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  1. wynjim55

    Can I DIY a leak down tester

    Back again, with my 1980ish Mariner 55 2 cylinder (Yamaha). I have been told a couple of times from different sources that my crankshaft seals need replacing. Is there anything to be gained from a leak down test? I have no reason to doubt what I am told, this is an old outboard that gives me...
  2. wynjim55

    Dual diagnosis - allergies and anxiety

    Today I took my boat to the main public boat ramp nearby to test if it would run or even idle, should have stayed in bed. The outboard is a 1975-78 Mariner 55hp (Japanese built Yamaha copy 2 cyl 2 carbs). On the trailer the outboard fired up and idled like a champion. After letting it warm up I...
  3. wynjim55

    Tachometer connection

    Where do I connect a tachometer to a 2 cylinder Mariner 55hp (Japanese built). The manual says to the two green wires from the stator. One goes to the termination block, the other has a connector mid way to the rectifier. Can I just disconnect the rectifier here and hook in the tacho? Should I...
  4. wynjim55

    Home made carb synch gauge

    Following the general instructions on youtube I knocked together a home made carb synch gauge (manometer perhaps - two plastic bottles with two stroke oil to less than half full, connected by plastic tubing and fitted with two vacuum lines that connect to carb vacuum ports). Are these ok to use...
  5. wynjim55

    Fuel line questions

    I have a 2 cylinder Mariner 55hp (Japanese Mariner) and I'm concerned about the fuel line I installed since rebuilding the carbs. I have a 3/8" (10mm) fuel hose from the tank through the primer bulb to the outboard connector, then I have 3/16" (4.6mm) hose from the connector through the...
  6. wynjim55

    2 cylinder Mariner 55 won't idle but runs like a train

    I'm sure others will know where to start diagnosing this problem, you guys seem to know it all collectively. In the driveway with the hose attached my outboard runs and idles just nice, put it in proper water and it refuses to start and if you get it to start it refuses to idle. I've resorted...
  7. wynjim55

    Low revs issue

    The answers to my questions on this forum have helped me to rectify a number of problems with my 1978 Mariner 55hp 2 cylinder outboard (Yamaha built), I am thankful to you all for your advice and knowledge. I've now had this outboard for over 12 months so I'm getting to know it fairly well. It...
  8. wynjim55

    Battery isolation switch - why use one?

    Is there a reason to use a battery isolation switch on small craft where only one battery is used for all purposes? Is there a need to have an isolator? So far I haven't been on the water over night so running my start battery flat while out isn't a problem (I have upgraded all my old...
  9. wynjim55

    Battery recharging - external to outboard

    Would it be safe to attach a mains power battery charger to a battery installed on a boat while it is still wired in but isolated from the outboard motor by use of an open switch? I don't intend to permanently wire in the charging unit, just trying to make it more convenient than removing the...
  10. wynjim55

    Repower contemplation

    I am currently pushing my old late '70s 15'/4.5m fibreglass half cabin boat with the original 55hp 2 cylinder 1978 Mariner it was fitted with from new (only got this outfit last year). I am considering re-powering to a more modern outboard but am unsure which way to go. We (3 kids, wife, and I -...
  11. wynjim55

    Starter motor woes

    Today my outboard started nicely and ran flawlessly all afternoon. However, on subsequent starting a few times, on first hit of the key it would only turn over very slowly. Not wanting to drain the battery too much I would stop cranking the motor before giving it another try. On the second of...
  12. wynjim55

    Excess powerhead oil escaping via exhaust??????

    Today I ran my outboard in the driveway with the hose attached and found that there were some blobs of black goo, oil like but definately not new looking. This stuff was being thrown out from the exhaust a short distance while the outboard was running, some of it washed off the concrete and...
  13. wynjim55

    Ehxaust relief

    What does the exhaust relief look like, and where would I find it, on a 1978 Yamaha built 2 cylinder Mariner 55? What does it do?
  14. wynjim55

    Harbour water allergy

    My 1978 Mariner 55 (2 cyl Yamaha version) hates the water at our local boat ramp. It will start effortlessly in the driveway, runs beautifully on the water, but hates starting/idling when the boat is sitting in water (not just at the one boat ramp). Last year I stripped and cleaned the carbs...
  15. wynjim55

    Fuel flooded starter motor wiring

    This post is more of an awareness raiser than an issue that needs solving. For some time I have been having intermittent problems with my starter motor which I assumed, due to age, was caused by poor wiring connections or worn brushes inside the starter motor base. The motor sometimes works...
  16. wynjim55

    Mechanical steering - sticking

    I've had my boat for a little over 12 months now and what may be common knowledge to a lot of others is all new to me. If you have what seems like a very obvious suggestion re this problem please post it. Unfortuantely I keep my boat out in the elements with only a tarp style cover and every...
  17. wynjim55

    Fuel pump

    I have a 2 cylinder Mariner 55hp built by Yamaha. I'd like to replace the fuel pump as the outlet nozzle was broken when a friend overtightened the worm drive clamp. Looking online I see a lot of units advertised for 25hp - 90hp except 55hp 2 cylinder. Is there a reason for this or did someone...
  18. wynjim55

    Steering cable seized

    I bought a new cable earlier this year and haven't had any problems with it at all. For the last week we have had an unusually large amount of rainfall and today I found that the steering cable on my boat is seized. I last used the boat about 6 weeks ago so I was quite surprised (shocked) to...
  19. wynjim55

    Oil for old tilt trim hydraulic pump

    I have a late 70's/80's trim unit that seems very common amongst Mercury and Mariner engines, same as the one in this post: http://www.marineengine.com/boat-forum/showthread.php?395793-Trim-Pump-bleed-help-please-help! One place I contacted looking for oil suggested I use Castrol Outboard Gear...
  20. wynjim55

    Low revs problems

    My friend has a problem with his 2006 Mercruiser 3.0, it idles rough, has difficulty down low (hesitates, almost dies), but runs perfectly at higher revs. When he slows down from fast running, either slowly decreasing revs or quickly decreasing revs the engine dies. The fuel plunger (inside...
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