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Author Topic: suddenly too rich  (Read 25016 times)

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Offline Friar-Tuck

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Re: suddenly too rich
« Reply #45 on: July 23, 2010, 03:53:49 AM »
  I don't think Polar Was trying to get you upset T,  He was laughing no-one, (All of us)  had made a suggestion to Check the compression.
   There is a little lost in translation that's hard to get across.  (:oops:)

  Won't engines with low static compression start and run, The bikes with a compression release will start,
   There wasn't any dramatic event to cause the issue, You have plenty of fuel, spark & air... It looks like you have too much fuel,  But is that from attempted starting ?

 I'm stuck on the timing...  Even if the bike was Really rich, like soaking the silencer dribbling spooge rich, it would start and run... (albeit poorly)
   I'll look for a test for the CDI,  (It should be in electrical section in my Gallery)
  Tuck\o/ 

Wiring:  http://www.kxriders.com/coppermine/displayimage.php?album=random&cat=1&pos=-1797

Specs For CDI (Testing) :  http://www.kxriders.com/coppermine/displayimage.php?album=259&pos=20
« Last Edit: July 29, 2010, 04:47:58 AM by Friar-Tuck »
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Offline Hillclimb#42

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Re: suddenly too rich
« Reply #46 on: July 23, 2010, 04:58:59 AM »
I know this may have been mentioned already, but here's my take on it. I have had bad plugs that will foul about half way, then run, but sputter at lower rpms. Also, summer temps and humidity often require stepping down a main jet size, and possibly turning out the air screw. Also, if it has the idle screw in too far, it holds up the slide and loads it up at lower rpms, and adds to the extra "bings" after you let off the throttle. As far as the wet petals, and intake, that is probably how it is, especially while choking. I have noticed, that if my bike does not start right normally, then the choke can flood the engine by just kicking alot. If it doesn't start right away turn off the choke. If you think its flooded twist it wide open, and if its really flooded turn off the gas. Make sure silencer is not collapsing. Its rare, but the packing can clog it up, if the center tube decays. If the floats are having trouble, you will have fuel pouring from the overflow. Be sure that the vent lines are not blocked, so they can work.
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Offline tschisi

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Re: suddenly too rich
« Reply #47 on: July 28, 2010, 08:52:56 PM »
I managed to get it running with starter spray (brake cleaner didn?t work).
Once it runs, it also runs just with fuel.  :-o
I would take that as an indication of low compression, but i also found something in the ohm values.
Everything is fine, except of the primary side of the ignition coil.
Here i only got 1 Ohm instead of 31.
Guess i should buy a new coil, and also find someone with a compression tester...
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2004 kx125
1990 kx500 (sold)

Offline BDI

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Re: suddenly too rich
« Reply #48 on: July 29, 2010, 03:42:48 AM »
That's what sucks about probs like yours. Ignition problems exhibit the same symptoms as fuel problems. Anytime you have a problem like this you should check everything just to rule it out, even if you think theirs no way that's what could be wrong.
« Last Edit: July 30, 2010, 03:11:29 PM by BDI »
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Offline Friar-Tuck

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Re: suddenly too rich
« Reply #49 on: July 29, 2010, 04:17:59 AM »
 Hey T, 
 You should be able to swap out coils on your two fifty to verify the problem. 
    There may be several things working against you here so don't give up!   
 The starting ether has a much lower flash point than the pre-mix. 
 I never heard of using brake cleaner for starting,( the stuff here is pretty caustic.)
  I have used it to look for leaks as the engine, (I thought) would stall if it got pulled in an air leak.
     There is something new to learn every day..(so much for me being stuck on the timing..Dohh! :roll:)
Hang in there Buddy!
  \o/
 
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Offline tschisi

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Re: suddenly too rich
« Reply #50 on: July 29, 2010, 08:35:04 PM »
I also measured my 250?s coil, and the ohm values are different.
I?ll get a new coil, i?m afraid i could damage the 250?s...
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2004 kx125
1990 kx500 (sold)

Offline BDI

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Re: suddenly too rich
« Reply #51 on: July 30, 2010, 06:28:59 AM »
You wouldn't hurt the coil but if it is not the right one you could burn up the cdi. Either way not good.
« Last Edit: July 30, 2010, 03:12:24 PM by BDI »
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Offline tschisi

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Re: suddenly too rich
« Reply #52 on: July 31, 2010, 07:35:36 AM »
Guess i would have burnt it up already with my 1 Ohm coil  :wink:
Anyway, i?ll order a new one this week!
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2004 kx125
1990 kx500 (sold)

Offline tschisi

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Re: suddenly too rich
« Reply #53 on: August 31, 2010, 03:58:48 AM »
Newsflash!

The new ignition coil didn?t make any change.

Done a comression test:
Lubricated the cylinder by kicking several times with fuel in the bowl and the throttle wide open, hope that?s enough?!
Kicked with the throttle wide open again, result is about 100 to 105 psi.

What do you think?

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2004 kx125
1990 kx500 (sold)

Offline BDI

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Re: suddenly too rich
« Reply #54 on: August 31, 2010, 04:49:14 AM »
My rc car has more comp.
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Offline kaw rider

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Re: suddenly too rich
« Reply #55 on: August 31, 2010, 09:41:13 AM »
sounds like you need to pull your topend and inspect it.
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Motorrad

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Re: suddenly too rich
« Reply #56 on: August 31, 2010, 10:21:43 AM »
Quote from: kaw rider on August 31, 2010, 09:41:13 AM
sounds like you need to pull your topend and inspect it.

With those kind of numbers... you need to walk in the garage and make sure the top end is still on the bike.  ;)
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Offline kaw rider

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Re: suddenly too rich
« Reply #57 on: August 31, 2010, 11:05:27 AM »
i had a max power replate one time only produce 60 psi.
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Offline tschisi

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Re: suddenly too rich
« Reply #58 on: August 31, 2010, 04:35:11 PM »
I?ve already had my top end disassembled several times, looked not too bad to me.
The gap between cylinder and piston seemed to be ok, also played around with the feeler gauge.
So i will replace the rings.
What do you think about taking the cylinder off with the head mounted?
Head gasket...
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2004 kx125
1990 kx500 (sold)

Offline kaw rider

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Re: suddenly too rich
« Reply #59 on: August 31, 2010, 05:04:09 PM »
was the cylinder replated lately.
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