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Old 05-14-2013, 10:36 AM
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Default Cr250 idle issue

     

Hey guys, picked up a 94 CR250 recently, runs great and is VERY fast. The only problem I'm having is with the idle. It starts up great(first kick, even when it's cold) but it doesn't want to idle at all, choke or not. I'm running premium gas with 40:1 mix. the top end was "said" to be rebuilt 2 years ago and hasn't been ridden much at all since. I tried turning the choke knob to adjust the idle with no improvement. I have read of similar issues being solved by adjusting the float valve? I'm guessing the next thing to be is get some carb cleaner and clean out the carbs? thanks for any info that you guys can give me!

to see it run go to youtube/p51aracing and click on cr250 idle
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Old 05-14-2013, 11:12 AM
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so you want to skip setting the floats ("the next thing is to get some carburetor cleaner and clean out the carbs")? there is a good post by faded in the knowledge base here on ATM with pictures even, regarding setting the float. Make sure they are even on both sides.

That particular caburetor is a headache, IMO.
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Old 05-14-2013, 11:15 AM
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can't see it would be your float pal, cuz your bike wouldn't run propely other wise. do take the carb apart clean the jets. Does the choke adjust at all?

---------- Post added at 04:15 PM ---------- Previous post was at 04:12 PM ----------

Quote:
Originally Posted by ossagp View Post
so you want to skip setting the floats ("the next thing is to get some carburetor cleaner and clean out the carbs")? there is a good post by faded in the knowledge base here on ATM with pictures even, regarding setting the float. Make sure they are even on both sides.

That particular caburetor is a headache, IMO.
This the link andy is on about for the float pal.
How To Set Your Motorcycle Carburetor Float Level (more commentary).
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Old 05-14-2013, 11:47 AM
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I had the problem and I got some new Boysden Reeds. Mine were chipped and old. It could help.
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Old 05-14-2013, 12:16 PM
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I went out an adjusted the throttle cable on the handlebars and it seems to idle just fine(maybe a little high). Should i still open the carbs and check it out? id hate to fix something that's not broken
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Old 05-14-2013, 01:58 PM
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Well if she is running fine then it isn't the carb just the throttle cable. How does the she run on start off to mid range and full open?. If she's idleing a little high then adjust it slightly to just ticking over.
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Old 05-14-2013, 09:07 PM
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There is a reason that there is play in the throttle. Turning and suspension movement can do the same thing as rolling on a bit of throttle. I do know the frustration if wanting some idle control. If you are looking at maintenance as something to avoid, you are going to have a hard time keeping the kind of riding partners most of us want. Since you seem unfamiliar, maintenance isn't fixing something that isn't broke, it is fixing it before it breaks. Neither apply here since this one is already broken.

Last edited by ossagp; 05-14-2013 at 10:55 PM.
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Old 05-15-2013, 02:17 AM
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I have the same bike and its never idled and its never botherd me
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Old 05-15-2013, 11:10 AM
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yeah, i have been giving the keihin pj credit for the current rumor that two strokes are not designed to idle.
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Old 05-15-2013, 02:45 PM
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Quote:
Originally Posted by ossagp View Post
yeah, i have been giving the keihin pj credit for the current rumor that two strokes are not designed to idle.
did wonder why you was giving it credit??? Then
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Old 05-15-2013, 08:38 PM
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Dan????
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Old 05-16-2013, 12:26 AM
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Thanks for the replies. My friend and I went through the carbs and changed the plug and it runs a lot better. Also getting new reeds.
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Old 05-16-2013, 12:33 AM
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so what exactly did the old plug look like?
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Old 05-19-2013, 09:39 PM
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completely coated in black, put a new one in and it starts and runs good
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Old 05-21-2013, 11:33 AM
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well check it again
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Old 06-25-2013, 03:21 PM
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Purchased as PWK and all is well, thanks everyone!
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Old 06-25-2013, 03:43 PM
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So you didn't think that perhaps a small carb adjustment may have solved your problems some what? Given that the plug was black, you were rich, a simple bit of fine tuning may have helped get the idle back..... I would have suggested a few small things but seeing that you already have the PWK I guess there is no need.... And I hope you didnt put in a hotter plug..........

In fact I'll challenge you to try solve this problem with the idle....almost certain you can get it somewhat better!!

---------- Post added at 05:13 AM ---------- Previous post was at 05:12 AM ----------

Question-Have you installed the PWK??
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Old 07-01-2013, 10:56 AM
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I could of rebuilt the carb if i wanted to, but instead of spending 60 on a outdated carb that I didn't like; I spent it on a newer carb that was designed better(Idle adjustment not on the choke tower). I rejetted and installed the PWK the day I got it and loved it ever since.

I was riding at Ceder Creek this past weekend and the bike ran great!

---------- Post added at 09:56 AM ---------- Previous post was at 09:44 AM ----------

Here's a video of my bike at Ceder Creek Michigan, incase anyone is interested.

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