Maintenance & Technical > KX500 Original
stalling problem
Friar-Tuck:
Well,
If you think the fuel system is good, it's on to electrics.
Since the bike starts & idles, or runs for 5 min or so, And then just dies.
I think I would check all the wiring for chafing, clean & lube the connections w/ dielectric grease .
Make sure all the grounds are clean, corrosion may be killing your bike after it gets too hot to carry the juice...
Remove the kill button and rule that out.
Swap the plug and check the cap and wire. Maybe cut a small piece off each end and re-attach the cap & coil end.
(Ohm out the wire and wiggle it while connected to your meter to look for a possible break.)
That's the easy stuff I think...
Next would be to remove the coil and start checking that.
An ohm meter won't detect a layered short or a breakdown in the insulation or a wire under high voltage, or
that shorts due to heat.
Do you have a multimeter, and have you used one?
set your mmv meter to x1 ohm
between the coil terminals .
primary should be 1.0 ohm +/- 15%
secondary (spark plug lead and ground terminal) 5.9 k ohms +/- 15%
Lets see how all that checks out.
The cdi has a warning not to check it with too high a voltage multimeter or we could damage it.... :-o
Tuck\o/
BDI:
Check all coils. check them cold then heat them with a hair dryer and check again. Coils are nitoriouse for working when they are cold but quit when they get hot. Very typical problem.
Friar-Tuck:
Thanks BDI,!
I never thought of the Hairdryer!
\o/
Polar-Bus:
--- Quote from: 87500rider on July 24, 2010, 04:31:52 AM ---i have a 1986 kx500...i start it and it idles fine...then wen i ride it it runs fine for about 5 minutes then bogs and shut off as im riding...has anyone else had this problem...any tips on how to fix it?
--- End quote ---
Why does everyone always suspect bad electrical components right off the bat ? Yea, the do ocassionally go bad, but the other 90% of the time it's fuel and or worn top end related. Check the simplist things first, like consistant adequate fuel flow. Need more specific details about how the bike starts runs, dies then restarts... is your plug wet after it dies ?
Guys, in all honesty i've owned 9 dirt bikes, and 6 street bikes, and 5 snowmobiles, and out of all these I had 1 bad stator on my '84 KX125, one bad CDI on my '81 Blizzard snowmobile, and those wer both on 20+ year old vehicles...
BDI:
--- Quote from: Polar-Bus on July 27, 2010, 02:50:16 AM ---
--- Quote from: 87500rider on July 24, 2010, 04:31:52 AM ---i have a 1986 kx500...i start it and it idles fine...then wen i ride it it runs fine for about 5 minutes then bogs and shut off as im riding...has anyone else had this problem...any tips on how to fix it?
--- End quote ---
Why does everyone always suspect bad electrical components right off the bat ? Yea, the do ocassionally go bad, but the other 90% of the time it's fuel and or worn top end related. Check the simplist things first, like consistant adequate fuel flow. Need more specific details about how the bike starts runs, dies then restarts... is your plug wet after it dies ?
Guys, in all honesty i've owned 9 dirt bikes, and 6 street bikes, and 5 snowmobiles, and out of all these I had 1 bad stator on my '84 KX125, one bad CDI on my '81 Blizzard snowmobile, and those wer both on 20+ year old vehicles...
--- End quote ---
Your right a couple of jack asses like us probably shouldn't even waste are time trying to help.
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