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Old 06-06-2009, 11:10 PM   #1
randomwalk101
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2008 Ninja 250 fuel cut out problem

hey guys,

my 2008 Ninja 250 with a full tank, it runs great. However, when it gets to about 1/2 a tank or so, on a freeway, it looses power after about 5 mins of riding and just dies. It happened to me several times. I had to full over to the feeder, turn everything off, let it sits for a couple of mins, and crank with full chock and it'll gradually comes to live again...then drive for 5 mins or so and it dies again. If I pull up to a gas station and full it up to full (from about 1/2 tank), then it runs fine.

The only mod I did to the line to the carb is put in a big inline fuel filter and took out that little stock fuel filter (locates near the carb). Is it something wrong with the petcock? Is it the fuel filter? What do you guys suggest I would do?? drain the tank & take out the petcock and inspect???
The bike has about 1200 miles on it. Bought it brand new. Warranty expired a week ago :(
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Old 06-06-2009, 11:15 PM   #2
FLYIN'DUC
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Sounds like a venting problem, try opening the gas cap and see if it will start, if so then check the vent line for kinking or clogged
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Old 06-06-2009, 11:21 PM   #3
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Quote:
Originally Posted by FLYIN'DUC View Post
Sounds like a venting problem, try opening the gas cap and see if it will start, if so then check the vent line for kinking or clogged

sounds like the problem one of the members had sometimes ago.
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Old 06-06-2009, 11:36 PM   #4
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I thought it was vent when it died on freeway too so I openned the gas cap and drove...same thing happened.
:(
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Old 06-07-2009, 12:00 AM   #5
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Well in that case I would pull the fuel line off and check for good flow, that should give U a direction to go, petcock or filter if low flow, or inside carbs if good flow, there is lots of bad gas going around now, Flyinninja got $15 worth gas at a shell station and was more than 50% water, and of course the foreigners that run the place said NOT A SINGLE COMPLAINT, she was running low but car ran fine, she got the fuel and start/die start/die, we had to tow it with a wrecker out of the parking lot to the shop
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Old 06-07-2009, 12:07 AM   #6
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May be petcock or filter restricting flow? I don't think it's carb since tank is full, runs fine. If it's carb then does matter if tank is full or not flow will be hindered?
With tank low (1/2 tank), less pressure by weight (gravity feed) causing less flow to carb bc filter restricting it?
Any theory/idea to trouble shoot? Thx.
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Old 06-07-2009, 08:42 AM   #7
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Pull the hose and see
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Old 06-07-2009, 08:49 AM   #8
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it sounds like a venting issue to me also.
we put a zx9r petcock on our race bike
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Old 06-07-2009, 09:24 AM   #9
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Quote:
Originally Posted by markn8442 View Post
it sounds like a venting issue to me also.
we put a zx9r petcock on our race bike
Well as I mentioned in post #4, I thought it was a venting issue so I openned the gas cap and run it with...still dies...can't get anymore venting than gas cap open i thought.
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Old 06-07-2009, 09:53 AM   #10
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Quote:
Originally Posted by markn8442 View Post
it sounds like a venting issue to me also.
we put a zx9r petcock on our race bike
Does the zx9r petcock flows better than the 250's? THanks.
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Old 06-07-2009, 12:03 PM   #11
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Quote:
Originally Posted by randomwalk101 View Post
hey guys,

my 2008 Ninja 250 with a full tank, it runs great. However, when it gets to about 1/2 a tank or so, on a freeway, it looses power after about 5 mins of riding and just dies. It happened to me several times. I had to full over to the feeder, turn everything off, let it sits for a couple of mins, and crank with full chock and it'll gradually comes to live again...then drive for 5 mins or so and it dies again. If I pull up to a gas station and full it up to full (from about 1/2 tank), then it runs fine.

The only mod I did to the line to the carb is put in a big inline fuel filter and took out that little stock fuel filter (locates near the carb). Is it something wrong with the petcock? Is it the fuel filter? What do you guys suggest I would do?? drain the tank & take out the petcock and inspect???
The bike has about 1200 miles on it. Bought it brand new. Warranty expired a week ago :(

I would start with the obvious and throw the stock fuel line and filter back on.
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Old 06-07-2009, 12:28 PM   #12
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+1 buddy put the oem stuff back on
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Old 06-07-2009, 12:32 PM   #13
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Will do
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Old 06-07-2009, 12:51 PM   #14
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Sounds like your fuel line routing is the issue.
Make sure it stays above the float bowls.
if you continue to have issues or have any questions swing by and I'll look at it.
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Old 06-07-2009, 06:33 PM   #15
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Patrick knows what's up if it's not venting it's restricted somewhere along the line
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Old 06-07-2009, 06:36 PM   #16
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Quote:
Originally Posted by Patrick View Post
Sounds like your fuel line routing is the issue.
Make sure it stays above the float bowls.
if you continue to have issues or have any questions swing by and I'll look at it.
Thanks Patrick!!!

This one is in Dallas (my work place). I meant to bring the Honda (in Houston) to you to get suspension tuned in but haven't gotten the time. Need to come in and see you.

Oh btw, the line is above the carb. I will swap out the filter and work from there. I'll keep you all updated.
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