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  1. M

    Mystery Motor

    I bought a 4hp Evinrude on ebay last year. The seller said it was a Seahorse model. The model number is 49B36D. This model number doesn't appear on any of the parts sites. The nearest I can find are 4904D, 4932D and 4933D which are 1979 models. The motor looks like it could well be a 1979...
  2. M

    Seized 4hp Seahorse

    I've just bought a 4hp Seahorse on ebay as a restoration project for my 11 year old daughter. Apparantly it ran last year but was not winterized and it is now seized. We have removed the head and soaked the pistons in penetrating oil but still no movement. What next? Do we try applying...
  3. M

    Dream start

    I have a dream of starting my 1974 15hp Evinrude from cold in 2 pulls of the starter rope. I did a major rebuild over the winter which has improved things considerably but a 2 pull start is still rare.<br />A start usually goes like this: Open tank breather, set throttle to start position...
  4. M

    Neutral safety switch wiring

    I have a 1974 15hp electric start Evinrude. The neutral safety switch has just given up and before I replace it I would like to be sure of the correct wiring. Currently it breaks the main supply to the starter motor i.e. it does not prevent the solenoid from working but does prevent the...
  5. M

    How bad is old fuel?

    I've heard a lot of mention on this forum and elsewhere on the perils of old fuel. I have left fuel in my motor all winter for a couple of years now and I have also used fuel that has sat in the tank all winter. Having done so I was expecting to find gum and varnish in the carb when I...
  6. M

    Inflatable rollers

    I have seen a few sites now offering inflatable rollers for launching boats off beaches. <br />Has anybody tried them? Are they any good? <br />The pictures are all of them being used on GRP boats with a well defined keel - how would they work for my inflatable?<br />All advice / experiences...
  7. M

    Achilles inflatable age

    I bought a secondhand Achilles SJ110 inflatable a couple of years ago. When applying for third party insurance I am always asked the age and have to say that I have no idea. Can anybody out there help me be more accurate please?
  8. M

    Reed plate

    1974 15hp Evinrude.<br />I've removed the reed plate and found that I've got a 5 thou gap between one reed pair and the plate. The problem appears to be the plate not the reeds so I'm intending to use some wet and dry on a piece of glass to flatten the plate. At the moment I am unable to do...
  9. M

    One lean, one rich

    I've just rebuilt my 1974 15hp Evinrude. During the first hour or so it ran real well but then started to run on one cylider. I've done all kinds of checks and found that the top cylinder is running a lot leaner than the bottom. (I found this out by disconnecting one plug at a time and...
  10. M

    Timing marks

    My 1974 15hp has breaker point ignition. I have set the points as best I can but I would like to be sure that the timing is spot on. The manual says I can use a timing light for this but where are the timing marks? There are 4 likely looking marks on the flywheel which isn't very helpful on a...
  11. M

    Special tools, or is there another way?

    I'm in the process of a rebuild of my 1974 15hp. Reading through the Clymer manual I find mention of removing and fitting piston wrist pins in a piston cradle and using a special tool to push the pins. Is the cradle necessary? Is there an easy alternative? What about pin pushing tools - can...
  12. M

    Accurate points timing

    My 1974 15hp Evinrude has got points based ignition and I understand the timing is set by getting the points gapped correctly. This leaves me with the following questions:<br />1. How accurate is this?<br />2. Does a wider gap give advanced or retarded timing? (If would much rather go retarded...
  13. M

    Any more ideas?

    My 1974 15HP Evinrude is running well on one cylinder and hardly at all on the other. The spark is strong, I've got new points, condensors and coils, I've checked the timing. Compression test gives 90psi on each cylinder. I've swapped plugs to check that they are OK. What else can I try?
  14. M

    Electrical connectors / starter current

    I have a 1974 15hp elecric start Evinrude that I regularly remove from my boat. I am looking for some kind of plug and socket for the 2 wires that connect the motor to the battery. I am currently using a plug and socket that are not designed for marine use so corrode badly. I have seen one...
  15. M

    Missfire and smoke on 15hp Evinrude

    Hi guys.<br />I've just put my 1974 15hp Evinrude back together after dismantling just about everything. It started easily and ran well at first but after a while it started to get more smokey and every few seconds it missfires,sometimes with a slight backfire, almost stops and then runs OK for...
  16. M

    Plates

    On my 1974 15HP there are 2 plates, one with the seriel No. and one with starting instructions. I want to remove these for repainting and refix. The current fixings appear to have a very small hexagonal head - can they be unscrewed? - or are they just hexagonal rivets? - any ideas gratefully...
  17. M

    Oxy acetylene?

    I am contemplating the removal of four very rusty screws from an aluminium housing. My agricultural and automotive experience of shifting rusty screws from steel and cast iron housings would incline me to heat the screw with the oxy-acet torch before attempting removal. Do you experienced boat...
  18. M

    anode on 1974 15hp

    Should my 1974 15HP Evinrude have a sacrificial anode? If so where should it be?
  19. M

    Rubber bushes

    Calling all OMC Experts! Having removed the powerhead from my 1974 15HP Evinrude I looked down into the leg and saw a mass of perished rubber where the top of the leg joins to the main pivot. I removed the 2 bolts that secure the leg and they brought out with them 2 metal tubes that looked...
  20. M

    Painting powerhead

    I'm looking at a pile of powerhead pieces that are in need of a repaint. Should I paint them individually, or is it better to reassemble the unit and then paint it? It appears that it was previously painted as one unit, which I am guessing will protect it better, but I do want to be able to...
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