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  1. M

    Honda BF90 Low Compression

    Quick and dirty check for leaky valves: set the head on its edge, intake side up, and fill the intake pockets with alcohol. Look at the valves on the combustion chamber side to see if any is leaking through. Flip and repeat on the exhaust side. Since your leakdown test showed air crossing...
  2. M

    Honda 50 Ticking/Whirly Sound

    If you can do it without touching the insulation on the coil, at all, grab a little file and knock down that metal where it's shiny a little bit, maybe 0.5-1mm. It definitely looks like that has been touching. My guess is the magnet is swelling, and if it touches too hard it might damage the...
  3. M

    Engine races, no power

    I agree with the two above, prop is the most likely culprit. When you remove the prop look at it and see if you hit something, or if you just have bad luck and it failed.
  4. M

    9.8 hp Tohatsu smokes on startup

    Cold 2-strokes will smoke. Also some 2-stroke oil is smokier than others.
  5. M

    Honda 50 Ticking/Whirly Sound

    It's a shame when they shut down old threads about motors that people are still using. The issues and fixes are still relevant, the thread is still useful.. until they close it.
  6. M

    Honda 50 Ticking/Whirly Sound

    Maybe the magnets on the flywheel. Here's my story: I've got the 99' 50. About 2 years out of warranty it started making a knocking sound, only when it was hot, I thought a rod bearing was going bad or something. Turns out it was the magnets on the flywheel, there was a known issue with them...
  7. M

    2015 Honda 50HP suddenly dies (sporadically)

    Before you go taking things apart, try to figure out what's missing. You need spark, fuel and air/compression to run. First figure out which one is missing, then figure out why. It sounds mechanically OK so compression is most likely good, skip that one for now. Get it to the point where it...
  8. M

    New to me 2020 Tohatsu 9.8 unable to go past 70% throttle, won't restart hot.

    If your 9.8 is similar to my 6, running it until it stops does not fully empty the carburetor. You need to open the drain on the bowl to get it empty, then pull the rope so it sucks whatever is in the jets out. It's possible the previous owner ran it until it stopped but didn't drain the bowl...
  9. M

    2012 Tohatsu 30hp 2-stroke jet bogging at WOT

    Look carefully at the float valve area of the carburetor, make sure nothing is blocking the hole. I had a bit of rubber from a fuel line partially block the float valve on my Honda causing that carburetor to run out of fuel. Take the float out and blow air backwards through the hole and try to...
  10. M

    honda bf15 runs for about 20 seconds and shutsdown

    When it stalls, immediately check 2 things. First make sure there is spark; stick a spark plug in the boot, ground the side of the plug to a shiny metal part and pull the rope or hit the key and look for a bright spark. There are also spark testers available if you prefer to go that route...
  11. M

    Nissan ns5b running rich

    If you're 100% sure it's running rich and not lean, then my first guess would be a sticking float that's flooding it. Or maybe the choke isn't turning off all the way, double check that the choke is turning off completely. My real guess is your main jet is clogged and it's actually getting too...
  12. M

    2004 Tohatsu 90hp tldi error code 7000 and the battery light

    Ask yourself, if the air compressor starts coming apart is it possible for it to put bits of metal into the motor? If yes, then you may want to remove and disassemble or at least give it a good inspection before running it more, if you think it's the air compressor that's locking up.
  13. M

    2004 Tohatsu 90hp tldi error code 7000 and the battery light

    The lower end locks up when you put it in gear? Can you elaborate on that, do you think the gearbox is locking up?
  14. M

    honeymoon over...MFS6D

    My two thoughts (1) Replace the spark plug. I've had failing spark plugs act like it's overly lean before. You just get a weak spark and a bad burn so the motor acts lean. Try this first only because it's super easy. (2) It's more likely you've got some junk in or around the pilot jet. Has...
  15. M

    Unreliable spark Tohatsu MFS6C

    Does the shop manual give a method for testing the ignitor?
  16. M

    2007 Twin BF50's all guages dead.

    It depends on your boat. Start at your batteries and follow the cables.
  17. M

    Tohatsu 9.9D2 after wrong modification?

    I would guess the original cam probably doesn't open the carburetor all the way.
  18. M

    Hard to pull start

    What happened just prior to the problem starting? Was it fine before you took it apart? Double check the compression release mechanism, make sure it's working properly. This may not apply to that specific motor, but on some motors if the valve clearance is too big, the compression release...
  19. M

    going into limp mode

    Can you read the codes from the motor to see why it's going into limp mode? That's probably the best place to start.
  20. M

    2008 BF150 exhaust thru water intake

    I'm not an expert on that motor, but exhaust from the water intake does not sound normal.
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