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    Yamaha F20 no spark.

    So the charge coil would be the generator under the flywheel I m guessing?
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    Yamaha F20 no spark.

    Don't know.im at a distinct disadvantage having no manual. I'm thinking the CDI gets its input from the pulser coil? So it could be a weak pulser coil maybe. The one on the 8 hp looks similar enough maybe I should give that a shot. I swapped the main coils with no joy. Interestingly even with a...
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    Yamaha F20 no spark.

    2014 f20 yamaha. Spark very weak,you can feel it and a faint spark will jump from a screwdriver in sparkplug lead,to ground,but it won't jump the plug gap. Checked temp sender and lanyard switch both ok.I have an 8 hp that has I blvd a similar coil so am going to swap but I doubt it's that...
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    2014 20 hp overheat sensor?

    Sorry ,I omitted the Yamaha from heading somehow. It's a f20 Yamaha tiller model no alternator or starter.
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    2014 20 hp overheat sensor?

    No horn on a 20 that I know of.
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    2014 20 hp overheat sensor?

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    2014 20 hp overheat sensor?

    Nope there something that makes the engine rapid miss ie shudder to alert operator to issue. For sure this happens when engine overheats but it also happens ,like today,when I tried to start it cold while in a weed soup. It started but immediately went to shudder mode.no time to overheat.
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    2014 20 hp overheat sensor?

    2014 20 HP Yamaha.
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    2014 20 hp overheat sensor?

    My 20 hp is very sensitive to weed around water pump pickup. Starts shuddering immediatly on contacting kelp. No complaint there but Id like to know how it does this. Theres no time for engine to overheat it seems,so there must be a water flow sensor Im thinking. dealer says no but Im not convinced.
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    Whirring sound at low rpm from Alpha gen 2 on 5.0 carbed mercruiser.

    This is driving me a bit bananas.Distinct whirring sound from drive at say under 1200 rpm. In gear or out. No metal on drive magnetic plugs. No excessive gear noise at cruise ie when you lean over transom and listen. Steering side to side makes no difference. Take drive off and run engine theres...
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    What coil to use with tbolt 5 ignition on 2001 5.0 mercruiser

    Confused. Need a coil for my 2001 mc. Seems it should be pretty generic but maybe not. Its a mc part 392 8M0079202 regular round shaped coil. No idea if its ext or int resistor. Crossover seems to be a Sierra 18-5438.Updated mc number seems to be 300 8M0078202 maybe. This is where it gets...
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    Alpha Gen 2 upper gearcase rebuild,5.0 litre,1.62 ratio.

    I recently had a tooth come off one of the upper gears in the Alpha G2 drive. I noticed a slight change in vibes I guess right when it happened,not far from home dock. I pulled drive and found upper gears bad. Interestingly to me at least,no metal got into lower drive. I suppose because i got on...
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    Sideways alignment question 2002 5.0 MC

    I reinstalled my 5.0 yesterday,didnt mess with original alignment as alignment bar always slid in fine before. Still goes in fine. Thought Id slide in my 1 inch bar(never tried on this boat before) and see how it centred in the gimbal bearing. It is noticeably off to one side. Maybe 1/4 inch or...
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    115 suzuki prop shaft runout

    Helping neighbour who has a 115 Suz. Prop shaft runout measured at end of shaft(turning shaft) is 25 thou. What is allowable tolerance and where is one supposed to measure this?He backed down ramp with motor down,wrecked prop in process,even broke skeg off. Put a new prop on and he says it runs...
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    Alpha g2 zinc on bearing carrier,mercathode?

    Just realized a G2 drive has a zinc on bearing carrier in behind prop. Mine's gone of course,Merc dealer says he never gets requests for them. What is the deal? Do most people use them or not? Cant see evidence of corrosion in that area. Also, thinking of getting a Mercathode system.Anyone have...
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    Electric fuel pump info in merc manual

    Where does one find fuel pump info in a Merc manual? I have a 2001 5.0 carbed,recently aquired Merc manual(s) #31 for this unit. Am troubleshooting a fuel issue and would like to see what they say abt the elec fuel pump. Havent found a thing. Where do I look? Thx T1
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    diesel on alpha gen2?

    Reading the comments re "im on a boat"s ideas on a large gas engine on Alpha drive,Im wondering if the same "take er easy" principles would apply with a diesel . The torque values on several adaptable diesels in the 200 hp range are in the mid 300's similar to a 5.7 sbc etc,is this the guideline...
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    alpha gen 2 trim tab

    My Alpha gen 2 seems to not want to accept a trim tab the standard mc triangular tab either touches the prop(14.5x18 4 bl) or just clears(15x17 3 bl) I need a tab to compensate for torque now that Ive dumped my power steering,cant figure out what Im doing wrong. As well, with the tab cranked...
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    anybody else paint their outdrive?

    19 years ago I painted my alpha drive,trim tabs,aluminum swim grid braces etc.,along with underwater portion of f/g hull.Used interlux f/g bottomkote.Didnt know any better,seemed like a good idea at the time. Boat was in saltwater all year round,every year, except for twice annual...
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    Gen+ Mercruiser?

    What does it mean when a parts listing ie carb says it is good for 1997 and later Gen + Mercruiser engines(5.0 litre in this case) http://www.sterndrives.com/carb_chart.html
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