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  1. H. I. McDunnough

    Yamaha/Mariner prop fitment

    I recently spun the prop on my 1979 Mariner 40B outboard, and am currently shopping for a new one. It was a Black Max (extra surface area) 10 1/2 x 13P. It worked perfectly for my rig ; I got 29 mph at a max rpm of 5500. My spare is a Vengeance 10 1/8 x 14P, which I am currently using. It runs...
  2. H. I. McDunnough

    Flywheel rubbing on recoil starter

    Yesterday I heard a ticking sound coming from under the recoil starter on my 1979 Mariner 40 hp motor. I removed it and found that the recoil starter had been rubbing on the flywheel. it looks like it took quite a bit of material off, as well as, melting the pawl in place. I did have the...
  3. H. I. McDunnough

    Magneto Breaker Points

    After dewinterizing and warming up my 1978 Mariner 40B (started right up), I gave it a little gas. It started getting some smoke. I gave it a little more and it cleared out. It did this last year, so I moved up to the next hotter plug. It helped a little. I pulled the plugs. Sure enough, they...
  4. H. I. McDunnough

    Power Drive steers slowly

    I have a 55PD that's 12yrs. old. It steers slowly, now, especially at higher speeds. I've gotten in the habit of reaching down and grabbing the head to give it a little assist at those times. Any way, the out side of the coil cord is all cracked-up and coming off, so I tore down the whole motor...
  5. H. I. McDunnough

    Magneto Timing?

    My question is, "Where do I set my timing at?" My motor is a '78 40B Mariner. It has a magneto ignition. I did enough research to finally figure out how to set timing on a magneto. I got the proper tools and set it according to the manuals specs. Well, sort of, the manual called for a dail...
  6. H. I. McDunnough

    Has anyone had this happen before?

    Has anyone had this happen before? I was gone for a week. When I came home, there was a small spot of gear lube on the concrete below my outboard. I traced the oil up the back of the skeg to between the gear housing and the prop. The gear oil was just like it came out of the tube; no water had...
  7. H. I. McDunnough

    Best fuel lines?

    Alright, I'm done with fittings! I got rid of the fuel fittings at the motor and replaced the fittings at the tank. It worked for a while, but today I had trouble at the fitting end. I had another fitting on board. I cut it back, replaced it, and was on my way. I think I can relpace that with a...
  8. H. I. McDunnough

    Where do you get power for magneto powered hour meter?

    Now that I've rebuilt my motor, I'd like to install an hour meter. I'd like to do a tidy little install in the lower cowl or on the motor itself. I don't wan't to use the ignition (run) wire. I've found some small meters that run on magneto power. Would that come off the primary ignition wire or...
  9. H. I. McDunnough

    Pistons for Yami built Mariner

    I'm looking for a .030 (.75mm) over piston kit for a 1978 Yami built Mariner 40B. I,ve found some Yamaha kits that are the same size. Can anyone tell me if they will work? The numbers are 6H4-11636-00-00 and the other is from the same chain of numbers (6H4-11631-09-96), simply marked 100-260-06...
  10. H. I. McDunnough

    mariner piston kit

    I'm looking for a .030 (.75mm) over piston kit for my 1978 Mariner 40B. I've found some Yamaha kits that are the right size, but are they the same? Will they work? The numbers are 6H4-11636-00-00 for a .50 over, and a .75 over that is the same kit but identified with 100-260-06. Thanks, Rick
  11. H. I. McDunnough

    Mariner 40B (676) carburetor fix? Tell me what you think

    I've been working on a 1978 Mariner 40B for the past two seasons now. I could never seem to get it to idle smoothly. It would always climb and drop-off at idle and at low rpms. My mind kept going back to when I rebuilt the carburetor. I couldn't get the float level right. There are three...
  12. H. I. McDunnough

    Which fuel tank? 1978 40 hp

    I'm running a 1978 40hp Yami/Mariner on my old (2001) Johnson tank and connector with a 3/8" fuel line ass'y. I've been having trouble with leaks, and I want to replace the whloe system. I want to get the fuel delivery right, but I can't get the right stuff. I can get the fuel line ass'y and the...
  13. H. I. McDunnough

    bottom cowl cover 1978 yami mariner

    I'm looking at buying a bottom cowl (shaft) cover for my 1978 yami mariner. I'm assuming that it is to dampen sound, which would be nice for tiller operation. If so, dose it work and is it worth the investment? Thanks, Rick
  14. H. I. McDunnough

    Bulb goes soft

    My primer bulb will pump up and get hard. As soon as the motor starts running it goes soft. It will also go soft if it sits after being pumped. I have rebuilt the carb; including replacing the jets. I have also rebuilt the fuel pump. I am about to buy a new fuel line assembly, a new tank...
  15. H. I. McDunnough

    Mariner powerhead swap?1978 40 hp

    Are the power heads for a 1978 and a 1986 Mariner 40hp interchangable? Does anyone out there know? I know they are different part numbers, but it looks like everything will bolt-up the same. The only things I see that are different are the '86 looks like it has a soft plug and it also has a...
  16. H. I. McDunnough

    Mariner 40B power head job, 1978 Mariner 40BE 676

    I have a 1978 Mariner 40BE 676 that I am trying to put in service. When I first bought it, I had a mechanic look it over. He said it had good compression, but that the plugs were wet. He put new head and cover gaskets on it. I later noticed that they were wet again. He replaced them again, and...
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