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emerick kish
emerick kish Posted on Dec 28, 2008
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I have 2 problems real bad vibration and igniton problems w/crane

I have a 1972 electraglide that i restored. The engine is stock except for a cam and crane ignition. first of all I am going thru coils one after the other. I lose the rear cylinder. The igniton is a crane Hi-4. The first coil lasted about a month. The second about 2 weeks. And my 3rd coil died after a weekend.I have been in contact with Crane tech and they said it may be caused by RF noise in my harness. I don't know what to look for to find this problem. Another problem that may be related is a bad vibration at speeds above 50 mph. The vibration is so bad that my foot won't stay on the floorboard! also my ignition switch stem broke. I suspect from the vibration. I am thinking these problems may be related to each other. Any help would be greatly appreciated!

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Hi and welcome to FixYa,

Pls bear with me, how is the charging system? At high rev/RPM, max battery voltage is 14.2? A runaway charging system (with a faulty regulator) would subject the electrical system to higher than normal voltage. The coil would be taking the brunt and therefore fail rather quickly.

Sorry about the vibration, without an onsite/test ride, could be anything from tires, engine mount,exhaust mount andothers.

Good luck and Thank you for using FixYa.

  • brissa_mel69
    brissa_mel69 Jul 31, 2012

    loose top motormount ..the top mount has to be secure to each head then tighten bolt to the frame

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Check and try to look if this all mentioned was correct.

  • Loose or corroded battery connections
  • Ignition module not properly grounded
  • Wheels, sprockets and or tyres damaged
  • Front or rear chain/belt badly worn or links tight as a result of insufficient lubrication
  • Upper mounting bracket loose, broken or improperly spaced
  • Lower mounting bolts loose
  • Transmission and/or transmission sub-mounting plate loose in chassis
  • Internal engine problem
  • Broken frame

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The vibration is likely a tire or rim problem and can be checked at a reputable tire shop. the RF noise is the same as like if you had a car and an amp installed in it and heard a hum in the speakers this is an example of RF noise. most likely cause is alternator, unshielded wires, or components, make sure the proper boots are over all wiring conections. also sounds like you have an intermintent short someplace in the wiring that is requiring to many amps in the ignition system. You may also try going to a hipro spark wire.

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Check wether the ignition switch module is bad and is shorting out again n again.

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