coil/ignition issue(s)
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Cruiser
Joined: Feb 2009
Posts: 195
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From: Rockland County NY.
coil/ignition issue(s)
Greetings,
I have totally rewired my 89 fxr ignition..Harness, rotor, sensor, plug wires, module..All stock..SE Coil # 31653-97.
I have been getting misfiring and have not been able to time it.
My rpms (using electronic timing light, no tach on bike) were crazy..jumping from 1300 to 2500 and everywhere inbetween (just the tach, not the bike)..I pulled and tested my brand new SE coil per the service manual directions and am good across the primary (range 2.5 - 3.1, actual 2.6 ohms). I checked the secondary ( range 11,250-13,750, actual ZERO ohms and no continuity).
I have confirmed that the coil is the reccommended coil for the bike, I have double checked wiring to the primary and all seems right...Yet the secondary tests as no good.
I assume I could have gotten a bad coil straight out of the pack (wouldn't be a Moco first) but was hoping to get some advice here.
FYI: Testing was performed using two different Fluke muti-meters.
Timing light accuracy was checked on my 2011 FLHX and was dead on with my tach.
Now, to close out with a timing question...On a dual fire system, how can rpms be accurately read through a plug wire when 50% of the spark being detected is 'wasted' spark?
I also posted this over at the tech section..I hope doing so is not a protocol violation.
Thanks for any advice/input you may be able to offer.
D
I have totally rewired my 89 fxr ignition..Harness, rotor, sensor, plug wires, module..All stock..SE Coil # 31653-97.
I have been getting misfiring and have not been able to time it.
My rpms (using electronic timing light, no tach on bike) were crazy..jumping from 1300 to 2500 and everywhere inbetween (just the tach, not the bike)..I pulled and tested my brand new SE coil per the service manual directions and am good across the primary (range 2.5 - 3.1, actual 2.6 ohms). I checked the secondary ( range 11,250-13,750, actual ZERO ohms and no continuity).
I have confirmed that the coil is the reccommended coil for the bike, I have double checked wiring to the primary and all seems right...Yet the secondary tests as no good.
I assume I could have gotten a bad coil straight out of the pack (wouldn't be a Moco first) but was hoping to get some advice here.
FYI: Testing was performed using two different Fluke muti-meters.
Timing light accuracy was checked on my 2011 FLHX and was dead on with my tach.
Now, to close out with a timing question...On a dual fire system, how can rpms be accurately read through a plug wire when 50% of the spark being detected is 'wasted' spark?
I also posted this over at the tech section..I hope doing so is not a protocol violation.
Thanks for any advice/input you may be able to offer.
D
Seasoned HDF Member
Joined: Aug 2007
Posts: 8,198
Likes: 3,087
From: NW AR
The tach needs to take into account that you are running waste spark, so you would divide the displayed RPM by 2. Why it is jumping around, well, I dunno there. Could be misfiring or not picking up the signal, etc. And if the bike is misfiring, that's why the RPM display is jumping around. Make sure your +12 to the coil is good and clean.
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