09 Ninja 250r Fuel system problem. Please Help.

TristanFF · May 26th, 2024, 05:41 PM

Okay so, my girlfriend has a 2009 Ninja 250r (EX250F) that she purchased second hand from someone and it was running rough. The lady she got it from said that it was probably a leaking petcock. I have been working on getting this thing running nicely but while I’ve made some significant improvements, it’s still not running how I’d like.

Original Symptoms:
Inconsistent rough idle, slow return to idle when revved, strong smell of gas in the exhaust, when revved it would almost die at first then rev up, engine flooded once,

Fixes/issues found so far:
We checked the petcock and it seems to be operating normally (ie. PRI mode allows fuel to flow freely though, ON mode requires vacuum to send fuel), sprayed carb cleaner around the vacuum lines to check for any indication of a vacuum leak and found nothing, changed the gas out for some new premium fuel, sparks were wet after running and very warn so we changed them out for new ones and figured it’s running too rich. We then pulled the carb cleaned it, also one of the floats had fuel inside it which is probably why it was flooding, changed the floats on both carbs. Then checked the oil and it smelled very strongly of fuel. Figure all that unburned fuel had to go somewhere. We changed the oil and filter and that takes us to where we are at now.

The bike is idling more consistantly but still doesn’t like to rev from idle without a lag, still slow to return to idle (although it’s alot better). Exhaust smells less of fuel but still seems to be running a bit rich.

What else could it be, and carb/choke adjustments that I should be aware of?

Any one had this issue in the past and have any idea how to fix it?

Cheers,

Tristan

Triple Jim · May 26th, 2024, 07:20 PM

Hello Tristan, welcome!

Here's something that might be of use: https://n4mwd.blogspot.com/2013/10/s...-passages.html

Valve adjustment could be part of this too, as could vacuum leaks between the carbs and head.

ducatiman · May 27th, 2024, 07:24 AM

AGREE...have valves EVER been checked on this bike?

Fred659 · May 27th, 2024, 11:24 AM

I would have a look at this part : 16030-1007

https://www.kawasakipartshouse.com/o...rburetor-parts

and make sure that the fuel level is in spec in the bowls.

https://www.motorcycleproject.com/te...at_levels.html

May 26th, 2024, 05:41 PM	#1
TristanFF ninjette.org newbie Name: Tristan Location: Vancouver Join Date: May 2024 Motorcycle(s): 2022 Honda CB500FA, 2009 Kawasaki EX250F Ninja 250r Posts: 1	09 Ninja 250r Fuel system problem. Please Help. Okay so, my girlfriend has a 2009 Ninja 250r (EX250F) that she purchased second hand from someone and it was running rough. The lady she got it from said that it was probably a leaking petcock. I have been working on getting this thing running nicely but while I’ve made some significant improvements, it’s still not running how I’d like. Original Symptoms: Inconsistent rough idle, slow return to idle when revved, strong smell of gas in the exhaust, when revved it would almost die at first then rev up, engine flooded once, Fixes/issues found so far: We checked the petcock and it seems to be operating normally (ie. PRI mode allows fuel to flow freely though, ON mode requires vacuum to send fuel), sprayed carb cleaner around the vacuum lines to check for any indication of a vacuum leak and found nothing, changed the gas out for some new premium fuel, sparks were wet after running and very warn so we changed them out for new ones and figured it’s running too rich. We then pulled the carb cleaned it, also one of the floats had fuel inside it which is probably why it was flooding, changed the floats on both carbs. Then checked the oil and it smelled very strongly of fuel. Figure all that unburned fuel had to go somewhere. We changed the oil and filter and that takes us to where we are at now. The bike is idling more consistantly but still doesn’t like to rev from idle without a lag, still slow to return to idle (although it’s alot better). Exhaust smells less of fuel but still seems to be running a bit rich. What else could it be, and carb/choke adjustments that I should be aware of? Any one had this issue in the past and have any idea how to fix it? Cheers, Tristan

May 27th, 2024, 07:24 AM	#3
ducatiman ninjette.org certified postwhore Name: Gordon Location: new york Join Date: Sep 2009 Motorcycle(s): '95 DUCATI 900SS/SP '07 DUCATI SS800 '19 HONDA CBR650R Posts: A lot. MOTM - Nov '18, Mar '17	AGREE...have valves EVER been checked on this bike? __________________________________________________ gordon@customcarbservices.com Custom Carb Service www.customcarbservices.com

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May 26th, 2024, 07:20 PM	#2
Triple Jim Guy Who Enjoys Riding Name: Jim Location: North Carolina Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot. MOTM - Oct '18, Aug '17, Aug '16	Hello Tristan, welcome! Here's something that might be of use: https://n4mwd.blogspot.com/2013/10/s...-passages.html Valve adjustment could be part of this too, as could vacuum leaks between the carbs and head.

May 27th, 2024, 11:24 AM	#4
Fred659 ninjette.org member Name: Frederic Location: Quebec City Join Date: Jan 2020 Motorcycle(s): 08 Race Prepped ZX-10r, 09 Race Prepped Ninja 250 (300 motor). 74 Norton Commando 850 (Project) Posts: 56	I would have a look at this part : 16030-1007 https://www.kawasakipartshouse.com/o...rburetor-parts and make sure that the fuel level is in spec in the bowls. https://www.motorcycleproject.com/te...at_levels.html