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Fixit · November 23rd, 2019, 02:23 PM

I know there is a VAST AMOUNT of threads dealing with this, unfortunately there is a vast amount of data both valuable and worthless. So many contain arguing and other useless stuff.

This is the situation:
I purchased a 2005 ex250 that "only needs the carbs cleaned real quick".
Turns out the gas was rotten, the carbs were gunked up, the oil filter was installed all out of order and one of the screws went through the gas tank. Anything else, oh yeah most of the electrical connections were corroded, the engine oil was at least half gasoline.

So after much cleaning, grumbling and cussing it runs. Well, sort of. Way too rich. After removing the carbs yet again and cleaning yet again it still is way too rich and won't idle at anything less than 2000.

If the air/fuel screws are completely closed it still runs at idle and still way too rich. The carbs have been opened and cleaned so many times I can do it blindfolded. There seems to be nothing physically wrong or out of place.

Borrowed a set of virginal unmolested carbs from a 2009 and looked in the bowls, a leaner main jet but the same mid range jet were installed. The idle air/fuel jets are still plugged from the factory. So I installed them. Bike started fine, Revs fine, but too rich. The idle is still way too high as well.

The plugs were originally way dirty due to being way too rich and having stuck floats. They look just a little too rich now.

I was hoping that since these carbs were unmolested that it would help. Unfortunately it did not.

I am new to the ninja, but not new to bikes or cars at all. I am also assisted by a master ASE technician with decades of experience. We are both stumped. I just recently did the exact same thing to my Harley that sat with gas in it for 7 years, and got it running easily. This ninja has not sat that long at all.

Any help would be much appreciated. Thank you.

November 23rd, 2019, 02:23 PM	#1
Fixit ninjette.org member Name: Michael Location: California Join Date: Nov 2019 Motorcycle(s): Harley XL1200C, Kawasaki ex250 Posts: 31	Running too rich.. I know there is a VAST AMOUNT of threads dealing with this, unfortunately there is a vast amount of data both valuable and worthless. So many contain arguing and other useless stuff. This is the situation: I purchased a 2005 ex250 that "only needs the carbs cleaned real quick". Turns out the gas was rotten, the carbs were gunked up, the oil filter was installed all out of order and one of the screws went through the gas tank. Anything else, oh yeah most of the electrical connections were corroded, the engine oil was at least half gasoline. So after much cleaning, grumbling and cussing it runs. Well, sort of. Way too rich. After removing the carbs yet again and cleaning yet again it still is way too rich and won't idle at anything less than 2000. If the air/fuel screws are completely closed it still runs at idle and still way too rich. The carbs have been opened and cleaned so many times I can do it blindfolded. There seems to be nothing physically wrong or out of place. Borrowed a set of virginal unmolested carbs from a 2009 and looked in the bowls, a leaner main jet but the same mid range jet were installed. The idle air/fuel jets are still plugged from the factory. So I installed them. Bike started fine, Revs fine, but too rich. The idle is still way too high as well. The plugs were originally way dirty due to being way too rich and having stuck floats. They look just a little too rich now. I was hoping that since these carbs were unmolested that it would help. Unfortunately it did not. I am new to the ninja, but not new to bikes or cars at all. I am also assisted by a master ASE technician with decades of experience. We are both stumped. I just recently did the exact same thing to my Harley that sat with gas in it for 7 years, and got it running easily. This ninja has not sat that long at all. Any help would be much appreciated. Thank you.