Ninja 250 help - Wrist Twisters
 
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post #1 of 13 Old 04-20-2013, 12:42 PM Thread Starter
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Ninja 250 help

I'm helping out a friend. He let his STOCK 2008 Ninja 250r sit for 3-4 years with only 933 miles on it. YUCK.

So I have the bike now. I have cleaned out the gas tank(brownish gad yuck!), thoroughly cleaned out the carbs including each jet and port, brand new battery. flushed and put in new radiator fluid.

But I can not get the carbs working properly. First, I could not get the bike to idle. So I adjusted the idle mixture screws and was able to get the bike to idle, but the response from idle was HORRIBLE. A LOT of lag.

So it seemed that it was lean. From what I have read, the bike comes somewhat lean. So I put a thin metal washer on the diaphragm needle, and that helped somewhat, but the bike idled around 4k with the adjustment all the way down. So I replaced the washer with a plastic one about 3 times as thick. The throttle response is great, but the bike still idles at 3.5k with the throttle adjustment all the way down.

I'm just starting to get fustrated with it now. All these changes in idle screws, washers/shims on the needle. The bike worked fine before it just sat for so long. I was really hoping just a douching would help it out.

help please!

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post #2 of 13 Old 04-20-2013, 12:45 PM Thread Starter
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I should add I have checked all the vac lines with started fluid. It is a great way to check for leaks

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post #3 of 13 Old 04-20-2013, 01:30 PM
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If I had to guess, I'd bet the carbs aren't clean enough. That's a long time to sit...

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post #4 of 13 Old 04-20-2013, 01:48 PM
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Quote:
Originally Posted by rmb View Post
If I had to guess, I'd bet the carbs aren't clean enough. That's a long time to sit...
+1. See if you can buy rebuilt carbs on ebay for cheap. For me, that was easier on my old dirt bike.

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post #5 of 13 Old 04-20-2013, 02:08 PM
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Like the others mentioned it's probably still the carbs, I use Mopar Penetrating fluid (from the dodge dealer) to soak and clean all my carb parts. This stuff is a miracle worker, makes gummed up old jets shine like new overnight.

Have you pulled/changed out the spark plugs? Odds are they are fouled from trying to run off that old gas, since he probably tried to start it on that old gas at some point. Also when it is running is it firing on both cylinders? Might be a weak signal from an ignitor pick up.

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post #6 of 13 Old 04-20-2013, 02:39 PM
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The ninja 250 is known for being a temperamental thing with regards to its idle. The important question is, did you ensure the bike was fully warmed up before adjusting the idle? If not, revert it all back to stock and start all over again.

The 250 carbs are simple, but very fickle to anything being gummed up, expecially in the idle/low speed circuit. As others have said, you still have issues in the carbs itself so I would undo any adjustments/changes you made to the carbs, tear them apart (don't have to separate) and clean them very well.

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post #7 of 13 Old 04-20-2013, 05:56 PM Thread Starter
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New spark plugs. Cleaned the carbs completely with carb cleaner and a tooth brush. Bike was warmed up completely.

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post #8 of 13 Old 04-20-2013, 06:29 PM
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Quote:
Originally Posted by boogunoogun View Post
Cleaned the carbs completely with carb cleaner and a tooth brush.
Strip the carbs of non metal parts and let it soak in some kind of carb cleaner and/or boil them. Make sure you lubricate the needle diaphragm when you reassemble (ATF works great).

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post #9 of 13 Old 04-20-2013, 10:12 PM Thread Starter
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I want to add, no one has tried to start it since it sat. We douched it first. I donno about soaking/boiling it. The carb is band new clean. 900 miles then a 3 year sleep. Then i cleaned it well. It looks brand new clean

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post #10 of 13 Old 04-20-2013, 10:19 PM
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You'd be surprised. There's a lot of really small nooks, crannies, and pathways in a carb that small. 3 years is a very long time with today's fuels. Long enough for fuel to gum up and become hard.

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post #11 of 13 Old 04-21-2013, 04:38 AM
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one word 'ultrasonic'...... had a 250 Ninja would not idle or run well till I threw the carbs in an ultrasonic. Even bought a set of carbs off ebay and ran the same.

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post #12 of 13 Old 04-21-2013, 04:54 AM
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Quote:
Originally Posted by Pvster View Post
You'd be surprised. There's a lot of really small nooks, crannies, and pathways in a carb that small. 3 years is a very long time with today's fuels. Long enough for fuel to gum up and become hard.
+1, I had the tinyest piece of crap in the pilot jet on my TW200, I could barely tell the difference when I cleaned it, it would idle on choke but would die as soon as any throttle was given.

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post #13 of 13 Old 04-21-2013, 06:03 PM Thread Starter
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I got it now. another cleaning and 1 spacer on the main needle. Response is much better than he remembered. It does idle a tad high at 2k. we said fuck it, good enough lets ride. Runs great now

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