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    Does this sound like a bad head gasket?

    Back when I ran the boat for several weekends then all four plugs, especially the two bottom ones would look fouled to me, this test took 20 minutes with four brand new plugs, I trolled out from the boat landing, opened her up, ran across the bay turned around and went back. Three plugs still...
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    Does this sound like a bad head gasket?

    I'm having issues with my 1994 Yamaha 130hp two stoke, Today I put in four brand new spark plugs and went for a ride, for about 5 seconds it ran at "full power" then dropped down to 4,000 rpms. Ran back to the dock and the #2 cylinder spark plug was black, the other three looked good. Does this...
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    Yamaha 130hp fouling plugs

    thermostats checked out "ok", I'm considering trying a slightly warmer spark plug. I'm currently using NGK BR9HS-10, I'm going to try BRHS8-10.
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    Yamaha 130hp fouling plugs

    it's moving freely back and forth as it should...
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    Yamaha 130hp fouling plugs

    Got a 1994 Yamaha 130hp 2-stroke, it keeps fouling up the plugs... I checked the compression and it's 130,130,130, 127. Ran across the lake today wide open and stopped at the dock and checked the temp with a laser thermometer, the highest temp on the top of the block was 110 degrees. the water...
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    Can a 1984 Evinrude 6hp be upgraded to an 8hp?

    Does anyone know if a 6hp can be easily converted to a 8hp? I have a 1984 6hp E6RCRM.
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    1967 Johnson 9-1/2 idling issue

    my 1967 Johnson 9-1/2 starts and runs great except when I turn it down as slow as it will go, she will idle very slow for 30 seconds or so than speed up on its own for 10-15 seconds then slow back down again. Fuel pump? carb float? any ideas?
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    Spark plug crossover question

    I have a 1994 130hp Yamaha, the plugs that came in it were NGK BR9HS-10, the auto parts store didn't have them and told me Champion QL77JC4 came up as a equal replacement. Is this true? If not what over plug can be used?
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    Did leakdown test, will a new head gasket help?

    Ten years ago I got a used 1994 yamaha 130 2-stroke. I did a leakdown test today and the two cylinders on the left side tested good 5-6psi leakage, the two on the right are at 10psi. Would replacing the head gasket help?
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    Converting 2.4 Merc EFI to 200 carbs

    changing a 200 efi to carbs, which air vent jet should I use, two are listed .084 or .096? it will be used in Minnesota.
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    Cold compression test question

    I'm looking at a 1986 Mercury XR2.
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    Cold compression test question

    will a compression test on a cold outboard be as accurate as one done on a motor thats been warmed up?
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    Does compression determine horsepower???

    I purchased a 1994 Yamaha 130 for my bass boat. It runs great. I got a Yamaha service manual for it and the specs show that a 130 should have between 134psi and 164psi. I had a compression test done on it before I bought it and it was 125, 129, 130,134. Will this motor be able to produce 130...
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    Merc 150 efi rev limiter

    Anyone know what the rev limiter is set at on the ecu from an early 1990's 150hp? part no. 824003 A10. thanks, Don
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    Prop for old Merc

    South Haven, MN
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    Prop for old Merc

    Does anyone know if anyone still sells props for old Mercs? I need one for a 1972 merc 50hp. 11 splines, an 11" or 12" pitch will work. The part number on the old prop is 48-32186A1-12.
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    1983 235hp Evinrude repower pros and cons...

    Looking to repower my 18' V-King, found a 1983 235hp Evinrude that has a rebuilt powerhead. What are the pros and cons someone can expect from this model? Did it really produce two hundred and thirty-five horse power?
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    1985 Mercury 90hp in-line six compression

    A friend got a 1985 Mercury in-line 6. I tested the compression for him and was surprised that all six cylinders were over 150lbs. Is this normal for these old tower of powers? It doesn't look like its been cracked open and rebuilt.
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    1988 Merc 220 xri...maybe a dumb fuel injector question?

    Are they difficult to replace? I found a different v-6 efi from the same year range that had an oil injection failure, but has 6 "good" fuel injectors?
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    1988 Merc 220 xri...maybe a dumb fuel injector question?

    Got a 1988 Merc 220 xri thats running like its a 5 cylinder instead of a six. Spark is good but I think the #6 cylinder isn't getting fuel? Is this possible on a efi? Does each injector feed each cylinder? This will be my first time working on an efi so I'm alittle green...
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