Leaking Carb

kerrismo · March 7th, 2020, 12:55 PM

I have a 2012 250r and just did a carb rebuild kit, I just put it back on with the fuel tank just to find out that I have a leak. After some investigation I found it to be leaking on the left side where the pilot air screw is. It seems to looks slightly different compared to the other side. Can those holes be "bored" to clean them up, or am i missing something that would still be causing a leak?

Thanks

ducatiman · March 7th, 2020, 02:58 PM

Before condemning the pilot screw....be certain that the fuel is not migrating from elsewhere. A rail oring(s), a bowl seal or a failed float valve all need to be eliminated.

This is where a "wet test" on the bench is so valuable in diagnosing, pinpointing and saving R & R time.

DannoXYZ · March 7th, 2020, 02:59 PM

Hi Nick, welcome to Ninjette!

Did your carb rebuild kit come with all new jets and pilot screws?
Did it come with new O-rings, washers and springs for pilot-screws?

Those items really should be replaced when rebuilding. You might be missing spring or O-ring on that one pilot-screw that's leaking. Or parts were re-assemble in wrong order.

March 7th, 2020, 12:55 PM	#1
kerrismo ninjette.org newbie Name: Nick Location: Pennsylvania Join Date: Mar 2020 Motorcycle(s): 2012 Ninja 250r Posts: 6	Leaking Carb I have a 2012 250r and just did a carb rebuild kit, I just put it back on with the fuel tank just to find out that I have a leak. After some investigation I found it to be leaking on the left side where the pilot air screw is. It seems to looks slightly different compared to the other side. Can those holes be "bored" to clean them up, or am i missing something that would still be causing a leak? Thanks

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March 7th, 2020, 02:59 PM	#3
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	Hi Nick, welcome to Ninjette! Did your carb rebuild kit come with all new jets and pilot screws? Did it come with new O-rings, washers and springs for pilot-screws? Those items really should be replaced when rebuilding. You might be missing spring or O-ring on that one pilot-screw that's leaking. Or parts were re-assemble in wrong order.