All the tutorial videos and hype make carb cleaning seem harder than it really is, and ninja 250 carbs are as simple as they come. Go slow, refer to your manual's diagram, and take pictures if you want to be extra careful. I cleaned '05 ninja 250 carbs last november and it took less than two hours, start to finish. I have a 97 Ninja EX250, and I am having a problem with one of my carbs. The bike is hard to start. If I choke it, it pops a little bit but never catches. If I take choke off, it pops a little more, but still doesn't catch. I have to hold the throttle about a third of the way open and crank for about 15-20 seconds to get it running. You can either add about three ounces of a clear carburetor cleaner like Berryman B12, GumOut or STP to a full tank of gas and ride the bike hoping the carb cleaner will flush out the gum and varnish, or you can drain the carbs by opening the float bowl drain screw, then refilling the carbs through the fuel hose. 2. clean the fuel flow hose all the way through the fuel flow needle inside the carb. (get all the little rubber residue out of there) 3. insure your gas cap and over flow tube off the gas cap can vent freely. If that is clogged pressure can build up and force the fuel flow needle to open allowing the gas to come out the overflow tube on the 1986 - 2007 Ninja 250R Tech Talk: 5: June 14th, 2013 09:38 PM: First Carb Cleaning: Achilles: 2008 - 2012 Ninja 250R Tech Talk: 33: February 1st, 2013 11:48 PM: Carb Cleaning?? jboyd12: General Motorcycling Discussion: 11: March 3rd, 2012 10:05 AM: 08 dies on idle now, is the carb cleaning covered in warranty? novak2k9: 2008 - 2012 Ninja 250R I have a 2007 ninja 250r, has a brand new carburetor in it. Iā€™ve checked around for leaks with starter fluid and no change in rpmā€™s. Iā€™ve adjusted the idle screws from top to bottom and it still holds a high rev at about 4k. Thanks for posting in r/Fixxit, the motorcycle repair subreddit. If you forgot to put the Make, Model and Year in YSCT.

ninja 250 carburetor problems