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  1. J

    Quick Question about fuel line

    Getting a new DF50A in February. Could get it now but I need to do some reconfiguring on my boat first such as moving my gas tank more forward. Which leads to my question: What size fuel line do I need? 5/16 or 3/8? Relevant detail: Fuel tank move will require probably 14’ of fuel line. I...
  2. J

    Johnson 40 Idle Jet spits fuel

    1988 Johnson 40 Getting fuel spitting back out the idle air jet. Does it at idle and also at WOT. Motor doesn’t run well at WOT. Used to get 32mph. Now only 20 and it struggles to get there. 130psi in both cylinders. Less than 3% leak down in each cylinder. New Carson Reed valves All...
  3. J

    88 Johnson 40 Tiller linkage

    Manual says to ”Turn the twist grip to full open and to full closed positions. Check the clearance between the roller and end of cam slot. The roller should be approximately 1/4” away from both ends of slot.” For the life of me I cannot accomplish this. I “loosen jam nut and rotate thumb...
  4. J

    1988 Johnson 40 lower crankshaft seal

    Motor bogs down at WOT. Struggles to get to top speed of 20mph (was 9mph until I found bad reeds and put a new set on). Both cylinders get 130psi Motor overheated last summer due to head gasket failure and a piece fell and blocked the cooling water. Motor has all new ignition components...
  5. J

    1988 Johnson 40 stator question:

    Motor: 1988 Johnson 40 J40TELCCS Question: Once the flywheel is pulled what all should I go ahead and replace while I’m in there? Reason/backstory: 2020 - Bought the boat and motor. Rebuilt fuel pump, carbs, new fuel line and bulb (not the gray line), water pump, etc. Ran great 2021 -...
  6. J

    1988 Johnson 40hp Tiller throttle linkage

    I’ve got the Service Manual and I’m using it to get everything lined out and adjusted, but I’m having a tedious time with step 4 and 5 which state (page 1-36): 4 ”Turn the twist grip to full open and to full closed positions. Check the clearance between the roller and end of the cam slot. The...
  7. J

    Joe Reeves Timing Question/issue

    1988 Johnson 40hp (J40TELCCS) Tiller What I did before timing procedure: - Adjust throttle linkages as described in the service manual for my motor. I saved timing for last since the manual says to do things in the order presented. At the end everything looked as it was supposed to in the...
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