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  1. Sea Rider

    fuel mileage

    If the max wot rpm range for said motor is 5500 rpm and with a 10 pitch solo boating it's revving at 5400, with a load of 4 up should be dropping wot rpm to the lugging side of 5000 rpm or under. If plan boating constantly with 4 up should prop the motor better to run towards its max wot range...
  2. Sea Rider

    Wayyyy over propped???

    If the tach is right and the motor ir revving at wot with a 19 pitch at just 4800 revs as loaded, it's revving 1500 revs under from its max range, if the +,- 200 RPM loss-gain per pitch rule of thumb would be applied will need to drop 7 pitches to a 12 prop which sounds insane.... Happy Boating
  3. Sea Rider

    gas pouring out of top of carburetor

    It's not just a bit clean, it's completely pristine shinny clean which the second pic doesn't show due to its reduced seat diameter for the lens to fully look inside. The purpose of micropolishing with toothpaste is to smooth out the brass circumference and pointy internals which are microscopic...
  4. Sea Rider

    What Prop on my Yamaha 9.9

    Touche!! but never occured to anyone from that era to go for a prop maximization right after buying an outboard with factory delivered prop. Compared to, now a days you can count with cheap induction tachs, HP spare parts upgrades, many props to choose from and IBoats to help you figure it out...
  5. Sea Rider

    gas pouring out of top of carburetor

    Do you think that after removing all that gunk, crap natural formation from the carb's needle seat, pics of the same carb will remain the same ? pic one stick has a highly polluted/darkened cotton whereas the second pic cotton is completely white, that's achieved after repetitive toothpaste...
  6. Sea Rider

    Installation

    Welcome to IBoats, That info should be stated in the Owner's Manual, a matter to check that out... Happy Boating
  7. Sea Rider

    9.8 hp vs 9.9 hp outboard engines

    Yep, boaters thinks that one decimal point won't make that much difference but in this particular case it's 124 CC more, extra added weight and more money involved... Happy Boating
  8. Sea Rider

    What Prop on my Yamaha 9.9

    Funny that new boaters with small portable motors wants to go for a prop maximization without knowing what the current prop achieves. WOT RPM is all, speed is relative... Happy Boating
  9. Sea Rider

    Cavitation plate

    Why is the boat using a CMC tilt/trim unit and not bolted directly on the transom ? A whale tail, doel fin will add excessive lower leg drag if doesn't ride parallel to the water level when the combo is on plane, other issue, are huge garbage collectors of anything that floats. Happy Boating
  10. Sea Rider

    gas pouring out of top of carburetor

    Typical filthy needle valve seat found after years of use and not running carb dry... pics speak for themselves, carb used to spill fuel through the upper body, now not a drop... Happy Boating
  11. Sea Rider

    Yamaha 15 hp 2stroke stock propeller size?

    Factory delivered props are usually medium pitched, only good for motor break in periods, when done must go for a prop maximization that will make the motor to run to al least middle rpm althouth max rpm range is preferred powering whatever floats and runs on water as loaded. Need to buy and...
  12. Sea Rider

    gas pouring out of top of carburetor

    Check float height if within factory specs and check with a flashlight if the seat is gunked that won't make the needle to sit and close tight into the valve. Happy Boating
  13. Sea Rider

    First Tohatsu motor 9.9HP

    Not familiar with an 9.9B2 motor, if the ohm specs of the 9.9D apply are : Exciter Coil : 168-253 Ohms, Pulser Coil : 30-46 Ohms. Happy Boating
  14. Sea Rider

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

    Water leaks usually occurs at high rpm not at idle or muffs, go for a wot run with removed cowl and visually figure out if the leak comes from the cylinder head, exhaust cover or lower pan gaskets... Happy Boating
  15. Sea Rider

    Solid keel for SIB?

    How many side joiners pieces does the 18 footer sib have per side, the one that locks the Z rails in place ? Can you post some pics of the modified bolted floors to stainless steel tubes to have a look ? Adding a hardened keel to a Sib won't better much the handling on choppy windy water...
  16. Sea Rider

    First Tohatsu motor 9.9HP

    Was the red cord attached to the switch ? If so need to troubleshoot the exciter coil located under the flywheel and the CDI if good or shot... Happy Boating
  17. Sea Rider

    What type of bench seat do I need?

    For better visual clarification.... Happy Boating
  18. Sea Rider

    Solid keel for SIB?

    If you want a solid keel, remove the upper air valve with an extractor tool, once out remove the middle spring and pin unscrewing the small black/grey screw located right in middle of the vertical pin, when done screw the upper air valve back in tight onto the lower valve and fill the...
  19. Sea Rider

    Underpowered Yamaha 9.9

    If the current prop was factory delivered with said motor it's a medium pitched one, only good for breaking in the motor, once done must install a prop that will make the motor to run at least middle to max wot rpm range although the latter it's much preferred pushing whichever the boat size is...
  20. Sea Rider

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

    Must disconnect whatever holds the powerhead to the pan before unbolting the lower pan bolts to lift it out to change the pan's gasket. Both mating surfaces must be immaculate clean specially the surroundings under the lower powerhead where corrosion and piting usually forms there, saltwater is...
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