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  1. 9

    1999 200HP OX66 surging/cutting out

    rail pressure while problem shows up should tell if that is the problem mechanical pumps tend to go bad quicker than you would think sometimes. I think monitoring pressure into the VST while problem shows up should point to that being a problem if it cannot keep up, but I am not positive on that...
  2. 9

    1994 Yamaha 130hp push to choke ignition won't work...

    just find out where the kill wire is going to ground and fix it
  3. 9

    Underpowered Yamaha 9.9

    Complete Motor model #, prop being used, weight being pushed, along with the WOT RPM is needed
  4. 9

    Carburetor question on restoration I’m working on 1992 40 hp MSHQ Yamaha

    water in the pan means wet wiring, that tends to short out things or lets spark jump where it should not. find where the water is coming from and solve that
  5. 9

    1999 yamaha 2 stroke 9.9 to 15hp conversion

    so if the 9.9 was propped correctly to hit the maximum WOT RPM, then turning it into a 15 would mean a different prop was needed to Keep the RPMs from over revving that same WOT RPM spec
  6. 9

    1999 yamaha 2 stroke 9.9 to 15hp conversion

    so does the service manual for a 15 have spec that it should run at higher RPMs than a 9.9? what about a 25 or 30 HP motor? maybe Boscoe can tell us on the 15 specs
  7. 9

    Yamaha 2.5hp 4-strk , impeller came apart - inside engine now ?

    since the pieces on impeller went into the tube from the pump, I would see if you could flush it out the same way it went in. not sure if you could rig up something to the stat opening to force water with water hose in from there
  8. 9

    Yamaha F150 Speedo Tube Disconnected?

    have you looked at your motor to see if that hose is even there? post #2 told you how
  9. 9

    Yamaha F150 Speedo Tube Disconnected?

    if you look at the parts diagram Boscoe posted for you, you will see where the nipple is located and where the hose is routed thru the hole in front of the upper casing
  10. 9

    1999 yamaha 2 stroke 9.9 to 15hp conversion

    the 9.9 is just a 15 that was modified at the factory to meet requirements on HP restricted lakes/ponds. dynoing a motor is the same for any type of motor. not many have the equipment to do it, but it shows HP and torque output curves most people swear how they modified motors and increased...
  11. 9

    Yamaha 2.5hp 4-strk , impeller came apart - inside engine now ?

    compressed air is used all of the time ,I usually use it while the motor is running on muffs so the air can move debris around and hopefully out with the rest of the water flowing out, removing the stat also gives it another exit point at the top of the power head. not sure, but maybe you are...
  12. 9

    Yamaha 2.5hp 4-strk , impeller came apart - inside engine now ?

    why afraid of pulling lower unit? that has to be pulled to replace the pump anyway. dropping the lower and inspecting the pump again is a very good idea since you ran the motor with not enough water to get to the pump. those pumps do not like pumping just air, you may have damaged it already
  13. 9

    1999 yamaha 2 stroke 9.9 to 15hp conversion

    only true way to find out would be to dyno the motor before and after the modification. with a 50% increase in HP would a different prop be needed also also it was mentioned the reed stops were different allowing the reeds to open more
  14. 9

    1999 yamaha 2 stroke 9.9 to 15hp conversion

    just as I thought the 15hp reed cost a little bit more that the 9.9
  15. 9

    1996 suzuki dt 85 lower unit removel?

    and do not wait so long to drop the lower unit and change the water pump. gives a chance to clean everything and lube it up, even the drive shaft where it goes into the power head. those are even harder to get apart if they rust together
  16. 9

    1990 Yamaha 250 VX 76. Power drops off.

    care to explain what part of the stator was the problem? charge coils or maybe pulser coils?
  17. 9

    Little parts that arent around anymore.

    I am trying to think of where this little nylon washer to hold the linkages in place is used and what it looks like . maybe a pic would help me understand. I do have some hole punches and small gasket cutters in my tool box to make things also, they do come in handy
  18. 9

    Yamaha 200 static flush with boat in water

    I would just follow what Yamaha says. just because someone told you different on the web does not mean it has to be done his way
  19. 9

    1989 Yamaha 9.9SF 2 cycle stored for 12 years

    1st thing I would do would be to check compression. no reason to much else if it is not good. compression, spark , timing, and then fuel to air ratio is what is needed to run
  20. 9

    2017 F90 cranks but won’t start

    I guess you are talking about the lift pump that fills the VST. you also need to understand the pump in the VST is cooled and lubed by the fuel running thru it. without fuel in there to pump you could have hurt that motor also running it dry. I also think that water in the fuel itself from the...
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