TROUBLE SHOOT JOHNSON 60

[DONCOX]

I HAVE A 1990 JOHNSON, VRO DISCONNECTED AND MIX OWN OIL/GAS. PROBLEM IS IF I GO OVER 4000 RPM THE OVERHEAT HORN SOUNDS AND ENGINE SPITS DOWN TO ONLY RUN AT IDLE SPEED. I HAVE HAD IT RUN ON DYNO MACH AND WAS TOLD IT WAS TAKEN CARE OF. I AM MIXING 50 TO 1 FOR OIL IS THIS SUFFICIENT? WOULDN'T IT OVERHEAT AT 2500 OR 3500 RPM AS WELL AS OVER 4000? COULD IT BE A FUEL SUPPLY PROBLEM?<br />THERMOSTAT HAS BEEN REPLACED AS WELL AS WATER PUMP. WOULD APPRECIATE ANY SUGGESTIONS.

 

[MCM]

Re: TROUBLE SHOOT JOHNSON 60

Welcome Don, first thing to do is to turn the caps lock OFF on your keyboard, it comes across as shouting, its also hard to read <br /><br />Secondly it sounds as though it has the S L O W feature in which case you'll need to verify it actually is overheating or whether its a faulty switch or sensor etc.<br /><br />Not sure if yours came with that feature mind you

 

[ob15]

Re: TROUBLE SHOOT JOHNSON 60

I'm pretty sure that motor does have the SLOW mode. My 89 50 does.<br /><br />Mine did that once and if you t-stat is the same as mine, you don't have to removed the head cover to remove it. I took mine out and ran it like that for a while on the muffs. It helped flush the system and get rid of any blockage. Hope that helps.

 

[duke3]

Re: TROUBLE SHOOT JOHNSON 60

Don your motor have the SLOW mode.<br />I have an Evinrude 60 HP VRO from 1990.<br />Control temp. switch as MCM hase told you.<br />The temp. switch can be faulty, and will then give you SLOW mode.<br />Also control, that the wirer from the temp. switch is TAN blue (broun/blue). If only broun, the alarm.temp. will start apx. 10 F before, as if it was the TAN blue switch.<br />Also if your TAN system hase a ground some where, it can give you alarm (SLOW).<br />Also there is a servicebulletin, according to the cooling-water there is going out at the pee-hole.<br />You can try to disconnect the wirer to the temp. switch, and test run it for a short time. If no SLOW, the fault must then be the temp. switch.

 

[duke3]

Re: TROUBLE SHOOT JOHNSON 60

And yes, it can overheat as well at 2500 or less rpm. <br />Since you are mixing the gaz by your self, then be sure, the alarm wirers to your VRO pump and oil-tank are disconnected. <br />Overheat alarm, is one steady alarm. No oil flow is alarm every 1/2 second, and low oil in oil-tank will give alarm every 20 second.<br />What is your alarm, when the motor are going in SLOW ?<br />Anyway, Im also mixing the gaz by my self. And I have disconnected the whole alarm system, so it will not go in SLOW. Then from my alarm switch, I have installed a buzzer-alarm, and an alarm light, if the motor is overheated. Then I can manual slow down. Also I have installed a temperatur gauge, so I always can see the actual working temp.