dual carb ques?

[wingerdor]

I bought a 250 ninja for my training site and it idles up with the choke off, but idles down and stalls out with the choke on. The bike did sit for a while. I ran the carbs out of gas before I took them out. After taking them out, the one is dirty and when I flipped it over it dumped gas out (just the dirty carb) I have sprayed the hell out of both sides with cleaner and gotten some gunk out of the one that had gas still in it. Anything specific I should check before I put it back together. I have only ever messed minimally with single carbs.
I hate the idea of putting it back together and having the same problems.
Thanks!

I love FI'd bikes!

[OreoGaborio]

You didn't say it, but I assume you pulled the jets out & let them soak in carb cleaner?

Check the needle valves as well. Doesn't take much to make em stick.

[ultraTwist]

If you have it apart yake the jets and soak them. Then blow air throught them, you can get a nozzel with a rubber tip. Better yet just order new ones since you have them apart, they cost about 3.50 each. Next year drain the carbs instead of letting the gas burn out, that still leaves gas in the bowls.

[Sheppo]

Don't just trust compressed air to clean your jets. I run a wire through each one. Then spray carb cleaner to assure I can see the are open. The same with the choke circuit.

[ultraTwist]

Yep, you could also get jet cleaning wire. Hold them up to the light and look through when you are done, make sure all the holes are clear.

Don't just trust compressed air to clean your jets. I run a wire through each one. Then spray carb cleaner to assure I can see the are open. The same with the choke circuit.

[The Crashing Tomato]

I had the same problem with my wifey's bike 2001 ninja 250. yeah the jets the jets the jets ......... on the side of the carb is a white plastic circle with two screws holding it. under that cover is a diaphragm with a spring return so be ready to catch it.

there are two things to do here with carb clean and compressed air.

1. the cover has a small pollup with an air passage towards the diaphragm that needs to be cleaned and blown
2. the diaphragm holds a metal penis type thingy that needs to be cleaned and blown also
3. take the bowl off and clean the jets
4. satating the obvious here but you did change out the gas in the tank ... right?
5. you don't have to separate the carbs to do this op.

[kbroderick]

Haven't cleaned 'em yet, but I'd check out Cleaning the carbs 1 - Ninja250Wiki and Cleaning the carbs 2 - Ninja250Wiki for detailed instructions.

[TLRMan]

Don't just trust compressed air to clean your jets. I run a wire through each one. Then spray carb cleaner to assure I can see the are open. The same with the choke circuit.

+1
just carb cleaner, and a blast of air, will not break up the crap that solidifies in the jets.

[gs500fast]

did you say ninja 250?

Is there a carb sync tool? - Ninja250Wiki

I never synced my carbs after taking them apart and the bike runs fine. still, something you might want to do thats specific to dual carbs

[TLRMan]

did you say ninja 250?

Is there a carb sync tool? - Ninja250Wiki

I never synced my carbs after taking them apart and the bike runs fine. still, something you might want to do thats specific to dual carbs

Not doing that is like taking a dump, and not wiping yer ass with any multi cylinder engine. I've never found any to be spot on, and this is even from the factory. This is why my tunes ROCK!....

[Sheppo]

Not doing that is like taking a dump, and not wiping yer ass with any multi cyclider engine. I've never found any to be spot on, and this is even from the factory. This is why my tunes ROCK!....

+1 I always synch multi carbs..

[gs500fast]

Not doing that is like taking a dump, and not wiping yer ass with any multi cyclider engine. I've never found any to be spot on, and this is even from the factory. This is why my tunes ROCK!....

good to know. I didn't think it was essential to the process but I was good and newb when I did the carb rebuild. guess I know what I'll be doing this weekend.

cool.

[greenmonster]

Not doing that is like taking a dump, and not wiping yer ass with any multi cylinder engine. I've never found any to be spot on, and this is even from the factory. This is why my tunes ROCK!....

True that!

[wingerdor]

Wow, Thanks for all the great info. Will re-tackle them tonight.

[wingerdor]

Well, I cleaned it all out with cleaner, soak, wire, air pressure. spottless. drained the tank out and sloshed it around to get any crap out. put it together, put gas in it started it, warmed it up tweeked the idle. (Couldn't sync the carbs yet. no tool, shop to busy) Took it for a spin and it was running fine. wound it up in 1st gear and just before it redlined it stalled and won't restart! ARGH!! I let it sit and still nothing.
Help...

[OreoGaborio]

Sounds like fuel starvation or something... ya hook up the fuel lines the right way? Petcock on & all that jazz?

[wingerdor]

When ever it starts to die, if I take the vacuum line off the fuel valve it revs right up so it's air hungry. I took the petcock diaphragm out and it doesn't look great. Is there another way to adjust air. Could I have f'd up the vaccum pistons?