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Old 12-29-2012, 03:54 PM   #1 (permalink)
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05 550 SS Trouble

Hi,

Bought a used sled for my boys for Christmas. Have used sled since Christmas morning with no issues. The previous owner installed the oil line kit fix prior to my purchase and we enjoyed all the snow over the last couple of days.

This mornig son number 2 takes the sled out and after a few passes tells me the unit has little power. Motor sounded liked it fouled a plug (we ride and wrench on KTM 2 stroke dirt bikes). I swapped plugs from cylinder to cyliner and the the one with a the good plug would run. Sent the boys down for some ne BR9ES plugs, installed and the machine will not fire. I am getting spark as I pulled the plugs, grounded them and can see arc.

I have read about flooding and needing to drain the crank. Have owners manual, but is pretty useless. Went online and looked up parts on a microfiche but can not see any crankcase drain plugs.

Help my boys are bumming big time
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Old 12-29-2012, 05:19 PM   #2 (permalink)
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They are in the bottom of the crankcase. You can also remove the spark plugs, hold the throttle wide open and pull it over until dry.
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Old 12-29-2012, 06:17 PM   #3 (permalink)
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Like SEG said. Look below the exhaust Y pipe on the front and at the very bottom of the crankcase. They are small plugs and pretty easy to miss.
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Old 12-29-2012, 08:19 PM   #4 (permalink)
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Thank you both. Found the drain bolts, opened up and drained a bunch of gas out. Machine started up, ran OK briefly then started sounding like it was running only on one cylinder. Probably wet fouled another plug. Getting late, shut off fuel, will get it cleaned out enough to laod up and head for professional help. Thinking one carb is stuck, might as well have them both looked at. Thank you again gnets.
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Old 12-29-2012, 09:49 PM   #5 (permalink)
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It's easy to pull the carbs and open the float bowls. There isn't even any normally replaced parts when you do. You can save some bucks and learn about your machine at the same time. There are several good "how to" threads in the stickys under "Snowmobile how to's". I would check the links out and see if you can convince yourself that it's something you can do yourself.

The problem is likely something in the inlet needle/seat that is not allowing the float to shut the gas off to that carb, so it floods. If the side that is flooding is the same side as the impulse line from the crankcase to the fuel pump, it could also be a rupture in the diaphragm of the fuel pump that is letting raw gas flow into the crankcase. You can rule that out by taking the impulse line off and seeing if you have raw gas in it. If you do, the fuel pump diaphragm has a problem.
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Old 12-30-2012, 07:44 AM   #6 (permalink)
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BC_Dan,

Thank you, will give it a shot.
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Old 12-30-2012, 12:02 PM   #7 (permalink)
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Crazy, went out this morning and the thing fired right up and runs like a champ. Thank you for your support and tips.
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Old 12-30-2012, 07:18 PM   #8 (permalink)
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Awesome!
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