Our RMX is all CHOKED up!!!

Studboy

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#1
OK,  I finally got the bike to fire a couple of weeks ago (Loose stator wire.)


The bike <91 RMX250>  does not run right at ALL.  It feels as if the choke is stuck on.  It blows smoke and oil like a mosquito fogger and the response and power REALLY REALLY suck.  I have tryed everything that I could think of,  but here is the list just in case there is anything I've missed.

New Topend.
New Reeds.
All new gaskets.
New plug.
Cleaned carb (about 15 times!!!, maybe I'm putting it together wrong???)
Repacked Silencer and cleaned pipe.
Replaced Right Side Crank Seal.  (I thought for sure that was the problem but it didn't help hardly at all, if any.)
Put new jets in carb. (1 size smaller main, same pilot.)
Bought new airfilter and installed it.
None of the above have helped significantly.
Any tips or ideas would be appreciated since we want to go riding tomorrow!!!

Thanks Guys,

Richard
 

Farmer John

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#4
:think: I missed that when I read thru........

wow...I think you covered everything......
 

Studboy

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#5
Like I said, I thought for sure that's what it was. The left crank seal wouldn't do anything like that would it??? I assumed that it would cause a lean condition. The bike pukes all over itself and I can't think of any reason other than a curse as to why the bike won't run. We have spent hours and hours checking and rechecking everything that we can think of!!!! This is getting REALLY frustrating.
 

Studboy

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#6
Is there any chance that the little O-Ring that seals the plastic holder that the float holder thingy (I'm not quite sure what to call it.) in the Mikuni carbs is culprit??? The bike also seems to cut out at high RPM's. The weird thing is, I forgot to turn the gas on one time when I was running it and it ran really good for a second before it ran out, which tells me that I'm rich somewhere...(obvious.) I just can't imagine my jets being this rich just because I put new reeds and a new topend in it.
 
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#7
oh yeah the rmx is a fun bike isnt it?? haha it seriously has a mind of its own and moodswings like a teenage girl!

but seriously, check your piston. which way is the arrow pointing? if its towards your intake you found your problem. I know it sounds dumb, but my friend did that once and it ran similar to what you are describing. (i personally didnt even know it would go together that way)

but if that isnt it, which it probably isnt, you could try your timing, i had my timing plate vibrate loose and it screwed over my timing. Also you may want to check your pipe and silencer, if there is any hole or significant ding in the silencer it will rob lots of power. I dont know why, but i replaced the silencer on my bike and it woke it up amazingly with an exact same replacement. I think my pipe/silencer joint pipe thingy was dented, as i put a smaller pipe on it to replace it and it ran terrible.

One more thing to try is check your oil.. Every time i put too much oil in the bike, it would run exactly as you state, and spew transmission oil out the powervalves and the overflow tube. i dont know what hte problem was, i replaced everything i could think of including the powervalves and cylinder and all the gaskets and bearings in the bottom end.

well good luck!
 
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#8
one last thing is your floats are foam or something and will start to absorb gas over time. they may be sitting lower than they should be and will need replaced or adjusted to float higher.
 

bclapham

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#9
to figure out if you have an oil leak, measure the vol of trans fluid you out in then run it for as long as you can then drain it and see the difference.

sounds like a buggered carb to me- is the idle connected to the choke- i am sure i read a thread whereby the owners were swapping out the carbs for some reason
 

RM_guy

Scared of DirtWeek<BR>Club *********
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#10
Did you put the right crank seal in back-wards? It will leak if you did.

I know you said that you cleaned the carb but I had a similar problem where dirt got under the choke plunger and was letting fuel pass through when the choke was off. Does it start without putting the choke on? That a sure sign that the plunger isn't sealing all the way from either dirt or a bad seal.
 
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#11
Stud,
Is your float bowl set correctly? Also did you replace the float needle and seat in the carb. What kind of Oil and how much are you putting on the filter?
What plug are you using?
IF you have had problems in the past with the carb, did you make sure your pipe isn't full of gas/oil? How about your silencer is it plugged?
Are the holes on the stator sloppy enough to change the timing if it was put back in the correct place?
If all else fails I can hook you up with a friend of mind that has an extr RMX motor for just that vintage bike.
Good luck,
DT

P.S.
The RMX is one of my all time favorite bikes! and I've had a few.
 

Zerotact

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#12
Any chance you could get a real carb? If I remember correctly the rmx had a funky carb on it that didn't have all the adjustments.. you should be able to score a PWK and slap it in there.......
 

Studboy

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#14
The float level seems to be fine. The piston is in the right way. We do have a better mikuni on the bike (one WITH a pilot jet! :thumb:) The choke is clean and I even tryed the choke plunger/lever from the stock carb with no avail!!! I'm about ready to put in some leaner brass and see what happens.

The bike exhaust doesn't smell funny at all (like tranny fluid.) and I just put a new seal in, so I'm ruling that out for now.
 

Studboy

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#15
I guess we're not in a huge hurry to get this thing running now.

My riding buddy just broke his leg yesterday. :(

He overshot my 45 ft. double on his XR250!!!!! :scream: :scream:

He may have set a new distance record on a XR though!!! ;)