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    surging 40hp yamaha

    I've got a 3cyl yamaha 40hp that surges a little bit ONLY at WOT. It feels like its leaning out and picking up the RPMs a bit when running at constant WOT. This results in a mildly annoying jerking at full throttle. <br /><br />I have disassembled the carbs and cleaned a stuck float this past...
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    Jet Drive question

    Any of you guys with a yamaha jet drive outboard can answer this for me.<br /><br />How much can you throttle up in reverse? How much more than idle? <br /><br />My prop outboard doesn't go past idle in reverse and I need a little more power to get off the trailer. I was thinking of swapping...
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    looking for more reverse RPM

    I've got a 1988 40hp yamaha with remote controls. I need a little more RPM in reverse to get off my trailer bunks.<br /><br />I noticed that yamaha makes two different throttle cams for this engine. One appears to be for the alaska version (part number 6H4-41213-E1-00 CAM, ACCEL). Does...
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    1 super clean plug

    I've got a 1989, 3 cyl, oil injected, 40hp yamaha. It runs just perfect. I was going to change the plugs when I noticed number 3 (the bottom plug) was as clean as a whistle. The other 2 look like they had been used normally, perhaps a little on the oily side. <br /><br />I was thinking bad...
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    boat twists to left

    I just installed a teleflex rotary no feedback steering system on my boat. Everything is great but at top speed the boat twists to the left. It doesn't really turn to the left, but the port freeboard is less than the starboard at the upper rpms. It didn't do this before with the old rope and...
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    are steering arms the same?

    Are steering arms all the same? I need one to connect my 40 hp yamaha to the steering cable in the tilt tube. The yamaha part is pretty pricey. A friend of mine has an arm for a Johnson which he was using on a mercury. He doesn't need it any more, will it fit on my yamaha? If it makes a...
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    shift adjustment

    I recently changed the impeller on my '89 40hp yamaha. I didn't keep track of the number of turns on my shift linkage when I took it apart. Right now it goes into forward fine and makes a little crunching noise as it goes into reverse. Which way do I need to adjust the turnbuckle on the shift...
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    how to find prop pitch?

    I recently put a used yamaha 40 on my boat. I'm just barely in the RPM operating range with a normal load. I'm at 4600 and the operating range is 4500-5500. I'd like to drop the pitch a bit, but I need to know what pitch the current prop is. Are the prop dimensions written on the prop...
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    McCarthy Boats, Riverside, NJ

    Does anyone have any information about McCarthy Boats of Riverside, New Jersey? I own a wooden runabout made by them in 1958. It is a 14 foot Sea Mac, outboard powered. It is a gorgeous boat that I still enjoy and was looking for more information about. Anyone know where I can look? :cool:
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    synthetic for oil injection?

    I am thinking about using pennzoil full synthetic in my '89 yamaha 40 with oil injection. I've heard some people say that synthetics aren't good for oil injection pumps? Is there any truth to that? What about synthetic blends? Pennzoil says <br />its okay and some manufactures make...
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    tachometer for pull start

    I have a 1989 40 hp manual start yamaha. How do I connect a tachometer to it? It did have a tach connected at one point. The dealer installed a harness consisting of 1 green and 1 black wire which connect to something under the flywheel (lighting coil perhaps???). My question is what kind of...
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    Small boating in florida keys

    I am planning a trip to the keys and would like to do be on the water with my 15 foot runabout. What are some areas calm enough for my boat and nearby boat launches?<br /> :confused:
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