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Help Me Fix It A great place to post any problems you may be having while working on your motorcycle. Most of us are do-it-yourselfers so this is a great way to share any information pertaining to fixing something or adding something on.

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Old 07-09-2007, 02:49 PM   1 links from elsewhere to this Post. Click to view. #1 (permalink)
GoIllini
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Default Ninja 250 turns over but won't start.

Hello all.

My Ninja 250's been in storage for the past three weeks, and I've been trying to get it started to no avail.

When I press the starter button, the motor turns over, but the bike isn't starting.

I've checked the spark plugs; they're working. (I couldn't see the spark, but I'm pretty sure I got a 12 V jolt.)

I sprayed starter fluid (ether) just behind the air filter; that didn't get it to start.

The exhaust is pumping out air when the engine turns over, so that's not the problem.

Is there something I'm missing? I'm starting the bike in neutral with the kickstand down. The choke has varied from being on to off, and I've usually had the throttle open about halfway when I tried to start.

How do I check the carburetors? I think they have a bowl or something like that that's supposed to be 2/3 full when I try to start the bike? Is there any set of instructions for getting to the carburetors on a ninja 250?

Thanks.
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Old 07-09-2007, 04:35 PM   #2 (permalink)
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Update:

Per the recommendations on Ninja250.org, I drained the carburetor float bowls. The gas had turned a yellowish/amber color, so I figured that it couldn't have hurt.

When I tried starting the bike, it turned over for about five seconds and then suddenly hit 7k RPM. At that point, I backed off, and the bike stopped.

Is this a problem with the carburetors?
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Old 07-09-2007, 04:50 PM   #3 (permalink)
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Was the bike running good before you put it in storage? Was it run often?

3 weeks of sitting usually won't make the fuel go bad. So if you have good fuel, I would pull the spark plugs. There is a good chance they are fouled out.

If new plugs doesn't get it going rather quickly, it might be time to buy a can of Gum-Out and clean those carbs.

Is the battery fully charged?
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Old 07-09-2007, 04:56 PM   #4 (permalink)
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Quote:
Originally Posted by 2001FZ1
Was the bike running good before you put it in storage? Was it run often?

3 weeks of sitting usually won't make the fuel go bad. So if you have good fuel, I would pull the spark plugs. There is a good chance they are fouled out.

If new plugs doesn't get it going rather quickly, it might be time to buy a can of Gum-Out and clean those carbs.

Is the battery fully charged?
Thanks for helping me with this.

The bike was running just fine before I put it into storage; I was riding it several times a week. OK, I felt myself adjusting the idle a little higher, so maybe the carburetors are getting some build-up.

The battery was charged when I started off, but now it's dead. I tried starting it with my car battery a few more times after that.
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Old 07-09-2007, 04:59 PM   #5 (permalink)
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Quote:
Originally Posted by 2001FZ1
Was the bike running good before you put it in storage? Was it run often?

3 weeks of sitting usually won't make the fuel go bad. So if you have good fuel, I would pull the spark plugs. There is a good chance they are fouled out.

If new plugs doesn't get it going rather quickly, it might be time to buy a can of Gum-Out and clean those carbs.

Is the battery fully charged?
+1
a low battery will crank the bike but be just too slow for it to start.
especially a carbed bike that relies on the fast rush of air to propperly atomize the fuel.
I say, replace the plugs, charge the battery, spritz the intake with a bit of ether and crank away.
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Old 07-09-2007, 07:14 PM   #6 (permalink)
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Just because power is going to the spark plugs doesn't mean that they're sparking. I HIGHLY doubt that the carb would just get clogged like that. On my dirtbikes, I have yet to have a clogged jet/carb. They have sat for as long as 8 weeks before with me doing absolutely nothing to it. I wouldn't even drain the fuel out but it would crank right up.
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Old 07-09-2007, 09:08 PM   #7 (permalink)
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Suprisingly enough, it seemed like it may have been a carburetor problem. I sprayed some ether into the air intake, fired up the bike, and *finally* the bike started running. I'm going to put some carburetor cleaner in, just for good measure.

However, it may have also been a battery problem; I connected my car battery to my bike battery for about 15 minutes when the battery started to sound a little weak. (Yes, the car was turned off. Anyone who stumbles on this thread should be warned that several people I met strongly recommend against running the car engine while connected to bike.)
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Old 03-13-2009, 07:34 PM   #8 (permalink)
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what did you do to the carb.....i have the same problem
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Old 03-15-2009, 10:36 PM   #9 (permalink)
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Hey! i had the same problem today. and still have it =(
my battery also got weak after 15 mins of trying to start it so i had to jump start with my car. and i did so with the car engine on. is there a reason to have it off? and will it still charge my bike battery with the car engine off?

anyway, where do u guys get ether, and where is the air intake? im a total newb with bikes and do not know where or what anything is. where do i get ether?
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Old 03-15-2009, 10:41 PM   #10 (permalink)
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I was told by the guy I bought my bike from you shouldn't charge it with your car cuz the voltages are different or something?

It will charge fine with the car off. It's a little slower and you risk running down your car battery sooner or later, but it charges fine.
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Old 03-16-2009, 01:41 AM   #11 (permalink)
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i have tried to start the bike with starter fluid and it would fire up for a sec and then turn off.......i have checked fuel and spark plugs.... i am going to clean the carb but if any one else has any clue what else it could be please let me know
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Old 03-16-2009, 09:09 AM   #12 (permalink)
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I recently bought a used 89 250 that had sat for most of the past year and wasn't starting. I poured a bit more than half of a can of Seafoam into a 1/4 full tank. I cranked it for about 3-5 minutes (not continuous) before it finally started. I was barely running at that point. I let it set for 15 minutes then tried again and it ran a bit better. Ran through the "start - sit 15" a few more times and I was able to run it to full RPMs. Now if I can get the carbs to stop leaking I can get it out on the road.
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