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Old April 2nd, 2021, 12:04 AM   #1
Abeast_9
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Carburetor hoses problem

Hey guys Iím extremely new to motorcycles, and I have no clue what this hose on top of the carburetor is meant to be connected to.

A bit of backstory, I bought a 2011 Kawasaki ninja 250r from someone who buys bikes from auctions. The same way I buy my cars from auctions and fix them. The issue with bike that it had was it only runs with the choke full on. I did a oil change, change the spark plugs, and cleaned the carb, and it made minimal difference. So I accepted defeat and started from scratch again and pulled the carb once again to clean it again. After reading for hours digging in threads from before I was born, I could find nothing on where this hose is meant to go, or a solution for my issue.

Iíve cleaned the carb once again very well, and turned both mixture screws all the way in and then 2.5 turns out. To try to help with the issue about the bike only running with choke on. But I cannot for the love of me find out where this hose is meant to go, so please please please someone enlighten me with ya wisdom, and let me know, Iíll lnclude a picture. I cannot find any accurate diagrams, because all the ones I find are for the California models, and this is not one.

AD46BF71-5FFB-4812-AFCF-727D96F7292A.jpg

67A463F1-7B3A-4D80-8C93-E484C2055609.jpg
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Old April 3rd, 2021, 04:29 AM   #2
slowandlow
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That's a vent that doesn't connect to anything on the open end. It routes back and down to the bottom of the bike.
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Old April 3rd, 2021, 06:03 AM   #3
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if you've plugged the vent hose, obviously remove the plug and allow the hose to breathe

"only runs with the choke full on"

this indicates clogged jets and/or passages
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Old April 3rd, 2021, 06:47 AM   #4
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Welcome to the board, Ab!
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Old April 3rd, 2021, 09:47 AM   #5
Abeast_9
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Quote:
Originally Posted by ducatiman View Post
if you've plugged the vent hose, obviously remove the plug and allow the hose to breathe

"only runs with the choke full on"

this indicates clogged jets and/or passages
thanks for the help with the hose, I didnít have it plugged when it would only run with the choke on, I reset the mixture screws to 2.5 turns, cleaned every jet meticulously with a piece of bristle and put everything back on it. It runs now with the choke slightly engaged after warming up. I increased the idle from the adjustment Bc it was really low and it seemed to help a little bit.

The next question I have is should i increase the air fuel mixture to be able to run with the choke completely off. The screws are currently at 2.5 turns out from all the way in. Or is it something I should do to help, or is the bike supposed to run with choke slightly engaged?
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Old April 3rd, 2021, 10:29 AM   #6
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Cleaning the jets is only a part of cleaning these carburetors. I believe that you won't get it to run right until you've gotten every small passage clean... and there are several.
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Old April 3rd, 2021, 02:35 PM   #7
Abeast_9
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Cleaning the jets is only a part of cleaning these carburetors. I believe that you won't get it to run right until you've gotten every small passage clean... and there are several.
Every passage is pretty clean, the bike only got like 3000 miles on it, it was not terribly dirty at all before I cleaned it. Iím not gonna lie Iím getting pretty fast at dissembling the bike, Iím proud of myself. Only thing I have not done with cleaning the carb, is letting it soak overnight in that cleaner solution like Iíve been seeing in videos. Is this a crucial step? If so I wouldnít mind taking it apart again, because I have to look for a blown fuse or loose connection, electrical been acting up lately.
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Old April 3rd, 2021, 05:08 PM   #8
Triple Jim
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I doubt if that would do much good. You'd be surprised at what it takes to get these carbs truly clean. I've done my own carb work all my life, but when it came time to refurb the ones on my 250 I sent them to Ducatiman, who restored them to new condition. Suddenly it started easier and ran much better, particularly at low throttle. I believe one of the steps he takes involves an ultrasonic cleaner.
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Old April 5th, 2021, 06:05 PM   #9
Runeknight95
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Quote:
Originally Posted by Abeast_9 View Post
Hey guys I’m extremely new to motorcycles, and I have no clue what this hose on top of the carburetor is meant to be connected to.

A bit of backstory, I bought a 2011 Kawasaki ninja 250r from someone who buys bikes from auctions. The same way I buy my cars from auctions and fix them. The issue with bike that it had was it only runs with the choke full on. I did a oil change, change the spark plugs, and cleaned the carb, and it made minimal difference. So I accepted defeat and started from scratch again and pulled the carb once again to clean it again. After reading for hours digging in threads from before I was born, I could find nothing on where this hose is meant to go, or a solution for my issue.

I’ve cleaned the carb once again very well, and turned both mixture screws all the way in and then 2.5 turns out. To try to help with the issue about the bike only running with choke on. But I cannot for the love of me find out where this hose is meant to go, so please please please someone enlighten me with ya wisdom, and let me know, I’ll lnclude a picture. I cannot find any accurate diagrams, because all the ones I find are for the California models, and this is not one.

Attachment 47775

Attachment 47776

Nothing, I have 2 apart right now but I recall it runs past the airbox and goes like under the gas tank bar with the 10mm's on it.
Like 99% sure.

The first time I cleaned these carbs I had to redo it. You should see light down each jet, main and 2ndary when looking through them into a light. Your carb spray should spray through them full power. Run a copper strand from a wire through them to get any gunk out. Spray through all the ports to make sure it squirts out some other end(this is explained in detail in one of the guides) but i just hit every entrance and exit with cleaner.
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