Front cylinder

[Herbert L. Williams]

My front cylinder just quit firing, I have cleaned connectors, changed plugs, now looking at changing the coil. I found this one on amazon and was wondering, what do you guys think. I ride a 07 mastiff with 117ci S&S motor

https://www.amazon.com/Hi-Performance-Single-Super-Harley-Davidson-Motorcycles/dp/B00II6O2FW

 

[Marky-Marc]

How did you check for spark?

 

[Herbert L. Williams]

I switched wires on the coil to switch cylinder heads and the bike wouldn't start. I switched back and it would only start using the rear cyclinder. I didn't have am ohm meter. It being Sunday didn't have much option. Any ideas how I can check it

 

[Jersey Big Mike]

I switched wires on the coil to switch cylinder heads and the bike wouldn't start. I switched back and it would only start using the rear cyclinder. I didn't have am ohm meter. It being Sunday didn't have much option. Any ideas how I can check it

did you just switch the plug wires or did you do the small wires that control when the coil fires.
If you only did the plug wires the timing would be off drastically and I don't think it would start.

 

[Herbert L. Williams]

No I didn't switch, which wires do I switch to this. Will it make the front cyclinder fire and the not the back

 

[Herbert L. Williams]

No I didn't switch, which wires do I switch to this. Will it make the front cyclinder fire and the not the back

Dang spell check and fat fingers. I only switched the plug wires, which wired on coil do I switch to test the front cylinder

 

[Marky-Marc]

Redneck way to check for spark with no tools:

Pull front spark plug
Plug it back into spark plug wire
Ground spark plug to bike (fins or engine) with it plugged into spark plug wire off coil
Hit start and see if it sparks or you get shocked....

Yes, I've been drinking.....

 

[Th3InfamousI]

Redneck way to check for spark with no tools:

Pull front spark plug
Plug it back into spark plug wire
Ground spark plug to bike (fins or engine) with it plugged into spark plug wire off coil
Hit start and see if it sparks or you get shocked....

Yes, I've been drinking.....

I was thinking real redneck is your tongue

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[Marky-Marc]

I was thinking real redneck is your tongue

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Well Eric, it is, I said redneck, NOT 'REAL' redneck.....bwahahahaha

Cheers!

 

[Herbert L. Williams]

Redneck way to check for spark with no tools:

Pull front spark plug
Plug it back into spark plug wire
Ground spark plug to bike (fins or engine) with it plugged into spark plug wire off coil
Hit start and see if it sparks or you get shocked....

Yes, I've been drinking.....

Okay let's say, I get spark, what's the next problem it could be? Without causing electrical shock, lmao

 

[Marky-Marc]

Okay let's say, I get spark, what's the next problem it could be? Without causing electrical shock, lmao

Well, did it happen from one day to the next without any incidents? Or were/are there other issues before this started.....

 

[Marky-Marc]

Honestly, if you do have spark on the front cylinder and the rear is firing, but front isn't.....something may be wrong with your front cylinder......that's why I'm asking for more information.....

 

[Herbert L. Williams]

Honestly, if you do have spark on the front cylinder and the rear is firing, but front isn't.....something may be wrong with your front cylinder......that's why I'm asking for more information.....

I rode one day, pulled some old led lights off from the previous owner. I saw a spark from a loose wire that touch the one or the other cylinder heads. I came back to ride a few days later and I noticed the front cylinder was not working anymore.

 

[Marky-Marc]

I rode one day, pulled some old led lights off from the previous owner. I saw a spark from a loose wire that touch the one or the other cylinder heads. I came back to ride a few days later and I noticed the front cylinder was not working anymore.

Then you have a short somewhere or a bad wire/ground, you just need to trace it down, I'm going to guess then That you will NOT have spark. If you saw where the 'spark' came from when the LEDs were removed, start there....

 

[Herbert L. Williams]

Is it possible, it shorted out the coil?

 

[Th3InfamousI]

Is it possible, it shorted out the coil?

Thats possible

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[BadDawg Bill]

Redneck way to check for spark with no tools:

Pull front spark plug
Plug it back into spark plug wire
Ground spark plug to bike (fins or engine) with it plugged into spark plug wire off coil
Hit start and see if it sparks or you get shocked....

Yes, I've been drinking.....

I thought you were going to say put your tongue on the spark plug wire... Ya, he has a short or a burned out coil. Seems to be a lot of that going on these days...

 

[Jersey Big Mike]

check the three small wires going to the coil (not the spark plug wires)
there should be a blue (rear) yellow (front) and red +12v going to the coil.
If you disconnect the yellow and blue, you should be able to see spark if you ground the coil where the yellow/blue wire was on the coil assembly. This will test the coil. You could also remove power to the coil and use a DVM/voltmeter to measure the resistance of the coil on each side (red to yellow, blue to red) -- DO this OFF the bike or at least with the battery DISCONNECTED.
I believe it should be about 3ohms if memory serves me correctly.

If you don't have a voltmeter/DVM -- get one -- Harbor freight has them cheap -- frequently free or near free with coupon.

 

[Marky-Marc]

check the three small wires going to the coil (not the spark plug wires)
there should be a blue (rear) yellow (front) and red +12v going to the coil.
If you disconnect the yellow and blue, you should be able to see spark if you ground the coil where the yellow/blue wire was on the coil assembly. This will test the coil. You could also remove power to the coil and use a DVM/voltmeter to measure the resistance of the coil on each side (red to yellow, blue to red) -- DO this OFF the bike or at least with the battery DISCONNECTED.
I believe it should be about 3ohms if memory serves me correctly.

If you don't have a voltmeter/DVM -- get one -- Harbor freight has them cheap -- frequently free or near free with coupon.

You are correct, If he had a volt/ohm meter, this would be an easier task, hence the 'redneck' check with our without the tongue....lol......I'm sure he will invest in one soon.....

You can also check voltage between the terminals with the coil still on.......

 

[SKOGDOG]

BigDaddy, please post when you find the problem. Inquiring minds want to know!