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  1. M

    tank venting problems

    it seems that there are two plastic vent types - one is threaded all its length with an o ring and has to be completely unscrewed to vent the tank and the other (quicksilver type) has a channel cut in the thread which presumably means it will vent effectively when only partially unscrewed (a...
  2. M

    cutting out

    hi we tried my fletcher 16 for the first time (mercury 50hp 4 stroke 4 cyl) - all was well until we landed after a biggish wave then the engine cut out like it had rune out of fuel - we had half a 25 litre (plastic) tank left - the vent was open - the engine restarted and continued to run OK -...
  3. M

    badge engineering

    is there any mechanical difference between a mercury 50 hp 4 stroke 4 cyl (carb version) and the mariner and yamaha versions? or are they simply badge engineered? also what is the reliability of the mitsubishi (twin) coil packs fitted to the mariner version? (I have had one go awol on me) -...
  4. M

    mariner 50 4cyl 4 stroke suspect coil pack

    hi does anyone know the correct low tension voltage (fed from the CDI) for my coils? - I ask this because I'm getting approx 4 volts and I would assume 12 would be correct? thanks andy
  5. M

    start over

    as advised checked compression on my mariner 50 - way, way down on cyls 2 and 3 - stripped head - inlet valves not making a seal so will sort them -by the way why is a new head gasket £100 +VAT in the UK? - it should be made of solid gold at this price - rip off Britain again, wish I'd emigrated...
  6. M

    fuel filter

    I have a mariner 50 - I have fitted a small (2 inch long, 1 inch diameter) in line fuel filter - will this be Ok for the fuel supply rate of my engine? andy
  7. M

    fuel delivery problem?

    got a mariner 50 - we've noticed that when the engine is running the primer bulb is soft (it hardens up before initial running) and the inline fuel filter seems empty - tank is clean, new fuel line and bulb which pumps fuel fine when disconnected - tank vent is clear - could this be a fuel pump...
  8. M

    which prop?

    I have what I believe to be a 50 hp 4 stroke 4cyl merc (see my other blog) on my fletcher 16 arrowstreak the no stamped on the vengeance prop is :- 48-855856 A5 12P is this prop well matched to the boat/engine combination? there is no mention of my prop in the mercury manual prop listings -...
  9. M

    which outboard?

    I have a 1999 mercury 4stroke 4 cylinder - It was sold to me as a 50 but now I'm not so sure it is because according to the mercury manual all 50's after1998 had non adjustable carbs - mine are adjustable serial no is:- OT 117804 (2 march 1999?) Is my engine actually a 50? - I hope so! - and...
  10. M

    mercury woes

    hi got a 1999 mercury 50 hp 4 stroke 4 cyl on my 1971 fletcher 16 speedboat engine will tick over and maxes out on fast idle lever (out of gear) but will not rev past 2000 under load usually stalls when selecting gear prop is geared OK using fresh fuel fuel tank vent open have checked:- carbs...
  11. M

    new hope

    think I've cracked it - there was a split in one of the accelerator pump vacuum pipes which I guess results in a total loss of vacuum at the diaphragm - seems to have made a BIG difference to performance - will report back after next testing!
  12. M

    not maxing out

    I have a 1999 mercury 50 four stroke four cyl - it won't max out but hits a flat spot at half throttle and that's it - auto choke works and green/white wire is connected to the CDI - am using fresh fuel, new plugs - cambelt timing is correct, carbs are clean - it seems to be carb...
  13. M

    cambelt

    hi anyone know the symptoms of an incorrectly fitted cambelt on a 50hp 4 stroke 4? - I was thinking maybe a tooth out?
  14. M

    1999 mercury 50hp four stroke 4cyl - the lowdown

    thanks for the tip re airscrew settings I have a new fuel pump fitted which is pumping fuel from both outlets carb bowls are filling with fuel carbs have been stripped and carefully rebuilt - fuel levels are correct, all jets clean and blown thru electric choke operation ok engine starts first...
  15. M

    fuel pump test

    to test my fuel pump could I just connect some pipe to the two outlets, turn her over and see if fuel emrges from the pipes - (obviously just a few turns of the engine for safety) - seems a lot easier than running and squeezing the bulb
  16. M

    ptc heater

    what does the ptc heater do? is it the same as an electro thermal valve/ram? - is it a part of the auto choke? thanks
  17. M

    choke operation

    I have a 1999 mercury 935cc 4 stroke 4 cyl - I am currently using just the electric (commander 2000) key push choke which seems to work ok - is there any advantage in using the (disconnected) auto choke? can anyone explain the purpose of the uploader and electrothermal valve/ram and how they...
  18. M

    last blog

    I am referring to the electric (solenoid, push key operated) choke - not the electronic type!
  19. M

    ways to choke 1999 50 hp

    hi - I've got a march 1999 935cc mercury 50 4 stroke 4 the way it's set up the auto choke is disconnected - just got the electric choke working thru the commander control push in key arrangement - this system seems to work OK which begs the question - why did they fit an auto choke, unloader...
  20. M

    coughing on tickover

    my mercury 50 4 stroke 4 (carb type) coughs on tickover and sometimes cuts out - I thought it might be: air leaks between carbs and manifold valve trouble tight tappets any ideas?
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