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Old September 28th, 2013, 07:03 PM   #1
Foxrider64
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Yet another Carb issue

I scoured the forum and google for suggestions of what might help the issue I am having.

Here's the background:
2011 Ninja 250 non FI non CA
3200 miles
Stock air box
Stock air filter
Snorkle intact
Two brothers slip on
Stock jets
Running 93 oct pump fuel

I have run 4 track days on it this year without a single issue.

I took the summer off due to the FL heat. The last time the bike was ridden was in May. I transported the bike from my garage to a friends for storage in July. At that time the bike would not run off choke and would die as soon as the throttle was touched.

I deemed it was clogged pilot jets from sitting.

Last weekend I finally had time to work on it but it had been started about once a week in the time lapsed. I cleaned the carbs thoroughly pulling the needles and jets and soaking in carb cleaner. While I had everything off I decided to pull the snorkle out.

When I reassembled everything the exact same issue was happening.
I cleaned the carbs again amd re-installed the snorkle.
I replaced the spark plugs
Same issue occured except now if I begin to ride with the choke on I can turn the choke off and ride providing I keep the RPMs above 2k.

I can not find a vacuum leak anywhere.

The only way I can get a throttle response is if I block off the snorkle with a shop towel.

I am at a loss. Nothing changed, all things cleaned, doesn't run right.


Any ideas??

I can't find a vacuum leak
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Old September 28th, 2013, 07:26 PM   #2
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Old September 28th, 2013, 07:34 PM   #3
Foxrider64
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Originally Posted by Motofool View Post
That's what I get for waiting to make this post. Someone beat me to it.

I'll pull the idle circuits again and take a look.
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Old September 29th, 2013, 06:17 PM   #4
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Pulled everything apart again.

Orings and washers were intact in the idle circuits.
I'm soaking the jets this time instead of using aerosol carb cleaner and an air compressor.

I'd like to soak the bodies as well but am always hesitant to do that.

If this doesn't work I'm just buying a jet kit and k-n filter and will figure it out from there.
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Old September 30th, 2013, 06:24 AM   #5
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Make sure you manually clean all the tiny holes in the jets and carb. You can't just soak it. Also use some fresh 87 octane gas. 93 is unneccesary.
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Old September 30th, 2013, 06:28 AM   #6
Foxrider64
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Originally Posted by DaBlue1 View Post
Make sure you manually clean all the tiny holes in the jets and carb. You can't just soak it. Also use some fresh 87 octane gas. 93 is unneccesary.

Right, soaking just breaks up the build up, you still need to clean the jets.

I let them soak overnight and then the better part of today. When I get home from work I will poke through them and blow them out.


Any suggestions besides ultrasonic cleaners how to clean the air passages in the body?
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Old September 30th, 2013, 06:44 AM   #7
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Quote:
Originally Posted by Foxrider64 View Post
Right, soaking just breaks up the build up, you still need to clean the jets.

I let them soak overnight and then the better part of today. When I get home from work I will poke through them and blow them out.


Any suggestions besides ultrasonic cleaners how to clean the air passages in the body?
They shouldn't need anything special. High pressure air is always good to blow thought any of the passages in the carb, but you shouldn't have any deposits in the air passages.

Most of the time people look through the jets to see if they are open. If they see light they assume it's fine. That's not good enough. You need to soak the jet and holder in carb cleaner, then use a small copper wire to go through the openings. With the main jet I like to spin the jet around the wire gently, then blow carb cleaner though. The holder has very small holes that also need to be cleaned. Don't use anything too hard inside the jet, as you can damage or alter the tiny venturi.

Last futzed with by jkv45; October 2nd, 2013 at 10:18 AM. Reason: correction
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Old October 2nd, 2013, 09:38 AM   #8
Foxrider64
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I'll admit it- It was the pilot jets not being completely clean. I must have been slacking on my first cleans.

Soaking for 24 hours, aerosol carb cleaner, wire, aerosol carb cleaner, and then compressed air seemed to do the trick.
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