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RM250 Idle/choke knob question

 
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dtia

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Since: Jun 15, 2005
Posts: 16



(Msg. 1) Posted: Thu Jun 23, 2005 12:30 am
Post subject: RM250 Idle/choke knob question
Archived from groups: rec>motorcycles>dirt (more info?)

Hey all,
I have a '94 RM250 that I've had since new. I pretty much quit riding
it in late '99 when I got my "00XR4. I get it out once a month to start
it up and run it up and down the block some.

It was during one of these times last year that while starting it the
idle/choke knob shaft snapped. I ordered and installed a genuine
replacement. Since then, this thing will not idle below a fast idle.
The install of the new idle/choke looked to be a no brainer, but now
after fooling around with the idle, jetting, air screw, checking for
air leaks and everything else I can think of, I'm wondering if its
install is more detail oreinted than I thought.

I can crank the idle down off of fast idle but it won't idle moderately
slow. I can hold the throttle barely cracked open to make it idle like
it should, so I've adjusted the throttle cable to hold the slide
slightly up. I know this is the wrong way to do it, but for now it's
the only way I can get it to idle right.

Does the distance that the idle/choke assy. screws down into its bore
on the carb have an effect on idle?

Thanks for any help. I'm trying to sell this thing and it's a great
bike other than this nagging problem.

Derek

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oldfart

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Since: Mar 30, 2005
Posts: 494



(Msg. 2) Posted: Thu Jun 23, 2005 12:40 am
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I had an 85 cr 250 that had a choke/enrichner valve that was used as an
idle adjustment mechanizm nightmare. To change idle speed you would
twist the knob counter clockwise to increase speed and opposite to slow
things down. Hope this helps.OF

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dtia

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Since: Jun 15, 2005
Posts: 16



(Msg. 3) Posted: Thu Jun 23, 2005 10:45 am
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Yeah, this knob works the same way. You twist it CW or CCW for idle
speed adjustment and you pull it up for choke.

Derek

oldfart wrote:
 > I had an 85 cr 250 that had a choke/enrichner valve that was used as an
 > idle adjustment mechanizm nightmare. To change idle speed you would
 > twist the knob counter clockwise to increase speed and opposite to slow
 > things down. Hope this helps.OF
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BD429

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Since: Jun 15, 2005
Posts: 26



(Msg. 4) Posted: Thu Jun 23, 2005 12:40 pm
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I've got a 95 RM250 and that's the way mine works also.
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dtia

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Since: Jun 15, 2005
Posts: 16



(Msg. 5) Posted: Thu Jun 23, 2005 2:00 pm
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I have the owners manual. It essentially tells you the same thing,
remove, clean, reinstall. Everything else carb-wise looks good. I'll
recheck the installation of the idle/choke assembly. It's new and
didn't look damaged before I installed it. Thanks for the suggestions
all.

Derek
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Tagger

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Since: Oct 28, 2003
Posts: 17



(Msg. 6) Posted: Thu Jun 23, 2005 3:38 pm
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Just recently, told us:

 > I have a '94 RM250
[snip some carb/idle related stuff]
 > install is more detail oreinted than I thought.

Do you have the service manual? Keihin PJ 38?

I have a '95 RM250, and the factory service manual. IIRC, The series ran
93-95. I can scan the carb section and post it for you in ABPM. However, in
regards to the choke/idle assemble it merely says "remove and inspect" or
the like.

You will want to check the white nylon/plastic looking ring to be sure it's
in good shape, as you may have an air leak there. Also check the needle
tip, which get pretty small for the last 1/8th inch or so... If the tip is
gone you need to be sure it's not *in* the carb.

I have mine set just low enough so it won't idle. It will slow idle within
one turn. I have removed & reinstalled the choke/idle assembly and found it
a straight-forward two minute procedure. Screw it out with 14mm, clean it,
screw it back in, pushing against the spring pressure to seat it & get the
threads started. On the bike, with a three gallon woods tank...

HTH-

--
=====================
Tagger
'95 RM 250
decked for the woods

8:48 RIP

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