oky! spark at last but......

[kx250.1698]

hi guys, I have put my kx250 ignition coil on and finaly the bike have spark when you kick it, I am going to change the float bit so make it start easy again because all the petrol came out of the overflow.Is there maby something els i could tray to make it start easy? haven't kick started it yet going to do that today?

[KX500freak]

1/cold start,hold bike till a drop of gas pours out ,
choke in ,no gas ,it should fire up in 1,2 maybe 3 kicks

2/hotstart ,hold throttle slightly open ,maybe 1/4 ,kick and ride 



3/emergency cold start, no choke ,throttle wide open ,gas on ,few kicks it should fire


4/emergency hot start, like if u cant fire it up after a fall or stall.
gas off throttle closed ,kick several times,motor dries out ,gas on ,1/4 throttle

hope to be of any help 

[kx250.1698]

oke the bike have spark now but i kan kick it uintl i am dead wont start??

[Hillclimb#42]

Still having carb issues, or timing. Maybe fuel not flowing through petcock. Test fuel flow by removing fuel line and opening valve. If that s OK, then hook it back up, turn it on, give it time to fill float bowl. Lean over to the floor. gas should poor from bowl's overflow. If that works choke and kick, if no start check and change plug. Then see if the plug is wet, oily, dry, smells like fuel. That sorta stuff. You might check jets for sizes and for debris. No answers then I would see what timing is doing. Forget pulling it around to start, you are close to having it going.

[kx250.1698]

Still having carb issues, or timing. Maybe fuel not flowing through petcock. Test fuel flow by removing fuel line and opening valve. If that s OK, then hook it back up, turn it on, give it time to fill float bowl. Lean over to the floor. gas should poor from bowl's overflow. If that works choke and kick, if no start check and change plug. Then see if the plug is wet, oily, dry, smells like fuel. That sorta stuff. You might check jets for sizes and for debris. No answers then I would see what timing is doing. Forget pulling it around to start, you are close to having it going.

This is my 125, it is not having problems with timing timing is perfect but changed the coil ignition now the bike have spark when you kick it but would not start but when you push it it starts, yes have tryed that, buki runs gr8 but in if it is not running in powerband then it runs very weak, jest:160main/52pilot

[Hillclimb#42]

What about plug color? You tried a new plug? Silencer is clear of obstruction? Needle position?, mixture screw is how many turns out?

Its kinda confusing me too. If it starts easy, when pushed, and runs great, except on top-end or through the mid, it sounds like more than one thing. Are you sure the reeds are sealing? or maybe fat on settings, but that doesn't explain easy to push start. Leaning the main out should let it clean out while revving in neutral. The needle adjustment gets you the powerband mid, and pilot deals with starting and idling.

What happens when you give it full throttle? when starting and also when running in neutral?

[kx250.1698]

What about plug color? You tried a new plug? Silencer is clear of obstruction? Needle position?, mixture screw is how many turns out?

Its kinda confusing me too. If it starts easy, when pushed, and runs great, except on top-end or through the mid, it sounds like more than one thing. Are you sure the reeds are sealing? or maybe fat on settings, but that doesn't explain easy to push start. Leaning the main out should let it clean out while revving in neutral. The needle adjustment gets you the powerband mid, and pilot deals with starting and idling.

What happens when you give it full throttle? when starting and also when running in neutral?

Yes new plug, air skrew is 3 turns don't know (what is mxiter skrew?) silencer is clear, piston look like new. top end very good, low end very weak form 1ste to 2nde when powerband kick in it is alright but without powerband very very weak.

[kx250.1698]

[Hillclimb#42]

Air screw =mixture screw. Same thing. Now that makes more sense, the way you describe it there. I thought you were sayin' it had no top end and ran well on bottom.
  The first thing I would check is the pilot jet for debris. 3 turns out is a long way out. I would also check to see that the powervalve is not stuck open. Also could be flooding still, and the top end power uses up the extra fuel till it cleans out. How's the reeds? What was the plug color?

[kx250.1698]

Air screw =mixture screw. Same thing. Now that makes more sense, the way you describe it there. I thought you were sayin' it had no top end and ran well on bottom.
  The first thing I would check is the pilot jet for debris. 3 turns out is a long way out. I would also check to see that the powervalve is not stuck open. Also could be flooding still, and the top end power uses up the extra fuel till it cleans out. How's the reeds? What was the plug color?

Air skrew is 3 turns out, jets are clean, i tkink it is the magneto,(the coil at rotor)that needs to be re wine, it have spark but not enought??? can it be??

[Hillclimb#42]

Hopefully someone else will chime in here. I have not had many electrical problems. It seems to me that, it would have a weak spark at all rpm's and revving it up would not help a weak spark. My air screws are between 1 and 2 turns out. I start at 1 1/2 and tweak one way or the other after it runs good with jetting at 1 1/2. When checking for spark, I have trouble seeing it during the day, especially with a soft kick. The book says to always use a plug when checking for spark or you may cause damage without it.
  Again, I am not the electrical expert, but I can't see how the windings would have been changed. What about cleaning and securing the ground connections? Have you tried a cold start with no choke or holding throttle wfo? I bet you have, and I know its way basic, but I am throwing ideas out there, no insult intended.
 

[DoldGuy]

As I stated  your other post a fresh 93 has 165-170 compression, what is yours???
It seems you are chasing after an electrical problem, when it could be as simple as compression. Help us, help you.

[Jopiz]

Electricity doens't know if you are pushing it or kicking it. I've been told not to use a resistor spark plug cap with a resistor spark plug. May be worth checking. Maybe you should check the crank seals. Clean all your contacts with contact cleaner. Check the stator with an ohm meter. Check the pickup pulse coil with meter. Those are just simple coils. If the readings are 0 ohms or infinite you got a bad coil. Also if they are out of spec they might not operate correctly.

Lack of compression makes it hard to start. When you push it you get a lot more RPM so start up will be easier. Also if the timing is off it wont kickstart easily.

Usually when a coil breaks down the CDI also gets damaged. These things are really basic stuff with outboard engines. CDI's and coils are replaced for every 5 year. Do you have an access to an another CDI?

Go and get a nice compression gauge and a service manual for your machine. You'll be surprised how many problems you diagnose with those.

Eliminate these things one at a time. If you do everything at once eventually you wont even remember "What got it running".

-Jopizz

[kxracer]

Dear all,

something you may want to check is the gap between the pickup coil and the magento flywheel.

My mates RM250 all of a sudden would not start off the kick start, only by bumping it and then nothing.

We took it a local motorbike electrical specialist who put an oscilliscope on the ignition. This proved the coil, CDI and stator.

The gap between the flywheel and pick up was 3-4 mm and when he moved it to around 0.6-1mm, the spark was much stronger.

We are now sorting out the fuelling issues.

Hope this helps.

[dangerous dean]

my rm250 started having probs like the above and it turned out to be the stator windings,it would start with a push but had trouble starting of a kick,if you can find out what resistance the coils are supposed to have then measure them to make sure they are within range,also a trick i learnt from other top enduro racers who had to start the bikes 1st kick was to 1,tip the bike over to make sure enough juice in the carb,2 give the bike a couple of gentle prods on the kick not full kicks but enough to charge the cdi up,find tdc and one big kick also the old favourite of "leading" the plug tip,which involves using a pencil to coat the tip of the plug when dry also if it helps use a piece of emery cloth on the ignition pick ups on the flywheel just to take the rust off and make good contact hope it helps...ps anyone know what other kickstarts fit a kx125 1995 ?