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Old January 10th, 2022, 12:46 PM   #1
ColoradoCal
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Name: Calvin
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Carb woes (hydrolocking on fuel)

I've been lurking around for a bit now, I picked up a 1 owner 2012 Ninja 250 with 27k miles at the end of October. The owner said it had been sitting for about 9 months or so. When purchasing, I was able to jump it and get it briefly running with the choke on.

It sat for a bit after I got it, and I finally got around to getting a fresh battery for it. Filled it up with fresh fuel, and barely got it running with the choke again. After it died a few times, I let it sit and tried again only to get hydrolock symptoms, and fuel dumping out of the overflow hose. I pulled the spark plugs and turned it over to get the fuel out of the cylinders. I decided I needed to dive a little deeper into this, and started the teardown. I noted that the fuel selector on the tank was on PRI not ON. I tried carb cleaner, and got the same results. I picked up an ultrasonic cleaner and ran the carb in that, did a rough bench test with fuel still pouring out of the overflow hose.

What am I missing here? I've seen quite a few recommendations to send carbs to @ducatiman for a rebuild, would he be able to do more than I can?

As a side note, I don't think it is the petcock, now that I have it in the ON position it holds fuel. I don't know why the float needles wouldn't be working correctly.
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Old January 10th, 2022, 03:01 PM   #2
ducatiman
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Old January 10th, 2022, 03:07 PM   #3
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I had same problems on a 2008 Ninja 250. Ended up snapping teeth off starter gear due to hydrolocking. You need to replace float-valves and/or also milling valve seat. I spent 40-hrs refurbishing my carbs and they were only 90% restored. Sent them to ducatiman and they came back perfect!
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Old January 10th, 2022, 03:31 PM   #4
ColoradoCal
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Quote:
Originally Posted by DannoXYZ View Post
I had same problems on a 2008 Ninja 250. Ended up snapping teeth off starter gear due to hydrolocking. You need to replace float-valves and/or also milling valve seat. I spent 40-hrs refurbishing my carbs and they were only 90% restored. Sent them to ducatiman and they came back perfect!
That is reassuring to hear...from looking at many past posts all I have seen are positive reviews. With the mileage and bike condition, I wouldn't be surprised if I need the same treatment. Once I hydrolocked the second time, I got worried about the teeth. Still sounds ok turning over, so fingers crossed I think that the teeth are still ok. Thanks for the input.
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Old January 10th, 2022, 03:31 PM   #5
ColoradoCal
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Originally Posted by ducatiman View Post
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Old January 10th, 2022, 09:00 PM   #6
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Welcome!

My husband had a bike that had sat for a while. Carb problems, of course. We took it to a shop, and they "cleaned" the carbs repeatedly, but without success. Still wouldn't run. We found a guy like ducatiman, and once we sent that guy the carb, it came back working nicely. Even the pros mess it up. Stick to someone who knows carbs.
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Old January 25th, 2022, 05:34 PM   #7
ColoradoCal
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Update! Thanks for the inputs everybody! I ended up pulling them off and sending them to ducatiman, got them back last weekend. Very clean refurbishing and I appreciate the updates from Gordon along the way. Getting around to reassembling the bike, fresh oil change and it started up first bump! Very exciting, first ride is coming up soon.
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