smileys/roll.gif http://www.bassboatcentral.com/smileys/roll.gif </TD></TR></TABLE> HUH!!!!! YOU RANG?????? http://www.bassboatcentral.com/smileys/wink.gif http://www.bassboatcentral.com/smileys/roll.gif http://www.bassboatcentral.com/smileys/roll.gif http://www.bassboatcentral.com/smileys/roll.gif
wmaybin, I drive three hours to see that redheaded step child, He's that good and I know others that do too!! Worth it!! http://xs-s.com/zf/images/smile/emthup.gif

Now we need to fix the cooling system and the fuel system. Man this has gotten deep!!! We might even have a bad pack!! You better take it to Rusty, you can't beat a proposition like that!!! http://www.bassboatcentral.com/smileys/wink.gif

is rusty propositioning guys he dont know again-----boy i hope he's had a few---hate to think he's doing that sober http://www.bassboatcentral.com/smileys/Laugh.gif http://www.bassboatcentral.com/smileys/Laugh.gif http://www.bassboatcentral.com/smileys/Laugh.gif http://www.bassboatcentral.com/smileys/Laugh.gif http://www.bassboatcentral.com/smileys/Laugh.gif http://www.bassboatcentral.com/smileys/Laugh.gif http://www.bassboatcentral.com/boardstuff2/beers.gif http://www.bassboatcentral.com/boardstuff2/beers.gif http://www.bassboatcentral.com/boardstuff2/beers.gif

hey john---BITE ME----- http://www.bassboatcentral.com/boardstuff2/beers.gif

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rudetech1 &raquo;</TD></TR><TR><TD CLASS="quote">You better take it to Rusty, you can't beat a proposition like that!!! </TD></TR></TABLE>


I think our good ol' boy Rusty had a few too many St. Louis soda pops when he made that promise! http://www.bassboatcentral.com/boardstuff2/beers.gif http://www.bassboatcentral.com/boardstuff2/beers.gif http://www.bassboatcentral.com/boardstuff2/beers.gif

you guys are nuts! No we don't need to fix the cooling system or the fuel system. I have already had a certified omc guy rip me off with a new fuel pump which he swore was the problem, and another guy rip me off with 400 bucks worht of new carbs that I obviously didn't need either. I have actually considered the pack myself. I am taking it to the lake tommorow (without thermastats) and see what happens. I am taking a spark tester to use if it pulls its shit. That way I can determine if it is getting spark. If not I know it is electrical, If it is maybe not, at least I will have more of a direction to take. If I blow the damn thing up due to no therms then I will finance me a new merc or yammy and be done with it. Thanks for all your guys advice. Oh and by the way I appreciate the offer but with gas at 2.87/gal it is too far to tow from Reidsville, GA (fifteen miles from Vidalia) to Tennessee. Thanks anyway.

Spark testing is a good idea. If your pack is breaking down, it should show up..You would be surprised to find out how many things can go wrong with any engine if the parameters are'nt met at any point on the fuel, electrical, or the cooling system. They all have to work together toget a good burn. You should still run thermostats. These rules apply to any engine, Merc, Yamaha, Suzi,Tohatsu,Nissan,Yanmar,and etc. Good luck. Let us know what you find. http://www.bassboatcentral.com/smileys/wink.gif

I will let you know as soon as I get back.