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  1. M

    Honda BF4?

    I didn't know such a thing existed! Is there rubber for both sides?
  2. M

    Honda BF4?

    The Tohatsu vibrates a LOT above idle speed. I use it on an aluminum boat and it makes the whole boat rattle, and the fishing poles vibrate across the seats. At anything above idle you have to yell to communicate over the noise of the boat vibrating. It's probably less of an issue if you're...
  3. M

    Honda BF4?

    I did not know Honda had a 6HP! I've only seen the 5HP. If I strike it rich, I'll swap out my Tohatsu 6HP for a Honda!
  4. M

    Honda BF130 problems, needs input

    Great job! Did you end up re-using the old head or obtaining a better one? Cool project, keep us informed!
  5. M

    2004 TLDI MD90, unable to pull any codes/engine hours and no beep when turning key, cranks up fine

    Did you check if the TPS is faulty? Watch your meter while you slowly open and close the throttle, the voltage should change smoothly. Any jumps or gaps indicates a problem. If you don't have a meter, this one works great and powers the TPS so you don't even have to have the motor powered up...
  6. M

    Older 25 HP 2 Stroke

    You have to take the head off and inspect it to see what really needs to be replaced. If the cylinder looks bad (scratched up), look carefully to see if it's actually scratches or if it's metal bits from the piston embedded on it. If it's piston bits, and if the cylinder is plated (very...
  7. M

    Older 25 HP 2 Stroke

    You've got spark; a overly simple compression test is shoot some starting fluid or something similar into the open carburetors and see if it will fire. If it starts for a brief moment then stalls, then compression is probably OK and you're missing fuel. If it won't fire, then check...
  8. M

    Older 25 HP 2 Stroke

    Compression. Possibly water in the cylinders. Check the easy stuff first though, such as spark. Maybe the lanyard got pulled or a wire came loose, etc..
  9. M

    Older 25 HP 2 Stroke

    To run motors need compression, fuel, air and spark. One of those is missing, your mission is to figure out which one. :)
  10. M

    Honda BF130 problems, needs input

    Basically that head most likely will not be reliable, so if you want a reliable motor then a new head is the way to go, but if you're OK with the risk in exchange for fun then go for it with that head. As you suspect, valve clearance (and higher than spec compression) may be an issue after the...
  11. M

    Honda BF130 problems, needs input

    While possible, unless the leak is right next to the valve I would not think the source is the exhaust valve. But repeat the test on the intake side. If you have an intake that is leaking the same way, then that is almost surely a source, though maybe not the only one.
  12. M

    Honda BF130 problems, needs input

    My bet is corrosion ate a hole in the exhaust valve pocket, just like the holes where you can easily see it. I'm tending to agree with the above, that head is likely not serviceable. It might be fun to put it back together just for the experience and to see what happens (assuming you don't...
  13. M

    Honda BF130 problems, needs input

    Also looking at the top left, it appears there may have been a little water passage that he completely machined out. Maybe he needed to take a lot off to get a good surface, but he still should have taken it off square. At least it's a fun project at this point and not mission critical...
  14. M

    Honda BF130 problems, needs input

    <Edited> The surface looks a ton better, but it looks like they didn't shave it flat; they definitely took more off of those right two cylinders. They deserve a good smack upside the head for that one. When you put it back together, you might put some clay or putty on those flat spots and turn...
  15. M

    Honda BF130 problems, needs input

    Given that it was leaking, I would price what a machine shop would charge you to check it for flatness and maybe surface it to make it flat again, which will also make it a clean surface. If the price is reasonable it could be money well spent. Also they make a special chemical for removing...
  16. M

    Honda BF130 problems, needs input

    I personally wouldn't bother taking the valves out of the head at this point unless there is a specific problem you're trying to fix, a little bit of carbon on the stems won't make any difference so there's not really much to gain. Unless it's just a fun project in which case go for it.
  17. M

    Honda BF130 problems, needs input

    Try really hard to identify where the water was getting into #4, was it coming past the head gasket somewhere? I don't think the missing metal on the exhaust side was the water source. Also I suspect that whole area where the hole is, is probably very thin metal at this point. If you weld it...
  18. M

    Stall at high rpm!

    The video covers basic things too, like how to tell if you've got an air leak between the main tank and motor, or between the fitting on the motor and the fuel pump. There is some extra info, but it covers the basics too.
  19. M

    Stall at high rpm!

    This might help:
  20. M

    Honda BF130 problems, needs input

    Water itself isn't going to hurt anything. The exterior metal and cooling passages are all painted or coated so no risk to those, and even other parts like the head and valves are OK to get wet, just be sure they get dried so they don't rust. For those non-protected parts it's a good idea to...
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