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i have a little digital multi meter, coils testing ?

  • Thread starter Thread starter Anonymous
  • Start date Start date
A

Anonymous

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how can i do some checks on my two coils on my 80 gs450L with a little digital multimeter i have ?

what settings do i use and for what tests ? how many volts or X ohms do i set it to for certain tests ?
there are several ohms and voltage settings on the meter,


i suspect one of the coils is going bad due to having a wet spark plug all of a sudden lately. and the other oen is dry but black.

also how do you test a spark plug wire boot/cap ?

thanks
 
Believe it or not a friend of mine is comming over today to do that test on my coils. I'll let you know what he does.
 
i just got 3.9 and 4.0 resistance at 200 setting on my coils

i think 5 is the most you want to see on old coils
they are putting out awesome white snappy spark at the plugs, so humm.,.

good luck with yours, did you clean every leectrical connection on your bike already ?
i might have unknowingly fixed my problem by doing such before i checked for spark,
im gonna fire her up in a minute and see how it revs and idles,.

good luck :D
 
Also measure the resistance from cap to cap on the same coil and compare it with the one in the book. (secondary resistance)

Plug caps should have a 5ohm rating.
 
cap to cap ?? only one cap per coil, at the plug

what do you mean ?

thanks
r
 
fast68 said:
cap to cap ?? only one cap per coil, at the plug

what do you mean ?

thanks
r
Click to expand...

:roll: Forgot that, used to working on fours...

EARL!!! where are you?
 
Not trying to be picky Robinjo. :-) :-) That would be a 5K resistance.

Earl :-)


robinjo said:
Also measure the resistance from cap to cap on the same coil and compare it with the one in the book. (secondary resistance)

Plug caps should have a 5ohm rating.
Click to expand...
 
earlfor said:
Not trying to be picky Robinjo. :-) :-) That would be a 5K resistance.

Earl :-)


robinjo said:
Also measure the resistance from cap to cap on the same coil and compare it with the one in the book. (secondary resistance)

Plug caps should have a 5ohm rating.
Click to expand...
Click to expand...

Thats what I meant! :wink:

Ans what about the secondary resistance?
 
With two plug leads on a coil, there is an internal mechanical connection between the two leads, so resistance is easy to measure. Since the voltage is produced by inductance, I dont know how to check resistance with only a single lead on a coil. I am not aware of any connection that can be made to complete the circuit. Maybe some of our electrical engineers can make a suggestion.

Earl

robinjo said:
fast68 said:
cap to cap ?? only one cap per coil, at the plug

what do you mean ?

thanks
r
Click to expand...

:roll: Forgot that, used to working on fours...

EARL!!! where are you?
Click to expand...
 
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