Question about 2004 Suzuki DR-Z 400 E

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400 Eiger ATV, starts and runs fine, stalls the

400 Eiger ATV, (2005) starts and runs fine, stalls the instant you touch the trottle. Carb has been replaced with no improvement. After any ''fix '' new, plug, new Carb seems OK for 10 minutes and gets steadily worse until it will not even move. Playing with the choke will help for a while to get it off idle and moving, sure sounds like a boclked jet but doesn't explain why it runs for a while, or why a new Carb didn't help (after cleaning carb 4 times)
Happened all of a sudden, fine one minute huge hesitation the next, then instant stalling. If you play with idle screw to increase rpm it rev's up. Simptums worse under load, going up hill or pulling something.
Spark looks OK< Does it have a

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  • Anonymous Mar 24, 2014

    Atv starts hard when it is cold, but runs great once started. Is it a compression issue? Like a scored cylinder?

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Valve adjustment time....

Posted on Nov 04, 2010

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If 2 stroke check crank seals, check plug cap for proper resistance,check for good fuel flow to carb.Spark should jump at least a 1/4" gap,NOT JUST the .030 or plug gap.

Posted on Sep 08, 2009

  • Eric Schultz Sep 23, 2009

    Also check for bad gas that has water or junk in it.

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Check the air cleaner and any ductwork for blockage. (Mouse nest?)

Inspect the fuel system. If the fuel line is out of place and too close to the exhaust or cylinder head, the fuel may be boiling inside the line so you don't get proper flow to the carburetor (this is one possible cause of vapor lock).

Is the choke actuator part of the new carburetor? Verify that the choke is opening when the engine warms up. If it is an automatic choke, inspect the vacuum line and thermostat controlling it. Try removing the vacuum line from the choke actuator and plugging it when the engine is warmed up, then see if the engine keeps running. If it does, the actuator diaphragm leaks when the choke is open.

Check the exhaust pipe for blockage.

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If everything else is good, check the exhaust manifold for blockage by carbon deposits.

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