Carb Float Problem

Trainsk8 · June 3rd, 2012, 12:44 PM

I have a feeling that i fiddled with the carb a little too much... a couple weeks ago i tried lowering the floats just a bit the lean out the low revs so the engine wouldn't bog down as much. but then the whole bike ran very lean and partial throttle was non exixtent. Then today i had time and tried raising the floats to richen the fuel mixture. After 3-4 times of ripping the carb out and raising the floats the bike still stumbles to get going and partial throttle doesn't work very well. i even tried adjusting the fuel mixture screws but it still does the same thing. Can anyone help me?

Kygirl · June 3rd, 2012, 01:27 PM

Like a lot of people on this forum I've jetted, shimmed, adjusted my mixture screws, and synchronized my carbs several times. However, I've never adjusted my ninja from the stock float heights. So I can't offer much advice. =( Is your bike already jetted/shimmed/etc. and the float adjustment was a final thing to perfect it? If so sounds like a carb sync is a good idea. You've probably already done that, but if not it might help a bit. Hopefully someone will jump in soon and offer some good advice!

Motofool · June 3rd, 2012, 03:52 PM

Have you measured the height that the fuel reaches inside the bowls?

There is a narrow specification for that (+-2 mm I believe), which is hard to reach just by guessing.

Trainsk8 · June 4th, 2012, 12:31 PM

yeah the bike's been fully jetted with a factory pro kit, and i just had the valves adjusted, and had the carbs synced the other day hoping that it would help. i did measure the float height

June 3rd, 2012, 12:44 PM	#1
Trainsk8 ninjette.org member Name: Brady Location: Marysville, OH Join Date: Aug 2010 Motorcycle(s): 2010 Kawasaki Ninja 250R Posts: 28	Carb Float Problem I have a feeling that i fiddled with the carb a little too much... a couple weeks ago i tried lowering the floats just a bit the lean out the low revs so the engine wouldn't bog down as much. but then the whole bike ran very lean and partial throttle was non exixtent. Then today i had time and tried raising the floats to richen the fuel mixture. After 3-4 times of ripping the carb out and raising the floats the bike still stumbles to get going and partial throttle doesn't work very well. i even tried adjusting the fuel mixture screws but it still does the same thing. Can anyone help me?

June 3rd, 2012, 03:52 PM	#3
Motofool Daily Ninjette rider Name: Hernan Location: Florida Join Date: Mar 2011 Motorcycle(s): 2007 Ninja 250 Posts: A lot. MOTY - 2016, MOTM - Dec '12, Jan '14, Jan '15, May '16	Have you measured the height that the fuel reaches inside the bowls? There is a narrow specification for that (+-2 mm I believe), which is hard to reach just by guessing. __________________________________________________ *Motofool* *.................................Never ride faster than your guardian angel can fly* "Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí

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June 3rd, 2012, 01:27 PM	#2
Kygirl ninjette.org member Name: Sarah Location: Kentucky Join Date: Apr 2012 Motorcycle(s): 2008 ninja 250R 1979 SuzukiGS425E Posts: 94	Like a lot of people on this forum I've jetted, shimmed, adjusted my mixture screws, and synchronized my carbs several times. However, I've never adjusted my ninja from the stock float heights. So I can't offer much advice. =( Is your bike already jetted/shimmed/etc. and the float adjustment was a final thing to perfect it? If so sounds like a carb sync is a good idea. You've probably already done that, but if not it might help a bit. Hopefully someone will jump in soon and offer some good advice!

June 4th, 2012, 12:31 PM	#4
Trainsk8 ninjette.org member Name: Brady Location: Marysville, OH Join Date: Aug 2010 Motorcycle(s): 2010 Kawasaki Ninja 250R Posts: 28	yeah the bike's been fully jetted with a factory pro kit, and i just had the valves adjusted, and had the carbs synced the other day hoping that it would help. i did measure the float height