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  1. M

    8hp starts but runs only at high rpms

    It's difficult to tell from the picture but I'll take your word for it not being flat. The challenge is if it's not flat the gasket may not seal well. A machine shop can make it flat for you, or the shade tree method is to glue some sandpaper to a sheet of glass or something else flat and drag...
  2. M

    Tohatsu m50d - Dragging piston with spark & Fuel

    Going on what you posted; compression on #3 should be "good enough" to fire I believe, and you have spark. The #3 not sucking like #1 and #2 is a big clue. Look down into the reed valve area, or take it apart if you can, and check if one of the reeds has failed or if something is stuck in it...
  3. M

    8hp starts but runs only at high rpms

    If you align the two marks again then you should be set. After aligning them, turn the motor over by hand once to take up any slack in the belt and re-check the alignment. If you want to double check yourself, look in the service manual and it will tell you which marks on the motor to align...
  4. M

    Thermostat on a Honda BF 45 outboard.

    The thermostat is on top of the motor on the port side, under the black flywheel cover.
  5. M

    2017 20 hp honda electric start

    You need 3 things to run; fuel, compression and spark. One of the 3 are missing. Spark is the easiest to check for. Take one of the spark plugs out, put it in the plug cap and put the metal part of the spark plug against a metal part of the motor. Hit the start button and look for a spark...
  6. M

    put put POOF - Mercury 9.9 2-stroke

    On an old Mercury 9.9 2-stroke, the model that twisting the grip both changes the throttle and shifts F-N-R, the motor idles fine and generally runs fantastic, except at may 10%-ish throttle, trolling speed. At that speed it will appear to be putting along just fine, then suddenly a big deep...
  7. M

    Descaling flush, motor that stops peeing

    I'll give that a try. When I stick a very long weed whacker string up the tube as far as it will go when it's clogged, that does not unclog it which made me think the problem was farther back in the motor somewhere, but I will try that next time I'm fiddling with it, maybe the extra water flow...
  8. M

    Descaling flush, motor that stops peeing

    @ahicks thanks for the tip on that failure spot, you hit the nail on the head for my concern (doing more damage than good). It bothers my OCD that the pee tube clogs up, but logically it's obviously not causing problems as I've made several long high speed runs with it barely dribbling without...
  9. M

    Honda bf50 spark and carb issues

    What did you do for the flush, out of curiosity?
  10. M

    Thermostat

    Some motors do barely dribble when the thermostat is closed. The Mercury 9.9 2-stroke is one such motor, it barely dribbles until the thermostat opens then it's a good solid stream, until the thermostat closes again. I copied the parts schematic below, you can see the pee tube is on the exit...
  11. M

    Honda BF8D no start

    If it was working perfectly before storage but now has a problem after being stored with gas in it, then I would say 95% chance the issue it's carburetor related. Does it have a manual choke? If it runs perfect once started but requires extra fuel to get started, then I would check on the...
  12. M

    Thermostat

    As far as I'm aware, the Honda's all pee right away. Start by sticking something like weed whacker string or a coat hanger or something else stiff up the pee hole and see if it's clogged with something. To your point; we've got a little Mercury 9.9 2-stroke that only barely dribbles when the...
  13. M

    Cutting out and stalling

    If you think it's a heat related problem, which is not unheard of with electronics, what you can do is start it on the muffs or in a bucket and get under the hood with a hair dryer and carefully heat suspect components to see if you can induce a failure, then check if cooling the part resolves...
  14. M

    Honda bf50 spark and carb issues

    Link to the descaling thread: https://forums.iboats.com/threads/descaling-flush-motor-that-stops-peeing.747060/
  15. M

    Descaling flush, motor that stops peeing

    If the eBay listing that I borrowed this picture from is correct, then this is the bottom of my block. The bits must be in this water channel. I need to find the pan that goes under here to get a better idea for what the channel shape is. If I were to tilt the motor up, the left side of the...
  16. M

    Descaling flush, motor that stops peeing

    The clog is happening inside the block. On these little Hondas the pee water opening is on the lower bottom of the block with a little hose that runs to the nozzle. When it's clogged, sticking weed whacker string up as far as it will go does not clear the clog, so it's happening somewhere back...
  17. M

    Honda bf50 spark and carb issues

    You won't need 5 gal. I just did this to my 50 (just posted a new thread about it). 1/2 gal descaler mixed with 1/2 gal water in a 5 gal bucket was plenty.
  18. M

    Descaling flush, motor that stops peeing

    This is to share the results of a little experiment. Backstory; my 99' Honda 50 has lots of hours and gets year round use in salt. It has built up enough crumbs of sediment that the pee tube frequently gets clogged and the stream slows to a dribble or stops. The rest of the motor is flowing...
  19. M

    Honda BF8D no start

    Since it was perfect when you put it away and now with nothing other than storage, it's not running then you're still more than likely looking at a dirty carburetor issue. Did you only clean the main jet, or did you also clean the pilot (slow speed) jet too? Some of them have EPA limited...
  20. M

    Honda BF8D no start

    If it runs for a few seconds on starting fluid then stalls, then you've got a fuel problem for sure. When you cleaned out the carburetor, did you also put cleaner through the holds in the carburetor itself (not just the jets)? Warning: keep the carb cleaner away from o-rings and seals, it...
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