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    Props for Yamaha F100 and 17 Boston Whaler

    Engine is 2000 yamaha F100. Boat is 17 boston whaler montauk classic. Current prop is 17 P aluminum. Engine is installed 2 holes up, full RPM is 5600-5700. The manual says it should reach 5600-6000. Top speed is 37 mph. My question is, what option is better for me? 1. Lift engine and install...
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    2000 Yamaha F100 four stroke oil alarm goes off at first and then goes away

    My engine is 2000 Yamaha F100 which is running very good. The oil alarm goes off immediately upon starting the engine the first time on water. I stopped the engine, removed the filter, and attempted to clear every droplet before reinstalling it. After several cycles of turning the engine on and...
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    yamaha f100 low oil pressure alarm

    The oil pressure alarm problem happened before occasionally on the lake, when it run in high rpm for 3 mins. It did not trigger the alarm if it was running below 3000 rpms. I guess it was the fault oil pressure switch so I ordered the parts. Then I changed the remote control from 703 to 704 and...
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    Yamaha F100 seized

    The crank was seized and was believed to be the lower unit drive shaft and oil pump. It was running good in the fishing trip one day. When it was time to travel back, it got seized there. I have lifted the powerhead. I have tried to crank with a wrench but failed to rotate it. The oil pump and...
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    Yamaha 100 hp 2000s flywheel locked up

    I am going to buy this motor, 4 stroke. The owner says the flywheel locked up in a fishing trip because of the lower unit. The lower unit can not be taken off because the shaft locked into the powerhead. It said to be caused by the bushing, or the oil pump problem by a mechanic. How bad the...
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    1977 Mercury inline 1150 distributor trigger broken again

    I bought a CDI 3736 distributor just 2 years ago and passed the warranty now. It broken again. The switch + coil have been tested to spark good. The brown port of the switch is 12+ v when not connected with trigger; becoming 8.75 v when connected with trigger. This is exactly the same situation...
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    Any alters for coil 332-4895?

    This coil 332-4895 is for 1977 mercury inline 1150. I installed a brand new old stock 1 year before and failed now. I don't want an old stock or used one any more. What alters can I use? I have tried several auto coils but doesn't spark so I must need some specific ones. Edit: pretty sure the...
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    1991 Force 90hp starting problem

    These days I am working on my back up engine. 1991 Force 90 HP, 3 cylinder The top piston position is at 0 deg correct. The full throttle is set at 28 deg with help of timing light. The idle mixture is set 1 1/4 turn from touch position. Idle speed is set as the mark is right below the touch...
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    bouncing Tac at idle

    TAC works very good above around 1500 rpm. Very solid and stable, calibrated by signal generator. However, when at idle, it bounces around 800-1000 rpm, not abrupt type but not stable. I was using my multimeter to check the signal too and found the same problem. At idle speed, it reads random...
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    Mercury inline primary pick up 4-6, which is better, 4 or 6?

    My motor is 1977 mercury 1150, serving me well, except it has to be set around 1000 rpm not engaged on idle to not bog down. If setting at 800 rpm idle non-engaged, it has 10% to bog down in some certain situation, such has rough water area. When engaged, it's always 650-700 rpm. I've read...
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    Mercury inline 6 distributer rewiring screw plug grease

    It's nothing wrong with the wiring, it's just too old for 40 years. So my question is the grease or whatever in the distributor cap hole where the spark wire crewed in. What is that? I guess its not dielectric grease. It maybe the regular grease to keep water out? It's pretty thick and sticky...
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    Propeller size for 1977 mercury 1150

    My boat is 1977 boston whaler montauk outboard: 1977 inline 6 1150 propeller: solas 13.25 x 17 RPM: 4600 Boat runs very good now, no issue so far. So I need to change 17 pitch to 15 pitch, which looks very low to me. Any comments please? Thanks.
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    When opening throttle, inline 6 speeds up for 20 s and then lose power

    Hi there, I am still on water, engine is 1977 inline 6 115. It starts and trolling idle very well. But whenever open throttle, it speeds up quickly for 20s and lose power. Everytime. I can idle back to ramp and occasionally on 2000s. Any hints what could be wrong?
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    Outboard stalls when put into forward after reverse first

    The engine is 1977 inline 1150. The idle speed is 900-1000 no gear, 650-700 in forward. The carburetor is set according to the guidelines in this forum, 1/2 then 1/4 back turn from bogging down. Idling, hole short are all good. Compression is all good. However, when I first put it into reverse...
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    Water intruding into cylinder

    Motor is 1977 Mercury 1150. The power head and exhaust baffle are taken out. There is water intruding. Just have to figure out where is the water coming from. 1. The power head is dissembled after running the motor for 15 minutes on muff. 2. On the power head seating plate, the bottom shaft cap...
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    sparking sound when idling

    Motor is 1977 mercury 1150 with distributor. Motor starts ok. Idles the same as before, a little rough as usual. It idles a little rough in water, but always runs good on WOT. But I want to give it a check why it idles rough. When it idles, I can hear the sparking sound. Since it is too noisy...
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    Grease in distributor cap

    The motor becomes very hard to start after sitting for 3 months. It dies at idle even it agrees to start. After a series of tests, I found out the sparks are on and off randomly. When I opened the distributor cap, found out a lot grease covering some of the pins. The grease can be seen even...
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    Mounting bolt template for 1977 mercury 1150 with tilt

    I have a 1977 mercury inline 6 1150 with power tilt. I am trying to install a manual lift jack box on my boat. But the old bolts pattern can not be found in any jack plate in market. I have now a CMC manual jack plate on hand. Does anyone have a boat pattern template or dimensions for that...
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    How to clean the non-skid deck? Stains and don't-know-what spills?

    Just trying to clean up a 1977 boston whaler 17 ft. The last owner has a lot spills over the back deck. And a lot stains here and there. The whole floor is covered with diamond shaped non-skid gelcoat. Some people say if the floor is ok, don't bother re-coating it. There must be a good way to...
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    1977 power tilt hose connection to cylinder leaking

    The leakage happens from the hose connection to cylinder, from both the bigger hose and smaller hose. There is no o-ring in there. The leakage comes from the threading. As I fasten it to far enough, it still leaks. My question is do I need an oring for this connection? I tried to search for it...
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