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  1. C

    Need some help fellas !!

    Fuel is premix 50::1 gasoline/oil. A motor that old probably doesn't have an oil injections system, so fuel must be mixed. After you replace waterpump impeller, replace the gear oil, and grease the fittings for tilt and steering. Use a flush device when you start it.
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    bilge problem

    Gee, Bondo. I run one of those pumps in each of my boats. I never had a dead battery. I think they work real well. I have run pumps with separate float switches. They get a piece of jetsam under the float and run the battery dead. The pumps with built in floats are nice, but the float...
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    Best type of fuel tank for gas engines?

    Fiberglass and gasoline/alcohol are not well suited. The fiberglass can dissolve in alcohol. SS will bust the budget. Aluminum will hold up for 25 years in salt water, longer in fresh. Plastic is forever. Steel tanks are good, but susceptible to rust.
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    Clicking tilt trim and now blowing fuse ? 50 Mercury 2 stroke

    I am pretty sure that a '91 would originally have a 3 wire PTT motor and solenoids. Jumper the PTT motor directly from the battery and see if she turns. If so your wiring or relays/solenoids are suspect. If the motor has a black, third wire, make sure that is grounded well, prior to...
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    Cable and Drum steering

    Your hydraulic steering should have a spec for turns lock to lock. See if you have the same. Low fluid or defective components could cause more turns in your hydraulic steering. Next check the lock to lock spec for a single cable steering system. If your hydraulic system is working properly...
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    Fuel capacity

    Expect it to be about 35 Gal. That was pretty typical for boats of that size, in that year. It could be a bit less as well. It makes sense to look at the condition of the fuel tank as well. It is likely aluminum, and if you boat in salt water, it could be near end of life.
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    1998 Johnson 150 lower mount cover

    Gee, I agree with rothfm. Pull the cover as best as you can. Midsections are hardly ever damaged, so salvage yards are full of them. See if you can fix yours. Broken bolts in the cover or steering arm cover can be removed using a pipe wrench. Drilling SS bolts is a problem.
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    8-pin cable plug harness

    New controls and boat wiring harnesses are not all that expensive, say < $150. Since they are new the wiring to the round plug is molded and waterproof, better that what you can do with a new plug (if you can find one), solder and shrink tube. You might be able to find just a new wiring...
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    High idle after changing carb bowls J150VXSIG

    Check to see that the throttle is closing on the 2nd motor. On a motor similar to yours, I had the throttle linkage hang up once, for no reason I could find. I pushed it closed and it was fine since. just a SWAG.
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    Possible lower unit damage?

    You might check out SEI. They make new gearcases for a few more $ than a used one. When you resealed your gearcase did you not replace the propshaft seal? That could be leaking. Also, 20PSI is pretty high. Does she leak at 5 PSI?
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    Possible lower unit damage?

    Drain it and pressure test it. That is the only way to know for sure. Put a bicycle pump onto your gear oil pump fitting and give it a few pumps. Leaking should be obvious
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    Uprgrading outboard

    Looks to be standard rotary cable steering. It should swap over. Control looks to be standard as well. If the electronics are plug and play, you should be good to go.
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    Hose connection in transom well?

    Likely for raw water washdown. Look for a thru hull fitting which would route the water to the pump.
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    Parts availiability ??

    Your rant is an old wives' tale. Champion Spark Plugs were and are good spark plugs. They have been a leading brand forever. The 50's and newer Johnnyrudes specified them 70's and later Mercs specified them as well. even today, as such, Johnnyrude owners swear by them. I have found no...
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    Trim tab removal on a 1970s(?) Merc 500 Thunderbolt 50hp

    Crap, the zinc is much softer. Destroy the zinc anode and replace the bolt. Drill a few holes in the zinc and break it off with a chistle. Older Mercs often had hex head bolts there. Sometimes you needed a specific thin wall 3/8" drive socket to get to 'em. The right size socket would just...
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    Parts availiability ??

    The Champion L-78V was the original plug specified by mercury in the early 70s (or earlier) for some of their IL engines. It was superseded by the BUHW-2. The L-78V still looks to be available. You could also likely use the Champion L-76V, as it is real close to the BUHW-2. There was also a...
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    1986 115hp inline 6

    The carbs can have unique idle mixture settings. usually, the top carb is the most open, followed by the mid carb. However, you need to use trial and error (and a friend is nice), to set them properly.
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    1986 115hp inline 6

    Unlikely your issue is reed valves. Your carbs are all cleaned and rebuilt with new gaskets, inlet needles, seats and floats? Your ign timing is spot on? You are adjusting the carbs in the water, in gear with fresh 50::1 fuel mix? Those things are necessary. A leaking fuel pump diaphragm...
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    Throttle shaft

    Once you synch the carb opening and ign timing, set the idle speed to whatever runs slow and smooth.
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    Universal control cable

    See what control cables Yamaha recommends for your model of motor. Merc and Johnnyrude are quite different, I would therefore expect Yammies to have their own. Heck, even their gearcase plugs are different than merc and Johnnyrude.
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