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Old 04-04-2015, 08:42 PM   #21
cuong-nutz
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Perhaps the gas tank vent is blocked.
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Old 04-04-2015, 09:23 PM   #22
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Perhaps the gas tank vent is blocked.
Maybe a full going through Cuong.
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Old 04-04-2015, 10:44 PM   #23
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Bad fuel? Drain gas and carb bowls. Or dirty carbs. Sometimes if you run the out of it, you'll clear up the carbs lol

OP, where are you located?
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Old 04-04-2015, 11:40 PM   #24
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Dr Coung is the best! He knows all about the 250. He helped me with mine. Thank you Coung!
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Old 04-05-2015, 06:19 PM   #25
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Sounds like you have water settling in the float bowls. Drain them both and collect what comes out. Then start up bike and repeat until it comes out clean.

Sea foam in the tank should help in the long term. I put in a couple of ounces after every fill.
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Old 04-05-2015, 07:15 PM   #26
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Sounds like you have water settling in the float bowls. Drain them both and collect what comes out. Then start up bike and repeat until it comes out clean.

Sea foam in the tank should help in the long term. I put in a couple of ounces after every fill.
I'm located near the Galleria.

How do I get to the float bowls and how do I drain them?
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Old 04-05-2015, 07:26 PM   #27
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Here is a link.http://faq.ninja250.org/wiki/How_to_...he_float_bowls
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Old 04-06-2015, 09:05 PM   #28
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Sounds like you have water settling in the float bowls. Drain them both and collect what comes out. Then start up bike and repeat until it comes out clean.

Sea foam in the tank should help in the long term. I put in a couple of ounces after every fill.
Here's the thing though, if it was water settling in the float bowls, doesn't that mean it'd run like all the time? I'm guessing it might be the exhaust valves since it runs fine in the beginning, then warms up and gets worse and worse. That sounds like valves?

What tools would I need for the working on the valves and adjusting them? And since I'm doing that, I want to go ahead and work on the carbs to, get them cleaned and synced, what would I need for that?
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Old 04-06-2015, 10:26 PM   #29
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Quote:
Originally Posted by z0sum View Post
Here's the thing though, if it was water settling in the float bowls, doesn't that mean it'd run like all the time? I'm guessing it might be the exhaust valves since it runs fine in the beginning, then warms up and gets worse and worse. That sounds like valves?

What tools would I need for the working on the valves and adjusting them? And since I'm doing that, I want to go ahead and work on the carbs to, get them cleaned and synced, what would I need for that?
For the carbs, don't separate them when you pull them off. Clean them and look up bench synching. It'll get you close.

For the valves, you'll need a couple of sockets, a screwdriver and some feeler gauges. You'll also want to get a pair of O-rings to replace the ones on the coolant tubes. Match them at O'reilly out of their box behind the counter. You'll also need a bucket to catch coolant, some grease to lube the new o-rings, and some new coolant. It's a bit tedious the first time through, but it's not difficult.
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Old 04-07-2015, 01:12 AM   #30
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You're down the road from me. When are you free? You can ride over or I can ride to you. I'm near buffalo speedway and Richmond.
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Old 04-07-2015, 06:27 AM   #31
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Check also the battery connections. a loose ground can cause a lot of trouble.
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Old 04-07-2015, 08:19 AM   #32
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Quote:
Originally Posted by z0sum View Post
Here's the thing though, if it was water settling in the float bowls, doesn't that mean it'd run like all the time? I'm guessing it might be the exhaust valves since it runs fine in the beginning, then warms up and gets worse and worse. That sounds like valves?

What tools would I need for the working on the valves and adjusting them? And since I'm doing that, I want to go ahead and work on the carbs to, get them cleaned and synced, what would I need for that?
Not necessarily. If there is just a little bit of water that occasionally gets in to the injection system, it could run erratic.

But all of this sounds like the fuel system. I haven't experienced drastic changes in the valves even when they were tight. The 250's really don't get that hot.

You will also want to check that the tank petcock is working properly. Easiest way to check is to disconnect the fuel and vacuum lines. Then put a hose on the vent of the petcock and apply light suction. Fuel should come out of the fuel side in a steady stream only when suction is applied.

Now is a good time to go through everything. Clean and Sync Carbs, flush coolant, check valves, change oil. All together about 4 hrs of work.
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