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Not getting spark. Now what?

  • Thread starter Thread starter fyarl666
  • Start date Start date
Did you measure 12v at the coil (+) ????
Also the coil(-) shoul go up and down as you crank the engine over .
 
posplayr said:
Did you measure 12v at the coil (+) ????
Also the coil(-) shoul go up and down as you crank the engine over .
Click to expand...

No, I didnt measure 12v at the coil. And I might need a few more sets of hands in order to hold the mulitimeter leads and crank the engine at the same time. Ill report back tomorrow.
 
fyarl666 said:
No, I didnt measure 12v at the coil. And I might need a few more sets of hands in order to hold the mulitimeter leads and crank the engine at the same time. Ill report back tomorrow.
Click to expand...

Alligator clips

Strip wire wrap around the probe


Hold between knees
 
tkent02 said:
And are you using the range scale correctly? K ohms for the secondary? Should be 2 - 5 ohms, on K ohms scale it will read zero.
Click to expand...

Best to keep the VOM on the 20VDC range, less complicated that way. :rolleyes:
 
fyarl666 said:
Left side coil:
Ohms @ 200: 3.7 primary,
ohms @20K: 1 secondary.

The service guide I got from Bike Cliff's site indicates that the primary should be 3.5 - 4.5, and the secondary should be 23 - 25,

right side coil:
ohms @ 200: 3.8 primary
ohms @ 20k: 0 secondary

service guide states primary should be 3 - 5 primary, and 21 - 25 secondary.
Click to expand...
http://www.mtsac.edu/~cliff/storage/gs/GS250T-300LZ_manual-82.pdf
Pg 146...

Measure the coils secondary resistance between the terminal the white wire connects to on the coil and that coils high tension lead, and also the black/yellow coil terminal and it's respective high tension lead.
 
tkent02 said:
He's measuring resistance in the coil?
Click to expand...

I know, and I suspect incorrectly, so doing tests using the 20 v scale are probably going to be within the grasp of most people. Using the +12v as a reference point, check in and out and of both thee and no sparky the coils are bad by a process of elimination .
 
I'm stuck at work for most of the day so I won't be able to do any testing till later this afternoon.

However...

Just for argument's sake, let's assume both coils are shot. How would that have happened, and how can I keep it from happening again?
 
fyarl666 said:
I'm stuck at work for most of the day so I won't be able to do any testing till later this afternoon.

However...

Just for argument's sake, let's assume both coils are shot. How would that have happened, and how can I keep it from happening again?
Click to expand...

You did not measure it correctly. It happens.
 
posplayr said:
You did not measure it correctly. It happens.
Click to expand...

I mean how did my coils go from producing spark one minute to not producing spark the next? Seems odd to me that both coils suddenly crapped out. What caused this to happen?

And if I get new coils, how can I be sure that they won't turn into garbage in the same fashion? I don't want to keep having this problem.
 
fyarl666 said:
I mean how did my coils go from producing spark one minute to not producing spark the next? Seems odd to me that both coils suddenly crapped out. What caused this to happen?

And if I get new coils, how can I be sure that they won't turn into garbage in the same fashion? I don't want to keep having this problem.
Click to expand...

I don't have any idea why you would buy new coils if here is nothing wrong with your coils. Maybe a performance upgrade. A hot spark is always a good thing.
 
fyarl666 said:
I mean how did my coils go from producing spark one minute to not producing spark the next? Seems odd to me that both coils suddenly crapped out. What caused this to happen?
Click to expand...
If you're so certain that they're bad, go ahead and replace them.
 
rustybronco said:
If you're so certain that they're bad, go ahead and replace them.
Click to expand...

I'm not certain, I'm just asking IF, they are bad (just an assumption, don't know for sure), what could cause that?

That's all I'm asking.
 
Have you ever tried diagnosing something that may never have existed? When you find which part had failed, then you can start to ascertain what caused it.
 
fyarl666 said:
I'm not certain, I'm just asking IF, they are bad (just an assumption, don't know for sure), what could cause that?

That's all I'm asking.
Click to expand...

It is highly unlikely ( virtually impossible) for two coils to suddenly "break" spontaneously . Therefore the only logical conclusion is that there is nothing wrong with them and you are just wrapped around the axle. Do the simple tests I outlined using 20vdc setting.
 
posplayr said:
It is highly unlikely ( virtually impossible) for two coils to suddenly "break" spontaneously.
Click to expand...

My originals are still functioning fine, I did replace the plug boots and wires, though. No reason to spend the $$ if you don't have to, yet.

There are always lots of OTHER things, to worry about, instead....
 
gsgeezer said:
My originals are still functioning fine, I did replace the plug boots and wires, though. No reason to spend the $$ if you don't have to, yet.

There are always lots of OTHER things, to worry about, instead....
Click to expand...

I'm just really worried it's the ignitor box cuz that would be more $$$ to replace than coils. Plus, there's no real way to test if the ignitor is good, is there?
 
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