120hp Johnson Outboard??

[phatdaddy]

all good advice above, i would add just one thing, test your t-stats and verify at what temp they are operating. i've tested brand new ones and had them not open at the suggested temp or open at two temps 20-30 degrees apart from each other.

[greateastern]

Ok, I knew I could count on you guys, it is a 1990 not a 98. and Yes, I have have installed a new water pump, and yes I have put the stats in water to check operation temps.(I feel that they open way to late 180-190 degrees) I have even changed the sending unit to make sure of all things. Next I'm going to go with a new gauge no more colores I need numbers) To me the stats open up way to late, I heard about the stats that where mentioned, that they use down south asked my local supplier and he said that he has never heard of it. The stats I have in are white in color I read about a black colored stat that runs cooler??? any thoughts on part number??

Also I bought new stats and the motor overheated in the drive way with the garden hose. Put the old ones back in and it is fine. Just in the bay, running up on plane (4000 rpm) she runs to hot for my comfort.

Thanks,

[Skools Out]

yeah i run the black ones as they do run cooler you can open the black ones and clean them plus you can gut the black ones then they will still hold back water and make the motor run around 170* when gutted. i'll see if i can find the part number on the black set for ya.

[Skools Out]

hey just a thought does your t-stat cover housings have water hoses off them or are they solid covers? the type with tubes are what Ferm was talking about the bypass system the solid covers don't open bypass at higher rpms

[greateastern]

they have hoses on them, i do not understand the bypass system. But ferm seemed to get it right, higher rpms motor runs hotter lower rpms motor runs cooler. One would think water pump but pump is new. Just called supplier again they do not know of any other stat but the white one. I' tempted to just pull them out for the summer and put them back in, in the fall.

[Skools Out]

take the diverter valve apart and clean it on the bypass system it may be stopped up or make sure it works without the motor running move the throttle level wot then look on the side at the bypass valve make sure it is moving.

[greateastern]

skool

Thanks for all your help, got it under control for now. Do you know the part number to the black thermostats? The cooler stat. The parts guy thinks i'm crazy when i told about it.

Thanks Again