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  1. Sea Rider

    M40D2 water system question

    Paul, Just to know, by upper housing you mean the existing old one or it's a different newer model ? Which newer parts will that be, the ones located right above the housing mentioned in the part's schematic diagram numbers 29-31-32-33 ? Happy Boating
  2. Sea Rider

    Thermostat housing hole.

    That's the procedure every motor manufacturer recommends their clients to go for, still isn't known if the factory uses it, uses a vaccum gauge or whichever other method which probably will never know. Friday will measure a 3 cylinder carbed motor which their carbs has not been manipulated nor...
  3. Sea Rider

    M40D2 water system question

    Can you post a pic of the water pump case showing the mentioned orifice. Have never disassembled a 40 HP to see what its water pump looks like. Does the upper pump's case where the drive shaft passes by has a built in rubber seal, whatever adjacent to the drive shaft ? does the drive shaft has...
  4. Sea Rider

    Thermostat housing hole.

    Before installing the air silencer back, report if all all carb's once hooked to the tall vertical link rod remains closed at min/idle throttle grip position. My boating Club has a new out of the box 2 T Yam 60 HP, just per pure fun will check the pilot's screws factory gapped to to see how...
  5. Sea Rider

    Upgrading from 2 stroke to 4 stroke

    If wanting to get the max fun out of that combo need to buy a cheap induction tach, install it, program the spark plug firing sequence, go for a wot run as loaded and report max wot rpm achieved on flat calm water cond. Need to know which pitch is currently installed to go from there to less...
  6. Sea Rider

    Thermostat housing hole.

    That's fine, just wanted to know how close or appart the pilot's screws were gapped with respect to each other. If the carbs have not been previously fiddled with should retain their factory settings delivered with. With all carb's floats leveled to 15 mm the motor should idle spot on. Happy...
  7. Sea Rider

    M40D2 water system question

    Orifices built on Tohatsu's lower legs are usually water drain ports, seeing an abnormal amount of water compared to previous amount happened when running the motor on muffs ? Is there any other water drain orifice besides the mentioned one located on the lower leg ? If there's a good flow of...
  8. Sea Rider

    Twin Engine Mounting Dimension

    Such data must be stated in the Yam's 225 HP Owner's Manual, a matter to check. Happy Boating
  9. Sea Rider

    What Pitch To Buy

    Usually one less pitch when going for a 4 blade prop. What's the max wot rpm achieved as loaded with the 3 blade 21 prop ? Happy Boating
  10. Sea Rider

    Honda BF90D Water Pump Testing - Water pouring out of the side covers - Is this normal?

    With motor ON and removed cowl check if the base where the crankcase sits on pan has accumulated water, if so, torque back all lower bolts that locks the crankcase on pan, if the issue continues may have already a shot base gasket that will need to be replaced ? Happy Boating
  11. Sea Rider

    Thermostat housing hole.

    Is it possible to upload a pic of the float showing what indicated. Does all 3 carbs have the same condition ? So the carbs have 3 new valve seats installed and well base seated. Are the float's needles the previous ones or were replaced for new ones ? Out of curiosity, were the pilot's screw...
  12. Sea Rider

    Updating the motor on an old boat

    Yep was thinking same, a 2 stroke Yam 60 HP well propped will please his father well... Happy Boating
  13. Sea Rider

    Starting point for correct prop for cabin cruiser

    If the wot rpm range is 4200-4600 rpm factory stated for said motor and powered with a 25 pitch prop achieving just 4000 wot rpm, the motor is only 600 wot revs from max range, going down 3 pitches max shoud put that motor revving at max 4600 rpm that's if the +200 wot revs increment per one...
  14. Sea Rider

    M40D2 water system question

    So far can't interpret the fisrt pic, too close-up shot.. Before going for a new upper case and complete water pump kit, with removed lower leg sitting in a container filled with sufficient water level to cover both water intake screens, install a drill machine on upper drive shaft splines make...
  15. Sea Rider

    Nissan NS25C3 2 Stroke 25Hp Tachometer Installation Assistance

    Diameter it's what the prop manufacturer wants to play with, usually not available with the diam one is looking for. Need to have the new tach in working order to wot test a 11 pitch prop as a starter prop from previous 13 one. 750 pounds it's a light feather champ combo, a 30 HP well propped...
  16. Sea Rider

    Prop question

    What's the min-max wot rpm range factory stated for said motor ? if 5500 its the max wot rpm go for a OEM 131/4 x 16 prop, should put the motor revving righ at 5500 rpm as previously loaded. Happy Boating
  17. Sea Rider

    Thermostat housing hole.

    Assumed that were finishing the house repairs, take yout time. Friends that lives in Plano-Texas are experincing same awfull extremely cold weather. Before buying more induction tachs would be nice to check if the motor stills runs smooth at idle with their respective pilot's screws gapped back...
  18. Sea Rider

    Updating the motor on an old boat

    If that's what your father wants then please him. You can always prop right a much less HP motor from current one to run middle to max of its wot rpm range. Max motor HP its for Max passenger rated for, if with much less souls on board don't need to go max HP rated for. Happy Boating
  19. Sea Rider

    DuoProp choice ?

    The dealer and many others as well recommends the lower pitch prop over the other, thumbs-up for that!! If pulling toys, skiiers top hole shot is what it takes. Happy Boating
  20. Sea Rider

    Nissan NS25C3 2 Stroke 25Hp Tachometer Installation Assistance

    Going back to your previous post : Hey there, about to do the same thing on my engine. I have a little aluminum prop on my motor now but will move up to SST. No need to dump money down the drain going for an expensive SS prop for just a 30 HP motor, an Alum OEM or Solas 11 pitch prop will...
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