Maintenance & Technical > KX500 Original

Do the 5k or 10k Ohms resistors go in time in the spark plug CAP ?

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hughes:
Yep. less than 3.00 dollars from dennsikirk.com

FIVE-HUNGE:
I'm a little confused about what Gowen said....I can't remember when's the last time I saw a 10K resistor cap on any machine.
Just about everything takes a 5k ohm cap. I just unscrew the cap from the coil wire and check resistance with an ohm meter. I usualy get 4 to 5 k ohm on a good cap. I've tried getting spark from the bare coil wire which works but even a "going bad resistor cap" can produce a spark with sparkplug installed and grounded on the motor.
It might just end up being too weak for the motor to run properly.
What i'm trying to say is it's impossible to measure peak voltage and resistance by just seeing a spark jump from the wire to the motor. Anybody with me on this ??

hughes:
Yes, You will need a peak reading volt meter to check voltage coming from the stator to the cdi box and then to the coil. Rapair.com has adapters that plug into multi meters that allows them to read peak voltages. I have never seen and enigne with 10k resistor I agree most are 5k.

gowen:
I guess I'm slack. I've always used a spark to judge the ignition. It doesn't take much of a spark to run a KX. I ran with a weak spark for years. I guess I missed the question as I am dodging from this site and work at the same time. Resistors are there just to reduce electrical noise from the coil/wire/plug from interfering with the CDI. I've never really pushed the issue, as I don't have a stock ignition system. It has no resistor. My previous ignition system had one. And like all, they are 5k. There is no performance loss with using a resistor I don't believe. I could be wrong.

As for my comments on caps. If you suspect a cap, replace it. Half the time your cap is going to read 0 like mine and like my old stock one.

hughes:
Gowen they are for elec. noise. In some cases when it fails it increases it's resistance which will effect the voltage going to the plug. It seems that the 89 and newer 500's ran a plug with a resistor in the plug. My 87 factory plug doesn't have a resistor but the plug cap itself is the resistor. I can dig up more info when I get home.

My plug is b8eg

89 and new 500's run a br8 the R stands for resistor. I have a ngk book at home I'll check and see.

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