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Old 11-24-2012, 10:34 AM   #1 (permalink)
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Default 2008 Ninja 250r, throwing fuel through carbs ...

Hello,

After a long time, i revuilt my 2008 ninja 250r bike ... only cosmetics scratches.

Now, i just replaces the airfilter for the K&N one, and left it on my bike mech shop ...

Bike feels stronger after 4k rpm's, but in lower rpm's after 15 minutes or so, it start to get richer and richer and man, is throwing LOTS of fuel through the carbs, at the level of even left my rear brake disk wet with fuel ...

What can be happening ?, at the mech shop they tried to do something but no real solution ...

thanks ...

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Old 11-24-2012, 11:06 AM   #2 (permalink)
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Most likely the fuel in the carbs evaporated, and because it was not stabilized with Seafoam or Stabil it left a deposit behind that is now clogging one or both float valves (float needles), so that one or both float bowls are overfilling.

I would start with cleaning the carbs.

Some photos and explanation are in the link below- I used some aluminum polish on the Q-tip to polish the valve seat for my cruiser, during rejetting for a new intake and exhaust changes. You may want to add a low-cost lawnmower fuel filter to keep the carbs cleaner in the future:

Carb Float Needle causing fuel leakage into the engine cases.
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