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  1. S

    92 Johnson 55 Lower Carb Bowl Fuel Nipple Connects to?

    Thanks. Ill take a plug off the 50 carbs then.
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    92 Johnson 55 Lower Carb Bowl Fuel Nipple Connects to?

    Upgrading a 91 Johnson J50JEIA 50hp to 92 E55RWLENM 55hp carbs. The old 50hp bowls are plugged. The new lower carb has an extra fuel nipple (#22) facing the air box (it clears below). What is this supposed to connect to?
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    1975 Johnson 50 hp upgrade to higher horsepower

    Did you end up doing anything? I am contemplating the same thing on a 91 Johnson 50.
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    Will Replacing Rings Increase Compression >105PSI?

    I’ve never heard of this. Wouldn’t this significantly reduce compression? What should be expected?
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    Will Replacing Rings Increase Compression >105PSI?

    Engine runs really well but is slightly underpowered. Gage is definitely accurate!
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    Will Replacing Rings Increase Compression >105PSI?

    My 91 Johnson 50 two cylinder is running 105PSI in both cylinders. It looks like other Johnson 2 stroke 50s from the 1980s to 2000s on this forum are running as high as 140-150psi. In the past I’ve increased compression of 2 stroke small engines by replacing rings only, but I’ve never worked...
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    91 Johnson 50 Hesitates w Reduced WOT RPMs

    105psi both cylinders after 2 tests after running the river. Plugs looked really good when I pulled them. Several times the rpm’s jumped from 4600 to 4800. Once it almost died and came back as the boat slowed down.
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    91 Johnson 50 Hesitates w Reduced WOT RPMs

    I’ll try both of those. Hopefully I can do it tomorrow with my daughters while I’m on dad duty!
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    91 Johnson 50 Hesitates w Reduced WOT RPMs

    I have a 91 Johnson 50 with a jet on a 14’ boat. It used to run about 4900 RPM at WOT and was smooth the whole way from idle. A few days ago we were running and on one launch it capped out at 4600 RPM. It would run smooth to 4500 RPM and as soon as pushed the throttle just a tad further to WOT...
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    Johnson 50/35 Jet 5000 RPM at WOT

    That’s a good idea. I’ll see if I can borrow one to test mine. I think the thermostat is also acting a bit stuck which may have contributed to the engine running cold. What should be the difference in psi on a hot and cold engine?
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    Johnson 50/35 Jet 5000 RPM at WOT

    Tested tonight. Started up and idled with foot in a 20 gallon bucket with water running until the head didn’t get any warmer. Head never got super warm so I’m not sure if the test was good enough. 85psi both cylinders tested twice. Pressures didn’t spike on starting and didn’t bleed off so i am...
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    Johnson 50/35 Jet 5000 RPM at WOT

    I have a 91 Johnson 50/35 on a 14’ river runner. It takes longer to get on a plane than I would like. At WOT it runs 5000 rpm whether accelerating or on a full plane. The throttle stop is set so the intake is wide open. I think the holeshot would be faster if I could get rpm’s up to 5300-5500...
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    Convert Jet Non-Flanged Liner to Flanged Liner

    Looks like some of the pics didn’t post…here they are!
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    Convert Jet Non-Flanged Liner to Flanged Liner

    I have a 91 Johnson J50JEIA with model AF jet. The jet has a non-flanged liner. Ordered a new liner from outboard jets and I can’t get it to seat far enough to insert bolts no matter how hard I hit with a mallet. It’s 1/16” to 1/8” off. The hole seems to be in a slightly different spot too...
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    1995 Johnson 40 HP J40TLEOD control box tilt and trim

    The relays / harness are supposed to come with a tilt trim unit next week. Is there a special connector to wire into the harness? Hoping to get everything on order so that I can install in one shot and use next weekend!
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    1995 Johnson 40 HP J40TLEOD control box tilt and trim

    I am adding this system and sourcing parts so I don’t have any open plugs to at the control box or the engine that I can find. It’s hard to follow where the connection points are and what they are in the thread because everyone else has a frame of reference since they have a system to start...
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    1995 Johnson 40 HP J40TLEOD control box tilt and trim

    I’d like to tap the knowledge of this thread. I am adding power tilt trim to my 91 Johnson J50JEI. I am ordering all of the parts right now. Below is a picture of the handle cover and wiring I’ll buy, a diagram, and my control box. What does connector 71/72 plug into? Plus this is my first...
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