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Old July 9th, 2024, 07:06 PM   #1
Nbuck7
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Name: Noah
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White smoke from exhaust+dying after a few seconds

Hey everyone,
After cleaning the carbs and adjusting floats, replacing head gasket and adjusting valves, my 2008 Ninja 250 was finally starting and running fairly well. I had taken it for a 5-minute drive around the neighborhood and it was doing pretty good, idling strong and going fast. Then when I came to a stop it died and I couldn't get it to run after that. It would start up, idle for a couple seconds, then die. Maybe engine is getting flooded with gas somehow?

In addition to this, white smoke is coming from the exhaust. This is why I had replaced the head gasket, although when I took the engine apart the gasket was fully intact.

Any ideas?

Thanks.
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Old July 10th, 2024, 04:57 AM   #2
Triple Jim
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What's the crankcase oil look like?
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Old July 11th, 2024, 09:02 AM   #3
Nbuck7
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Just drained some oil out and it smells like gas. Also the oil level has risen significantly. Confirms that suspicion. Can anything other than malfunctioning float valves cause too much gas to go into cylinders?
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Old July 11th, 2024, 11:11 AM   #4
Triple Jim
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It takes two things to get fuel into the crankcase when the engine is not running:

1. A leaking petcock
2. Leaking float valves

The tendency to stall when riding adds more evidence of leaking float valves.

I assume you looked at the oil and it's not milky like it would be if coolant were getting into it.
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