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    J90 wet plug Cyl 1

    Last week I ran a full decarb on my 1984 J90, then ran a compression test with all 4 cylinders showing between 120 & 125psi. I then fitted a new set of plugs and took the boat out yesterday for a spin.. Top end speed was a little off so back at home I checked the plugs to find the plug in Cyl 1...
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    1984 J90 compression test results

    Just ran a compression test on my 1984 J90, cylinders 2,3 & 4 all test at 110 - 115psi. Cylinder 1 tested at 95psi. read the manual on Selec and it's a little confused at the spec, stating most recent updated recomendation from Johnson at 20% max variance between cylinders.. does this look...
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    J90 VRO Wiring

    Hi.. I have a 1984 J90 that's had the VRO removed and a mechanical fuel pump fitted. I have managed to get hold of a VRO pump and wanted to use it to pump the premix fuel. Does anyone know what the wiring is for the VRO pump.. I have 4 wires: black, (looks like earth or Neg)...
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    1984, J90 Fuel pump problem

    I have a 1984 J90 MLCRD and have been having some problems with rough idling and low power at WOT.. I stripped the carbs and cleaned them, (did not reall see any problems there). fuel lines all look ok but still seem to have a high power issue at WOT. This motor has been fitted with a...
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    Warm Starting problem, 1984 J90

    I am having a problem warm starting my 1984 J90, starts great when cold (after priming and pushing in the key to choke).. and then runs at around 800 rmp smoothly after warming up. After a run at WOT and sitting for 20 - 30 mins however it does not want to start again.. I have to play around...
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    Johnson 1984 J90 , Temp Sensor wiring

    Hi, I am trying to sort out the temp sensor wiring on the above engine. There are 2 sensors (1 on each head) which connect to a tan wire.. Am I right in assuming the sensors are open circuit and short to ground when overtemp? Also I found a 3rd tan wire which was not connected, this was close...
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    Replacmement Prop Bush

    Anyone know where I can buy a replacememnt bush for my Rapture SS Prop ?<br /><br />thanks...
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    Failed prop Bush

    I just fitted a new Rapture stainless steel prop to my Johnson 135hp motor and after 2 outings the bush has failed. The first outing was around 40 miles, almost all in deep water > 1000ft.. the failure happened only 4 miles into the 2nd trip and again in deep water. for the most part the trips...
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