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post #1 of 19 (permalink) Old 03-27-2007, 09:02 AM Thread Starter
 
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Angry Problem at Idle

Well last week I did a valve adjustment, and yesterday I synced the carbs. But I'm still having this problem:

When I start the bike up for the first time of the day in the morning (as in it hasnt been running for at least 12 hours), the bike starts no problem. it gets up to around 1500 RPM and then after a few seconds it falls to around 900-1000 RPM. now, if I try to give it gas, it goes DOWN in RPM, and then bounces back to 1000. then i wait a bit and try the gas again and though its slightly slower than normal it revs. after about i dunno a minute or so I can ride it off, usually without problems, sometimes it bogs down right before I make a turn or something.

So I'm thinking there has got to be some problem. Does it usually take a bike that long to warm up? I've had mine for almost a year and it usually is ready to go as soon as u start it as long as the weather isnt cold. and the weather is around 60 degrees so I don't think its too cold. I've tried the idle adjustment knob but it doesnt seem to do that much (guess I should try turning it more times). yesterday when I synced the carbs the bike was not warm it was cold for a few hours. and I couldnt get the sync perfect, but I thought I got it pretty close. I might redo that tonite but I don't know if thats the problem.

Any advice? suggestions? Thanks in advance.
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post #2 of 19 (permalink) Old 03-27-2007, 10:36 AM
 
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It sound like you have a vacuum leak or are starving for fuel. Check your sync and spark plugs for a sign of problems (oil, fuel, detonantion, etc.) Post pics of them if you don't know what your looking for. If you don't find anything wrong try this. Spray carb cleaner around the carb bodies while the engine is running. (LIGHTLY, it is flameable) If the idle changes, then you have a leak and you have found it's location.
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post #3 of 19 (permalink) Old 03-27-2007, 10:42 AM
Rae
 
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my 250 took very lil time to warm up and be ready to go, but both of my girlfriends who ride the same bike often have to let theirs run for several minutes before it is warmed up and actually have to ride around a lil with the choke still on before turning it off...

hope that sheds some light...
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post #4 of 19 (permalink) Old 03-27-2007, 11:40 AM
 
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Originally Posted by 777Customs View Post
It sound like you have a vacuum leak or are starving for fuel. Check your sync and spark plugs for a sign of problems (oil, fuel, detonantion, etc.) Post pics of them if you don't know what your looking for. If you don't find anything wrong try this. Spray carb cleaner around the carb bodies while the engine is running. (LIGHTLY, it is flameable) If the idle changes, then you have a leak and you have found it's location.
Good old WD40 works for this too.

Throttle body's.........Its a Fuel Injected 250?

Sounds like the bike was sitting and the carbs are gummed up. Pull the drain screw out of one of the bowls and look at the tip to see if its dirty.
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post #5 of 19 (permalink) Old 03-27-2007, 12:39 PM
 
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try getting a bottle of Seafoam... if the carbs are gummed up... that **** will work wonders!
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post #6 of 19 (permalink) Old 03-27-2007, 01:22 PM
 
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try getting a bottle of Seafoam... if the carbs are gummed up... that **** will work wonders!
If the carbs are gummed up that or any other type of carb cleaner additive will make it worse! Jet orifices are tiny. Loosening up more crud in the float bowl will clog them. If they are dirty you must completely disassemble them and clean out all of the passage ways/circuits.
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post #7 of 19 (permalink) Old 03-27-2007, 02:05 PM Thread Starter
 
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thing is, this is abnormal behavior, last year before I mucked around with anything and before it sat for the winter it had no problems starting and going immediately, and definitely never used choke in temps > 50*.
Also, if its only been cold for a few hours it starts fine.

When i took it out for spring, I drained the carbs, the gas looked fine. pulled plugs too, and it started. it wasnt quite running right tho so I did valve adjustment and carb sync.

I might just take it to a mechanic... I want it running perfect and it seems like it shouldnt be too hard to fix...or maybe I'll just ignore it and let it warm up itself.
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post #8 of 19 (permalink) Old 03-27-2007, 02:11 PM
 
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Quote:
Originally Posted by RaeRR View Post
my 250 took very lil time to warm up and be ready to go, but both of my girlfriends who ride the same bike often have to let theirs run for several minutes before it is warmed up and actually have to ride around a lil with the choke still on before turning it off...

hope that sheds some light...
my wife's is this way Crazy...I don't know if they all are this way but hers is.

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post #9 of 19 (permalink) Old 03-27-2007, 02:17 PM Thread Starter
 
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Yeah thats the feeling I'm getting from the N250 forum 2. eh w/e I'll just deal with it and ride.

*sigh* I can't wait for a FI bike...
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post #10 of 19 (permalink) Old 03-27-2007, 02:44 PM
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its okay, mine also had an issue with the false neutral, and every time I took it to the dealer they acted like I was just a silly girl... the 250 was awesome, but it def doesnt compare to my FI honda, I never had to warm it up...even the gxsr has to warm up a lil before I can ride it, else it gets cranky and dies when I shift into gear!!
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post #11 of 19 (permalink) Old 03-27-2007, 02:48 PM Thread Starter
 
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its okay, mine also had an issue with the false neutral, and every time I took it to the dealer they acted like I was just a silly girl... the 250 was awesome, but it def doesnt compare to my FI honda, I never had to warm it up...even the gxsr has to warm up a lil before I can ride it, else it gets cranky and dies when I shift into gear!!
false neutral? as in the neutral light comes up but its not in neutral? I've had mine go into neutral between gears a few times.

looks like gsxr for my next bike if I have the money, otherwise a FI'd Honda CBR 600 at least. anything but carbs tho...
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post #12 of 19 (permalink) Old 03-27-2007, 02:50 PM
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Originally Posted by Crazy250 View Post
false neutral? as in the neutral light comes up but its not in neutral? I've had mine go into neutral between gears a few times.

looks like gsxr for my next bike if I have the money, otherwise a FI'd Honda CBR 600 at least. anything but carbs tho...
as in, its not in gear, but its not in neutral either!!! And then I couldnt get it down into gear! After I broke it in, that problem decreased but it would still happen when I would downshift to a stop...
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post #13 of 19 (permalink) Old 03-27-2007, 02:56 PM
 
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I always wait til my motor is at least 150 degrees before I ride away.
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post #14 of 19 (permalink) Old 03-27-2007, 03:08 PM
 
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Originally Posted by lumpy790 View Post
If the carbs are gummed up that or any other type of carb cleaner additive will make it worse! Jet orifices are tiny. Loosening up more crud in the float bowl will clog them. If they are dirty you must completely disassemble them and clean out all of the passage ways/circuits.
never heard that before...

I'm no expert on carbs that's for sure... but every time I've run into carb probs with gumming up or heard of it, I've always been told and used Seafoam... worked awsome for me...
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post #15 of 19 (permalink) Old 03-27-2007, 05:41 PM
 
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never heard that before...

I'm no expert on carbs that's for sure... but every time I've run into carb probs with gumming up or heard of it, I've always been told and used Seafoam... worked awsome for me...
It works great. especially on cars. But Lumpy is right too. If there is anything in the float bowl, it may become dislodged and plug up the jets, needles, passages, etc.

Crazy, what did the plugs look like? Were they coated in white, red, look sandblasted, or look new?

You might just need some new clean quality gas. Chevron and Texaco have cleaners in them that work well. Don't buy cheap gas.
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post #16 of 19 (permalink) Old 03-28-2007, 12:38 PM
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777... actually your statement should be don't buy generic gas. I have posted on this subject too many times to count.

Anyway... what kind of carbs on your bike? Do they have a accelerator pump? That needle could be clogged. Then it picks up on the intermediate jet and takes off....




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post #17 of 19 (permalink) Old 03-29-2007, 10:19 AM
 
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My bad GM. Thanks
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post #18 of 19 (permalink) Old 03-29-2007, 10:56 AM
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No its fine 777. I work in the industry so I have a unique or insider outlook on it.


I'm not Gas Man for being stinky or needing beano!




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post #19 of 19 (permalink) Old 03-29-2007, 11:07 AM
 
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Agreed. I work on cars all day, every day. I replace a lot of fuel pumps that fail due to the quality of fuel, plugged up fuel filters, or by being overheated by running tanks dry. I say the same thing over and over again.
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