Question about 2003 Yamaha YZF 600 R thunder cat

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Clog carb I think the low speed part or the carb is gummed up.  The bike does not idle without the choke on.  It will stall if you don't have 2k on the tach.  Will gum out or similar product work if added to the gas tank?

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Better to strip the carbs and make sure the pilot jets are clear, i dont like using 'cleaners' in the tank.

Posted on Jun 17, 2009

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Same problem with my '02 after sitting for a winter. Run the bike for a minute then feel the pipes, the hot ones are OK, the cooler one in the cylinder with the problem. Take off the tank and loosen the drain valves on the carbs. Squirt carb cleaner into the drain, either with a hose or large hypo needle on the end or the plastic tube that comes with the cleaner. Shoot a lot in, enough to fill the bowl. Tighten the drain and let it sit for a day then it should be OK.

Posted on Apr 10, 2010

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Run down to Autozone/Pepboys and pick up a can of seafoam...

Probably one of the best fuel system cleaners on the market... If seafoam won't clean it up..then pretty much I doubt anything will other than pulling the carbs off..

Posted on Jun 20, 2009

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1 Answer

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1. Fuel cap or fuel tank is not venting properly.

2. Fuel filter clogged.

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8. Air/fuel mixture screw set too lean.

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8. Air/fuel mixture ***** set too lean.
9. Idle port, transfer ports, slow air jet clogged.
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9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
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5. Float needle and seat sticking.
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7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
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