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  1. M

    Nissan 50hp issues

    Could be a head gasket, that's one of the more common causes of water in the cylinders. I would personally fog the heck out of the motor with fogging oil, to try to displace as much water as possible inside the motor, then take the head off and inspect it. If it looks fixable, get it running...
  2. M

    Bulb

    Is it a 2-stroke / 4-stroke, and if 4-stroke is it the carburetor version or the EFI version?
  3. M

    Nissan 50hp issues

    Start with completely cleaning the carburetors. Ultrasonic cleaner, air, carb cleaner, make sure the tiniest passages are squeaky clean. Then re-evaluate.
  4. M

    How to manually check codes NSD90B TLDI

    Out of curiosity; on that model motor, do you adjust the TPS itself (slotted mounting holes, rotate the sensor to adjust it), or is the TPS itself fixed and you instruct the ECU to learn whatever the TPS reads at idle?
  5. M

    How to manually check codes NSD90B TLDI

    Check if the TPS itself has slots or round holes for mounting. If it has slots, you'll need to adjust it to a specific value when you install the new one. If it has round mounting holds then just bolt it on, though there may or may not be a TPS calibration procedure for the ECU in this case...
  6. M

    How to manually check codes NSD90B TLDI

    Next check if the TPS is working properly. You need to supply 5V to the TPS then check the feedback wire to read 2 things: (1) what does it read at idle, and does that value match the spec in the manual, and (2) does the value change smoothly as the throttle opens. If it does not then there's...
  7. M

    How to manually check codes NSD90B TLDI

    Taking a guess, I would say the low battery voltage is leading to the low TPS voltage. Most likely it's a 5V tps, check the wires to the TPS and see if the V+ line is giving anything close to 5V. If the TPS is getting 5V then you might have a faulty TPS. If the TPS is getting something less...
  8. M

    Low Compression Top Cylinder NS25C3

    Measure it with a strait edge. You can DIY the head if you're careful using sand paper and something very flat, like a piece of glass or granite table, etc.. with very even pressure you can drag the head around in a figure 8 until it's flat. The block is going to be more tricky. It can be...
  9. M

    Stiff steering

    I've had good luck putting a boot over the exposed portion of the cable. This seems to extend the life of the grease and keep the water out. This is what I'm using now: https://www.amazon.com/gp/product/B001PRYGAW/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
  10. M

    Low Compression Top Cylinder NS25C3

    You need a lot of oil to displace any water. But before you put that back to together, you must make sure the head is flat and the top of the block is flat (and clean). If they're not flat, it's just going to blow the gasket again right away. Also I would use an OEM head gasket if it's...
  11. M

    Low Compression Top Cylinder NS25C3

    It's hard to tell from the pictures, but it looks like on the top/left of the block there is a carbon stain where perhaps the head gasket was leaking. What's odd is how clean the lower head and piston are compared to the top. That gives the impression there may have been water getting into the...
  12. M

    Tohatsu 2-stroke impeller

    Drop the lower unit, inspect the impeller to be sure you didn't harm it running it dry. Then put the gearbox in forward gear and turn the prop forward with your hand. Which way does the shaft turn? This is the way you should turn the shaft when lowering the cup over the impeller. Put a thin...
  13. M

    Stiff steering

    Sounds like the guy was forcing the cable out. If the cable is difficult to remove completely, you may not need to remove it completely. Remove it as far as you can, clean the part of the tube that you can access then check how it works. If the cable comes out easy it will likely go in easy...
  14. M

    Tohatsu 2-stroke impeller

    As mentioned above, if you're using muffs now, first test it in a bucket or barrel of water, and the water level must be above the water pump. If it works in the barrel but not with the muffs, then your muffs aren't delivering enough water, probably because your hose isn't giving enough water.
  15. M

    Help! Tohatsu MFS4/5/6 oil leak

    See if you can put A LITTLE BIT of pressure in the crank case with the air compressor then check for where the air is leaking out. Maybe a pound or two of air, not enough to pop any seals out but enough that you can possible figure out where it's leaking from.
  16. M

    Stiff steering

    Cleaning out the tube with a brush and some solvent is very easy, the hard part is getting the cable in and out. ;)
  17. M

    Help! Tohatsu MFS4/5/6 oil leak

    Are you sure it's the new oil that you're putting in which is leaking out, and not left over oil from being stored wrong making its way out the exhaust?
  18. M

    2003 Honda BF8 No Compression

    Without more context, that looks like it could be the compression release mechanism. Depending on how it works, a missing part might be your problem. It's impossible to say from here with the info given so far.
  19. M

    Stiff steering

    If it's stiff from old grease, I would remove the cable from the motor then use a stiff brush like a shotgun bore cleaning brush or other that will fit snugly inside the hole, saturate it all with WD-40 and scrub like crazy, or put it on a drill. The WD-40 (or your favorite solvent) will...
  20. M

    compression issue

    By pulling the rope. Start by making sure they're all moving and no parts appear to be bent or missing, then check the clearances against spec. The clearance info is sometimes on a label on some motors, or it will be in the service manual for sure. Also take a look at the spark plug and look...
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