Hello everyone, I'm troubleshooting my mpem (no spark) manual says to bypass rev limiter by disconnecting black/red/green wire for starboard side and black/red port side wire coming from the magneto. If there's spark then the rev limiter is bad and the mpem needs to be replaced apparently a bad rev limiter will not send spark to the plug wires. My question is, does anyone know how to disconnect the wires from the connectors, I tried pulling on it and I don't want to cut it.
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testing mpem
- Thread starter esg
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timmyboy76
New Member
from what i've read, unplug wire at "coil", then turn motor, if it starts, then your mpem is bad or rev limiter is shorted, which means, mpem needs replaced. But if no spark, then either coil/s is bad or problem in stator assy...generate'n coil, ignition coil...
Tim, which wire, I am thinking the one that connects by itself to a terminal at the bottom of the coil it slides in and out its next to two ground cables secured by a nut. The shop manual says to disconnect the wire coming from the magneto harness itself, I suppose the wire at the coil does the same thing. I just can't seem to disconnect the wire from the connector and I don't want to cut and then splice just for testing purposes.
Americanamafia
New Member
for the flame arrester bolts, if they are really corroded clean off as much as you can with sandpaper and give them a good spray with penetrating oil and let them sit for a few hours and repeat. Try tapping the handle of the rachet with a mallet rather than forcing it with your hand. small taps to better than constant force
robin savell lloyd
Active Member
I do not understand as the plugs apear to be square in the parts list for a 1998 sportster.
timmyboy76
New Member
quote from reputable mod/guru.....
Unplug the black/red wire between the mpem and coil and see if it starts. If it does, you have an issue with a switch or the rev limiter in the mpem. If it doesn't, the stator or coil are the places to look. Also, if it does start with that unplugged, be prepared to kill with the choke since the stop and lanyard buttons are bypassed
I think I got the wire confused....
Chester, I agree with your procedure because I don't see how voltage is going to get to the coil if the wire is disconnected. I could be wrong and maybe the other way works the same also. An igntion coil needs a positive and a negative at the primary coil to step up the voltage in the secondary if I disconnect one of those wires I'm thinking I'll get no spark no matter what. If I'm not mistaken the voltage (AC) from the magneto harness goes to the mpem first then comes back around to the ignition coil, so it makes sense to disconnect the wire that disables the rev limiter at the magneto harness, I'll will give it a try both ways anyhow. Chester, did you give my offer some taught, about the test harness for the magneto. I tested the voltage coming from the magneto however, I don't think that I was getting good contact with the multimeter leads so I really want to either make a test harness or purchase the one already made for a reasonably price if possible.
Its the wire at the connector, not the connector itself, disconnect the connector first and then of course remove the wire from the connector as I said before I tried pulling on it but it won't come out. The shop manual says to bypass and by that it means to disconnect the black/red/green wire coming from the magneto harness for starboard engine RH and black/red wire for the port engine LH.
robin savell lloyd
Active Member
plugs [connectors] maybe you all see something that I am not seeing.I do not understand as the plugs apear to be square in the parts list for a 1998 sportster.
timmyboy76
New Member
plugs [connectors] maybe you all see something that I am not seeing.
your right, robin...in front of magneto housing, is a black box, which contains the coil, and relay, which the wires run up to a "square" plug on top of that box.
I do not understand as the plugs apear to be square in the parts list for a 1998 sportster.
Sorry, I misunderstood the question. On the square stator connector you have to remove the retainer from the connector and push the tab away from the pin.
Chester
test harness
Hi, Chester thanks for the info, that sounds easy enough. Have you taught about my offer for the two connectors?
Hi, Chester thanks for the info, that sounds easy enough. Have you taught about my offer for the two connectors?
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