Hi guys! I need some help... - Kawasaki Ninja 250R Forum
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post #1 of 4 (permalink) Old 06-25-2013, 06:20 AM Thread Starter
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Location: Lancaster, PA
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Hi guys! I need some help...

So I am new to here but not quite new to bikes and I need a little help on a project that I am working on. I recently picked up a 2000 Ninja 250 off craigslist. The bike wasn't running so I took it home, replaced the spark plugs, put in some fresh gas and charged the battery. I was able to get the bike to turn over and even run fro brief periods of time but every time it would run or turn over gas would pour out of the carbs. At first I thought this was a carb problem so I cleaned them out, paying close attention to the floats, needles, seats, etc. This did not fix the problem so I ended up buying a set of carbs off a running bike for cheap just to make sure that they aren't the issue. These carbs don't work either so I decided to check the petcock. That ended up having a vacuum problem so when I sucked on the vacuum hose gas would start pouring out but it wouldn't stop when I stopped sucking. I replaced it thinking that would solve my problem but it hasn't. Upon closer inspection gas appears to be coming out of the intake manifolds and whenever I remove the carbs it pours out so I am wondering if I could have some sort of vacuum/compression problem? any tips would be greatly appreciated!
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post #2 of 4 (permalink) Old 06-25-2013, 08:17 AM
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Location: NC
Posts: 478
Is this what you got?


Reversion is the flow of the air fuel mixture out of the cylinder and into back into the intake manifold. Reversion happens even on a stock engine because the piston is moving up the cylinder before the intake valve closes. This is usually a sign of a needed valve adjustment
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post #3 of 4 (permalink) Old 06-25-2013, 01:26 PM Thread Starter
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I wondered about that but I don't have any fuel in my air box. I feel like I have the opposite problem and the motor is sucking too much fuel into the cylinders to the point that it runs out of the intake manifold and floods out the engine. I am going to do a valve job and see if that does anything.
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post #4 of 4 (permalink) Old 07-07-2013, 04:56 PM Thread Starter
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Alright well I finally got a free moment and adjusted the valves and ended up retiming the bike and that has solved the fuel leakage problem. I hate to be the guy that joins the forum just to ask questions constantly but now I am really stumped. As far as I can tell I have the fuel system working as it should but the bike refuses to start. I have good compression, good spark, and proper fuel flow. The thing that is really confusing me though is that if I remove the spark plug from the left cylinder the bike will fire up and idle no problem. Like I said, I hate to be the guy asking tons of questions but I have been working on bike for years now and never seen anything like this before.
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