Ignition Coil outside of specs

MCPhotographer · May 9th, 2018, 02:09 PM

So the manual states:

Standard: Primary windings 2.1 ∼ 3.2 Ω (× 1 Ω)

Secondary windings 10 ∼ 16 kΩ (× 1 kΩ)

I'm at 3.3 for the primary and 19.18 on the secondary (I'm assuming my readings are correct from my cheap Harbor Freight multimeter).

Readings are essentially the same on both sides. Seeing as how I'm out of spec how much is this going to affect the rideability of the bike and should I replace the coils?

DannoXYZ · May 9th, 2018, 02:35 PM

Close enough, should be fine.
Is bike running OK?

Triple Jim · May 9th, 2018, 02:52 PM

For low readings, you need to subtract out the resistance of the meter leads. Touch the probes together and wait for the reading to stabilize, and then note it. Then measure a coil, and subtract the noted reading from what's on the display to get the actual resistance.

There's no such trick for the secondary, but if they're near each other, I would assume they're both OK, since it's unlikely that both would fail in such a similar way, at the same time.

MCPhotographer · May 9th, 2018, 05:26 PM

Thanks for the replies. Bike is not running ok. Basically getting surges while riding. After trying a series of things I'm looking at the electrical. It seems to be ok. Having difficulty balancing the carbs. I'm back where I started, which is at the carbs.

Triple Jim · May 9th, 2018, 09:18 PM

Surging is almost certainly lean carburetors. Is your airbox system intact and connected without leaks?

DannoXYZ · May 9th, 2018, 11:08 PM

Cracked and leaky vacuum hoses can also mess up carbs as well.

May 9th, 2018, 02:09 PM	#1
MCPhotographer ninjette.org member Name: Sarge Location: Los Angeles Join Date: Jan 2014 Motorcycle(s): EX 250, 06 CBR 1000, Duc 848, 100yr Road King, VTX 1300 Posts: 35	Ignition Coil outside of specs So the manual states: Standard: Primary windings 2.1 ∼ 3.2 Ω (× 1 Ω) Secondary windings 10 ∼ 16 kΩ (× 1 kΩ) I'm at 3.3 for the primary and 19.18 on the secondary (I'm assuming my readings are correct from my cheap Harbor Freight multimeter). Readings are essentially the same on both sides. Seeing as how I'm out of spec how much is this going to affect the rideability of the bike and should I replace the coils?

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May 9th, 2018, 02:35 PM	#2
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	Close enough, should be fine. Is bike running OK?

May 9th, 2018, 02:52 PM	#3
Triple Jim Guy Who Enjoys Riding Name: Jim Location: North Carolina Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot. MOTM - Oct '18, Aug '17, Aug '16	For low readings, you need to subtract out the resistance of the meter leads. Touch the probes together and wait for the reading to stabilize, and then note it. Then measure a coil, and subtract the noted reading from what's on the display to get the actual resistance. There's no such trick for the secondary, but if they're near each other, I would assume they're both OK, since it's unlikely that both would fail in such a similar way, at the same time.

May 9th, 2018, 05:26 PM	#4
MCPhotographer ninjette.org member Name: Sarge Location: Los Angeles Join Date: Jan 2014 Motorcycle(s): EX 250, 06 CBR 1000, Duc 848, 100yr Road King, VTX 1300 Posts: 35	Thanks for the replies. Bike is not running ok. Basically getting surges while riding. After trying a series of things I'm looking at the electrical. It seems to be ok. Having difficulty balancing the carbs. I'm back where I started, which is at the carbs.

May 9th, 2018, 09:18 PM	#5
Triple Jim Guy Who Enjoys Riding Name: Jim Location: North Carolina Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot. MOTM - Oct '18, Aug '17, Aug '16	Surging is almost certainly lean carburetors. Is your airbox system intact and connected without leaks?

May 9th, 2018, 11:08 PM	#6
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	Cracked and leaky vacuum hoses can also mess up carbs as well.