Hi, i have a 70 hp,johnson motor and want to know if it has a S.L.O.W. mode for saftey of over heating. thanks for any help...
2007-11-24 00:56:22 · 9 answers · asked by JEFFREY P 1 in Cars & Transportation ➔ Boats & Boating
1977 70hp Johnson
2007-11-24 01:24:08 · update #1
Hey Jeffery, what it sounds like to me, from whats written, I'm interperuting that the motor is not runnig very fast at all when you apply full throttle to it and you're thinking it has a safety mode on it. Well with the engine as old as it is, the answer is NO. But there's a fixfor it. It could be several things from the carb on down to the points and condensors on the engine. You will need to take it to a very reliable outboard tech or shop you trust. Could also be that with that size engine it will have an alternator on it. the small odd ball looking thing with the small bely connected to it. you can bypass the alternator by dis conneting it from the wire hareness and bypass the alternator altogether. which means you will need to make sure you charge the batteries when you fiish fishing or riding for the day or have an extra battery or two with you. I had an old motor like this and ran fine out of water( not completly under load from being in the water trying to propell the boat forward) but in water it seemed as if it would bog down and run at lower rpms or seems like it would be in safe or slow mode. After I got ride of I came across a shop that had one identical and got to talking with the mechanic and he told me that all i had to do was bypass the alternator. I hope this has helped you out
2007-11-24 14:53:07 · answer #1 · answered by Joseph K 2 · 0⤊ 2⤋
A 1977 model 70 HP does not have S.L.O.W.
It does however have an overheat temp sender connected to the horn fitted inside the control box. To test the horn & circuit from the temp sender to the horn, ground the brown lead from the temp sender located near the thermostat & pressure valve cover ... top of cylinder head. To test the horn & circuit, pull / slide the black rubber sleeve back & expose the wire connector, then turn the ignition key to run & earth the lead to the block.
This test will activate the horn ... (provided the horn works & or the circuit is ok.)
The circuit is live (12 Volts) & to complete the circuit it needs an earth. Thats what the sender does at overheat ... (creates an earth)
This test does not however test the sender. To test the sender, the sender would need to be removed & heated & tested with an Ohms meter. Having said that i cant remember the last time i`ve seen a faulty over heat sender on a 70HP & removing the sender would require removing the head cover ... so ....
2007-11-24 21:06:47 · answer #2 · answered by John K 1 · 0⤊ 0⤋
Most in that area have a alarm in the control box> Look on the head top cyc wire coming out of the head water jacket>If you disconnect the and ground it 1 going away for the end it should set off the alarm>Is the water pee tube squatting water out>Check coils leave 1 spark plug wire off and start see if the Eng changes rpm>
2007-11-25 06:38:26 · answer #3 · answered by 45 auto 7 · 0⤊ 0⤋
What year is it?
Edit- I don't think so, not in 77. That is pretty old, but it's one of the best outboards ever made. Very few moving parts and very tough. But you are going to have to make sure everything is in good shape(water pump, t-stats, etc.). Make it a habit to look at the telltale stream as often as possible and pay attention to the way it sounds. You will hear a difference when it's getting hot and it will steam.
2007-11-24 01:06:34 · answer #4 · answered by ERIC E 4 · 0⤊ 0⤋
You can go up to whatever the largest size is in the same engine family. You'll have to have the reciprocating assembly re-balanced and re-jet the carbs for the change. The cooling system may have to be modified also, i.e. impeller or thermostat. What year and how many cylinders? It matters because in some of the largest sizes, changes were made in the exhaust systems to get the HP rating they did, that and bigger carbs.
2016-05-25 04:54:54 · answer #5 · answered by ? 3 · 0⤊ 0⤋
If your motor is over heating make sure your water pump is working....it should be spitting water out all the time. If its not working you can wreck your engine pretty quick.
2007-11-24 01:07:50 · answer #6 · answered by Anonymous · 0⤊ 0⤋
A trolling motor will work for that!
2007-11-24 17:41:49 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Most motors have a buzzer for that
2007-11-24 02:29:52 · answer #8 · answered by Shark 7 · 0⤊ 1⤋
no it doesn't, but you can put an after market temp gauge on it with a buzzer
2007-11-24 18:24:50 · answer #9 · answered by sevenout7 4 · 0⤊ 0⤋