Maintenance & Technical > KX250 / KX125

Getting the jet needle out of the throttle valve?

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Friar-Tuck:
Well, I certainly don't want to cause you any harm.
  You can clean up the problem without tearing your engine down.
    I have never burnt up an engine with stock jetting, or moving one jet at a time up or down.   You will get into trouble dialing in a bike on a 85 deg summer day and fire up the bike and rip around   on say a 40 degree day mid winter without changing anything.
   I am a fair weather rider myself.   I'm wracked with Arthritis and degenerative joint stuff, however I do swap things out for spring/fall and summer.   Funny thing is the more you work on the bike the faster things go.
  All this entails now is two pilots 50 summer 55 spring/fall.   two mains 162 summer and 168 spring/ fall
I just swapped needles so I'm still experimenting  and of course the air screw depends on current weather.
  (I use this for warmer cooler humid dry throughout the year.)

 I am afraid your silencer is soaked, I can find a thread on that if you need. Packing itself is about $15.00 or so.
   Cleaning out the exhaust valve and the expansion chamber, that's  gasket's and some other consumeables. If you don't need re-building wait 'till you do.  Get the old girl running the way you like and then worry about that.
    You certainly won't hurt anything running in your present state unless the exhaust valve gets gummed/carboned up.  If you can move the assembly in and out smoothly without strongarming it your ok.

    Spend a bit more time snooping around before you make a descision on where to start first or at all.
It won't cost anything and the more information you have the better decision you can make.   :wink:
  Tuck\o/     

mustangfury:
How easy should the exhaust valve move in and out. i had that out about a year ago and i re oiled it and cleaned it up. there wasn't any carbon buildup that i could see at all.  It looked like it didn't need it but i figured a good cleaning wouldn't hurt while i was at it.  Now, opening and closing it by pulling on the governor is pretty difficult.  I can do it by hand but it takes a little strength to move it.  is that normal?

Friar-Tuck:
If you disconnect the arm that pulls/returns  the rod  it shouldn't take more than a 8oz. or so of push pull to move in and out. 
Think of holding a can of soup in your hand.  The effort it takes to move the can up and down should be adequate to move the valve.
  Here's what I found on jetting specs:
  Oem  160 main                         FMF site 158 Main              (and using Bel Ray @32:1 )
           52 pilot                                        52 Pilot
       N1AL Needle                                     Stock needle
          3rd clip                                        3rd clip position   
         11/2 turns out on the A.S.                11/2 turns out

 You can be pretty safe on the FMF suggestions as they surely don't want you getting a new engine account they got your bike melted down.   This should be a good place to start.  you can replace the main with a 6mm socket by removing the 17mm plug on the bottom of the carb.
   Cut the bottom off a water bottle to catch the fuel from the carb bowl.
Having a clean air filter and fresh fuel also helps.
  Making one change at a time and keeping a log/notebook is also handy.   
If you can swing a service manual or clymer specific for your bike it will make things easier for you and they also have alot of other info to boot.     
  Tuck\o/

mustangfury:
yeah i have a clymer manual i have been referencing. It has a lot of good stuff.  I'll check the jets and see what size they are after i repack the silencer, and i'll go from there.

thanks all for your help. I'll let you know how things go.

bigbellybob:
if you suspect gear oil getting sucked in past a bad crank seal you can do a simple test. with the bike running lay it to the left/ ignition side and give it some good healthy raps. note the amount of smoke and spooge. then lay the bike to the right / kicker side and give it some more healthy raps. putting the bike on the right side will put the seal in the oil and if its sucking some in you should see the difference in smoke out the exhaust. o and the gear box will need to be at the correct level before trying this. and have her up to temp. its impossible to properly evaluate jetting and such if the bike isn't completely up to temp.

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