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  1. W

    Rattle that changes with RPM -Johnson 90hp

    The new upper crankshaft bearing changed the noise a little at mid RPM. It made the flywheel move less, especially in the forward-backward direction. So it probably was good to change it. I was at a loss as to what to do next so I took it in. The mechanic told me it is very likely a...
  2. W

    Rattle that changes with RPM -Johnson 90hp

    I meant crankshaft. I am going to install the new top bearing and see how it goes. If that doesn't fix it then I will take it in around October. The place I would take it estimated 6 to 8 hours labor to replace crankshaft. Crankshaft used is about $55 to $100. Then it is just a few normal...
  3. W

    Rattle that changes with RPM -Johnson 90hp

    Thanks for that info. Would love to upgrade, but have put too much time and $$$ in this motor (including boat itself and trailer) over past 5 years. Just not worth it now. But parts are getting hard to find. Would there be a knocking if camshaft itself was bad? Everything I have seen is...
  4. W

    Rattle that changes with RPM -Johnson 90hp

    Did you start to reply to this thread with good or bad intentions? You are now just being a smart@$$.
  5. W

    Rattle that changes with RPM -Johnson 90hp

    The assembly and bearing. Not entire crankshaft. Do you know what type of noise a bad upper crankshaft bearing would make? Groaning? Rattling? Does the flywheel movement in the prior video seem excessive? I found this thread, my problem seems similar...
  6. W

    Rattle that changes with RPM -Johnson 90hp

    In reading, a bad crankshaft Bearing can cause such a rattle, or delaminated magnets on flywheel (but this flywheel has integrated magnets. Flywheel has some play right to left, maybe 1mm. At least double that amount forward and back. I could replace the crankshaft assembly and bearing, but...
  7. W

    Rattle that changes with RPM -Johnson 90hp

    Wonder if bearing (3 or 11 in diagram below) maybe are bad? What type of noise would a bad bearing make? https://www.marineengine.com/parts/johnson-evinrude-parts.php?year=1985&hp=90&model=J90TLCOS&manufacturer=Johnson&section=CRANKSHAFT+%26amp%3B+PISTON
  8. W

    Rattle that changes with RPM -Johnson 90hp

    All compression 115 to 119 (got a new gauge). Gear oil isn't leaking and has about 2 to 3 hours on it since changed. Next step take off flywheel and look for problems? Are there bearings between flywheel and lower unit?
  9. W

    Rattle that changes with RPM -Johnson 90hp

    Reading a little more... could it be a flywheel with bad magnets? What am I looking for to determine if magnets are becoming delaminated?
  10. W

    Rattle that changes with RPM -Johnson 90hp

    Unfortunately it wasn't it. But I did appreciate the suggestion. It made the rattling/ticking noise right away in the water. It is more noticeable if you are going kind of slow then accelerate a little (louder during the acceleration phase). Took the cover (cowling) off in the water and it...
  11. W

    Rattle that changes with RPM -Johnson 90hp

    Thx. You mean a latch for the engine cover?
  12. W

    Rattle that changes with RPM -Johnson 90hp

    So I took it out last week and heard the rattle again. This time I even heard it slightly while at idle, but still is much more pronounced when in gear and louder as rpm increases. So I put it on the hose in the driveway again and it ran fine with and without the cover on. No rattle. I got a...
  13. W

    Rattle that changes with RPM -Johnson 90hp

    It is weird. I replaced the stator last Sept and tightened flywheel 100 ft lbs with my old harbor freight torque wrench. Took it out a week after the repair and ran great. I got a new Husky torque wrench over winter because the HF one started slipping last summer. This May I tightened the...
  14. W

    Rattle that changes with RPM -Johnson 90hp

    I think the gauge might be bad. Last year after I got it all compression were 115-120 range (I tested with engine cold and no throttle, but those don'tseem to matter much). It could have gone bad sitting in the garage over winter. But they are still all close and, as of now running on the...
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    Rattle that changes with RPM -Johnson 90hp

    Ok so this is what I did. First, I took off and put back on the flywheel. I did this first since the only change from last fall when it ran great last time out to this summer is I slightly tightened the flywheel nut in spring. Tightened the nut to 100-101 ft lbs this time. Looked on my OMC...
  16. W

    Rattle that changes with RPM -Johnson 90hp

    Took boat out for first time this year. 1985 Johnson 90hp v4. Faint rattle or tapping sound that gets faster but not really louder with increasing RPM. Not present at idle. Motor runs fine except for this rattle. It seems like more of a plastic sound vs a metal sound. Toward end of last...
  17. W

    1985 Johnson 90hp tach problem

    Motor is a 1985 model year 90 hp v4 Johnson two stroke. Took boat out today and when it was idling and when I was going very slow after putting it the water the tach worked. After leaving the dock starting to accelerate it dropped to zero. Speed was about 5 mph. As I sped up more to 10-15...
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    How to test stator?

    Took the boat out today for the first time this year. It is a 1986 model year 90 hp v4 Johnson two stroke. After driving a few minutes I saw the tachometer wasn't working. We continued for a few more minutes, then I slowed down and once it was in neutral before shutting the motor off the...
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    Losing fluid

    1986 Johnson 90 hp. I was having a problem with trim/tilt. I think I got that fixed, but in the process released the screw to manually raise and lower the motor. Now the screw (inside the hole where you can see a bit of fluid coming out) won't tighten. I can't get it out, either. It is...
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    What type of gas to use?

    I can get no ethanol 88 octane gas from Fleet Farm. Is it suitable for a 1985 Johnson 90 HP V4 outboard? Or should I stick with 91 octane no ethanol? There is about a 30 cent per gallon difference, which is pretty big considering the main lake I go on is large and I use about 3 gallons each...
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