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Old 05-26-2013, 03:59 PM   #1
viper15
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Bike won't start after carb clean

The motorcycle has been sitting in my garage with an empty fuel tank for the past 6 months. However, although it does crank, it doesn't actually start. Yesterday, I replaced the battery, replaced the spark plugs, cleaned the carburetors, and put a little under a gallon of fresh gas with Seafoam in the tank.

The fuel line from gas tank to carb is clean, the fuel filter is clean, all of the tubes are clean with proper airflow. The spark plugs create sparks when I tested them, and the battery is fully charged.

After all of this, the bike still cranks but doesn't start. Any ideas would be greatly appreciated. Thank you.
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Old 05-26-2013, 04:01 PM   #2
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PS: Bike is a 2008 Kawasaki Ninja 250r
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Old 05-26-2013, 04:15 PM   #3
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Does this year have a petcock? If so, did you double check the position? Also, Rod said that he had a bike once where the turned but not the valve because it had been sitting so long. He had to replace the petcock.

Also, check all safety switches. (kick stand, tip over sensor, clutch, etc)
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Old 05-26-2013, 05:29 PM   #4
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How did you clean the carbs? Did you drain the fuel out of the bowls when it was stored? Any minute dirt or gumming will make it hard to start. You'll need to clean the orifices out with a thin wire.
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Old 05-26-2013, 05:42 PM   #5
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Quote:
Originally Posted by cuong-nutz View Post
How did you clean the carbs? Did you drain the fuel out of the bowls when it was stored? Any minute dirt or gumming will make it hard to start. You'll need to clean the orifices out with a thin wire.
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Old 05-26-2013, 05:48 PM   #6
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Old 05-26-2013, 08:01 PM   #7
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Cleaning carbs takes attention to detail and patience.
Half of what we did back when I was a motorcycle mechanic was clean carbs after the owner "cleaned"them, lol.
If you don't have a manual try googling and find a breakdown of your carbs. Find the pilot or idle jet. The orifice in it is super small, you can barely see light thru it, make sure that it is clean.
Not just squirt cleaner thru it clean but really clean.

Once you get that done most of your problem will be solved.
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Old 05-26-2013, 08:02 PM   #8
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Of course, all you mixture settings need to be close as well. Make sure the plugs are gapped correctly and clean too.
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Old 05-26-2013, 09:25 PM   #9
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Quote:
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Of course, all you mixture settings need to be close as well. Make sure the plugs are gapped correctly and clean too.
Yep Bumblebee got it spot on with the jet orfices are stupid small and will cuase these issues im constantly rebuilding the ninja 250 carbs i work for a msf school.
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Old 05-30-2013, 09:06 PM   #10
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You could try a shot of engine spray engine starting fluid just to see if it will fire for a second.

Is the air cleaner on the bike if not put it on it may need the low pressure created when the air cleaner is in place to draw the fuel up into the carb throat through the jets - unless it has fuel squirt / shot system (Monkey ) or whatever there called.
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Old 05-30-2013, 09:11 PM   #11
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Your carb isn't clean as has already been said.
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Old 05-30-2013, 09:12 PM   #12
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Spray some carb cleaner directly into the carb while trying to start it. If it runs, chances are your carbs are in need of more cleaning or something may not have been put back correctly. Did it run perfectly fine prior to parking it for the 6 months?
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Old 05-30-2013, 09:32 PM   #13
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Give it to me and I'll clean it for you. I'll even walk you through it.
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Old 05-30-2013, 09:55 PM   #14
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Quote:
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Give it to me and I'll clean it for you. I'll even walk you through it.
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Old 05-31-2013, 08:32 AM   #15
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Pilot jets are crazy small. Running wire through them doesn't always do the job. Either buy a proper tool to ream them or just buy new jets. They're only a few bucks each.

Here's the tool I mentioned. Got it on sale for $6

31kuUvArENL SY300

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