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    How to sync carbs on Merc 150 2 stroke

    Does anyone have experience syncing carbs on a Merc 150 2 stroke? In the manual it says to go 1 1/4 or 1 1/2 turns on the idle screw (can't remember which) on each carb, but I have also heard that you need to use a carb sync tuner like this to get them all working together correctly...
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    One engine getting bad gas, both pulling from the same tank...also a fuel leak?!?

    Noticed that one of the engines in my twin outboard setup is getting murky gas after the engine just cut out suddenly. I emptied the fuel water separator and replaced with fresh gas. It ran fine for a few minutes and then stopped running again because of bad gas I'm assuming...? The gas looked...
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    Rough number of hours to rebuild 150XL 2-stroke?

    I may have to have my 1998 Merc 150 XL OS 2-Stroke (carbureted) outboard rebuilt and am curious if anyone has a rough estimate of how many hours, or how much $ it would cost. I know it depends on what is actually wrong with it, but assuming there is no cracked block or heads, does anyone have an...
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    Depth sounder on Garmin GPS Map 4008 not working

    Hello, I recently bought a boat with a Garmin GPS Chartplotter. It has the depthsounder, fishfinder and fish-eye view functions. The depthsounder is currently not working. I did an update so the software should be good. Does anyone know any recources for troubleshooting and fixing this issue...
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    HELP! Engine seized!

    So I bought a boat that was sitting for 5 plus years. Twin Merc 1998 150 XL OS 2 strokes. I was told both had a rebuild with new power heads about 7 years ago (then sat for 5 years), one has 80 hrs and one has 67 hours since rebuild (per timers on instrument panel). Did a spring/100hr tune up...
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    New Thermostats are leaking out of the housings..

    Now I have to figure out how to stop my new t-stats from leaking out of the housings (2 out of 4 are leaking) on my 1998 150XL Merc outboards. The gaskets seem to be a compression type where the outside of the gasket expands as pressure is applied. Unfortunately it seems to be a manufacturer...
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    Neutral throttle button won't engage on Quicksilver dual engine throttle control!!!

    Port side neutral throttle button won't engage on my Quicksilver throttle control. Starboard side works fine. It worked just a few weeks ago. Took the cover off and looked inside. Sprayed PB blaster, then Corrosion X inside hoping it would free things up and help the operation in general (boat...
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    Can't get the lower unit back on...HELP!

    So water pump was rebuilt, now trying to put the lower unit back on my Merc 150XL OS 2-stroke. CAN'T GET the shift shaft splines to go correctly into the housing. Not talking about the driveshaft FYI. Driveshaft goes in fine (as I turn the prop a bit), but I can not get the shift shaft in. I...
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    Tap for 3/8" bolt, or use helicoil in existing 5/16" hole for t-stat cover in head?!?

    Tap for 3/8" bolt, or use helicoil in existing 5/16" hole for t-stat cover in head?!? So I just found out one of the threads that holds the two bolts for the thermostat cover is stripped. Do I have enough meat around it to tap a hole for a new 3/8" bolt, or will I be too close to going through...
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    Do impeller fins go opposite direction on counter rotation outboard? (150 CXL)

    I made the mistake of taking the impeller off of the shaft before checking to see which way the fins were pointed while rebuilding the water pump on the 1998 150 CXL engine I have. Does anyone know if the impeller rotates in the opposite direction on a counter rotation merc?
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    Torque specs for spark plugs on a 1998 Mercury 150XL 2 stroke

    Does anyone know the correct torque for spark plugs on this engine? I am assuming there is a specific torque...? I can't find it anywhere in the service manual. Thanks
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    Change 2-cycle oil in remote tank?

    Hello, I have recently purchased a boat with twin 1998 Mercury 150 XL 2 stroke engines. It was well maintained, including complete rebuild with new powerheads before it was stored for the past 5 years. Unfortunately I don't know what was done previous to storage (winterization, etc.), so I am...
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