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  1. M

    Honda BFP60A will not exceed 3800 rpm

    It should be OK to briefly run it up to 4000 or 4500 just to see if it will do it, just don't keep it there for long. I wouldn't go full throttle to see how high it goes or anything, just briefly ease it up past 3800 then back to idle. If the computer is limiting it to 3800 then you'll know...
  2. M

    90hp Nissian won't open up

    He's basically telling you he thinks it's not getting enough fuel because the carburetor is clogged up, and you can test the theory by opening the throttle and adding some fuel manually. In this case he suggested WD-40, which is flammable. Any flammable spray would work; carburetor cleaner...
  3. M

    90hp Nissian won't open up

    What is the serial number for your motor? Not to be confused with the model number.
  4. M

    Honda BFP60A will not exceed 3800 rpm

    Out of curiosity, will it rev past 3800rpm in neutral, or in gear with the prop removed? The goal is to figure out if the ECU is limiting the RPM for some reason, as opposed to just not making the power to pull past 3800rpm while pushing the boat.
  5. M

    Honda bf50 spark and carb issues

    I just ordered some Rydlyme, after much reading that seems to be the safest one for aluminum alloys (engine block). These descalers are acid based as acid readily dissolves calcium, salt and similar deposits, but it also dissolves aluminum so they have to add an inhibitor to reduce its...
  6. M

    Honda bf50 spark and carb issues

    Ah I think you are having what I believe is a common Honda thing. Crumbs of stuff are clogging the pee tube, the the water is still circulating through the rest of the motor. Stick a weed whacker string up the pee tube, and/or shoot some water or air backwards through it and see if it starts...
  7. M

    No rpm but idle

    That's definitely a clue, though even running on 1 cylinder I would expect it to rev when you open the throttle. But for sure there's a problem with one of the cylinders, so next check the bad cylinder to be sure it's getting a spark.
  8. M

    Tohatsu 25 hp , 25MC2 electric starter, gray color

    I agree with Paul, see if a shop will repair your old one. Or see if you can find a used one in good shape on ebay. I tried one of the aftermarket starters on my Honda and it was weak and lasted a very short time, a few months if I remember correctly. I ended up buying a used OEM starter on ebay.
  9. M

    No rpm but idle

    I suspect something is wrong in the carburetor, probably the main jet clogged. When you cleaned the carburetor did you fully disassemble it and shoot cleaner and compressed air through every hole?
  10. M

    No rpm but idle

    If you open the throttle and tap the choke (or put the choke on 1/2 or 3/4 if you have a manual choke), does it run better for a moment?
  11. M

    8hp starts but runs only at high rpms

    At the tippy top of the cylinder you can get a ridge that is smaller diameter than the rest of the bore. Sometimes it's difficult to pull the pistons out past the ridge and there's a tool to cut down the ridge if necessary. If the bores are glazed then I would run over them with a hone before...
  12. M

    No rpm but idle

    My initial impression is a carburetor issue. Did it sit with gas in it for some time? Give the carburetor a good cleaning, shoot cleaner and compressed air through every hole. Or before that, squeeze the bulb on the fuel line. If that temporarily resolves it then look for a fuel pump issue...
  13. M

    8hp starts but runs only at high rpms

    Is this as much a fun project as it is practical by chance? ;) That carbon on the piston should scrub right off with hot water, soft scrub or similar cleaner and a scotch bright or similar scrubby pad. The hot water will soften the carbon over time and make it easier to remove. Might as...
  14. M

    8hp starts but runs only at high rpms

    Check if the valves or seats have coatings that shouldn't be ground. Maybe that's only on performance engines, but it's worth checking. Then if you want to lap them, instead of a drill maybe use something gentler like the suction cup on a wooden stick that you can suck to the valve then lap by...
  15. M

    8hp starts but runs only at high rpms

    No that looks normal. Exhaust valves get hotter so they burn off more than the intake valves. If you want a quick and dirty test of the valve seats; set the head up on its edge, make sure the top valves are closed and fill the port behind the valve with carb cleaner or alcohol. Look at the...
  16. M

    Honda BFP60A will not exceed 3800 rpm

    If that grommet doesn't do it (hopefully it will!), I just ran across this, which I've never heard of before this but apparently is a thing; on some motors if the trim sensor goes bad the computer might limit the engine RPM if it thinks the motor is trimmed up. I have no idea if this is one of...
  17. M

    8hp starts but runs only at high rpms

    New rings and head gaskets won't hurt I suppose, but I think you're jumping the gun a bit and it might not be necessary. Your compression numbers look low, but if the motor has an automatic compression release (most motors do) then that might be why the numbers are low. The manual will likely...
  18. M

    8hp starts but runs only at high rpms

    Was the motor running OK one day then not OK the next, or did the performance degrade over some time? The compression being identical in both cylinders makes me think that a leaking head gasket or piston damage is unlikely. Although if the motor has a compression release then the compression...
  19. M

    8hp starts but runs only at high rpms

    I've been going under the assumption this was a 2-stroke, is it a 4-stroke? First, did you have the throttle wide open when you did the compression test? If no, then repeat with the throttle full open. If it's a 2-stroke; you're at roughly 1/2 what the compression should be. I would...
  20. M

    2004 Tohatsu 6 hp 4 stroke,Can't get lower unit back on...

    I have the same motor (whatever revision they were producing in 2012), it takes patience the first time you do it. Shine a flashlight up the mid-section before you start so you can see what's in there, that might help you visualize where you need to put the shaft.
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