Maintenance & Technical > KX500 Original
suddenly too rich
Friar-Tuck:
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
Hillclimb#42:
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.
tschisi:
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...
BDI:
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.
Friar-Tuck:
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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