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S200TXRV Carburetor problem

H

H Henry

New member
My motor is a 1997 model year s200txrv. It sat for over year and the fuel turned bad. I cleaned the tank, lines, filters and such and removed maybe two quarts of water with 40 gallons of fuel I had to repurpose.


Fresh fuel, 90 octane recreational gas, no ethanol added to the fuel tank. Motor started and stopped straight away. I tried a few squeezes on the primer bulb and fuel squirted out the air jet intake on the top carburetor. I thought that the floats were hung up and took it off to find it full of an opaque jell like b b size pellets. I removed the other two carburetors and found similar conditions so I rebuilt all three of them. I also cleaned the two fuel pumps.


I re-installed the carburetors today and the same thing on the top carburetor occured again. Fuel squirts out of the main jet air intake of the carburetor, the other two are fine.


With the carburetor off the motor, I can hold the carburetor upside down to seat the needles and push 20 psi of air from the compressor and no there is no leakage.


I am at a lost as to what causes this and would greatly appreciate any ideas to remedy the situation.


Thank you in advance for any help you can offer.


H, Henry
 
Thanks for the replies. I don't know how to post a photo here, but in the parts schematic in your link they are located under the part marked #27. Two small brass jets about 3/16 diameter. On the intake ace of the carburetor in the bottom schematic an opening is shown above the two butterfly valves, The fuel is comes out of those two places.

With that said, I have given a thorough cleaning to all three carbs and installed three re-build kits. I have further determined that the needle valve(s) are not seating. I have switched valves with the other two carbs, bought two more new ones, tried the old, original failed ones, too. I cleaned and polished the seats as well, all to no avail. The seats are brass but I have not seen them listed for sale anywhere, nor do they look to be readily removable. Float heights are set to the 0.063" +/- 0.02" as specified in my Seloc manual. and the online Yamaha Service manual.

The aluminum carburetor body looks good on all three, so I am skeptical of an internal crack or corrosion. I am at the point of looking for a used, rebuild-able carburetor which can be a challenge. New ones are over $500.00.

Once again, thanks for the help guys.
 
Success! Bottom line is that floats were not seating. First time was the junk build up. Second time was the float height setting. I had taken the carburetor to a marine mechanic and during disassembly he dropped one of the float pins. He opened a new package and replaced both. There was still no joy, same flooding out of the carburetor.

I measured everything with a caliper and found the new float pins to be 0.005" smaller in diameter then the old ones, so I put old ones from one of the other carburetors in and noticed a lot less side to side movement of the floats. I also set the floats to 0.068" above the body rather than the specified 0.063" +/- 0.002". Motor started right up!!! :rolleyes:
 
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