Temperature check on 1976 Johnson 25 HP (25R76E)

[andreipou]

Is there an easy way to determine temperature of the running power head?
Manual says to use some heating sticks 125F and 163F, but I think it is old.

Is there something inexpensive?

What should be the right temperature?

Thanks.

 

[Whoopbass]

Re: Temperature check on 1976 Johnson 25 HP (25R76E)

Harbor freight has a cheap laser pointed thermometer for $8.00. You just about have to be touching the surface of the item to get an accurate reading but it does seem to work.

There is also a sticker with some type of built in thermometer that you can apply to wherever and get a temp reading. They sell them at Motorcycle shops. I think there about $6 for 3 stickers.

My Johnson 35 runs about 140-144 degrees in a barrel.

 

[dade61782]

Re: Temperature check on 1976 Johnson 25 HP (25R76E)

they are called temp sticks you can get them at a welding supply. they dont melt until the specified temp is reached

 

[tashasdaddy]

Re: Temperature check on 1976 Johnson 25 HP (25R76E)

i keep one of these in my boat bag, http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=93983
temp should be 140 -160 no higher. you can actually watch the tstat open and close with these thermometers.

 

[andreipou]

Re: Temperature check on 1976 Johnson 25 HP (25R76E)

Good stuff!
Thanks.