ninjette.org - View Single Post - '04 Idle Air Mixture Screw O-Rings

Aodhfin · July 3rd, 2019, 03:04 PM

Hello! I am working on a friend's '04 250R to help him get it running. The carbs were pretty much gunked up so I've done a through cleaning and rebuild but it's still not dropping down to idle when letting off the throttle. I think I've narrowed it down to the o-rings in the idle air mixture screws being old and deformed so I'd like to replace them. However the only thing I can find is a compete Idle Air Mixture Screw assembly for $15-20 each side. The screws, spring and washer are fine, I'd just like to replace the o-rings if possible.

Does anyone know what the part number is for just the o-rings?

The carbs were cleaned in an ultrasonic machine, all the passages were blown out with shop compressed air, passages confirmed clear with carb cleaner blown through them, boots on both air-box side and head side properly seated with no known vacuum leaks. Valve adjustment is in progress but I'm pretty sure it's an idle air mixture issue - though any additional thoughts would be appreciated!
Thanks!

July 3rd, 2019, 03:04 PM	#1
Aodhfin ninjette.org newbie Name: Scott Location: Cincinnati, OH Join Date: Jul 2019 Motorcycle(s): None yet Posts: 7	'04 Idle Air Mixture Screw O-Rings Hello! I am working on a friend's '04 250R to help him get it running. The carbs were pretty much gunked up so I've done a through cleaning and rebuild but it's still not dropping down to idle when letting off the throttle. I think I've narrowed it down to the o-rings in the idle air mixture screws being old and deformed so I'd like to replace them. However the only thing I can find is a compete Idle Air Mixture Screw assembly for $15-20 each side. The screws, spring and washer are fine, I'd just like to replace the o-rings if possible. Does anyone know what the part number is for just the o-rings? The carbs were cleaned in an ultrasonic machine, all the passages were blown out with shop compressed air, passages confirmed clear with carb cleaner blown through them, boots on both air-box side and head side properly seated with no known vacuum leaks. Valve adjustment is in progress but I'm pretty sure it's an idle air mixture issue - though any additional thoughts would be appreciated! Thanks!