RebelSkyRot
New Member
I've looked around on here and the SOHC4 forum a bit and found a few tutorials, mostly text, on how to replace a spark plug wire on a sealed coil. My bike is a '74 CB750 which has these sealed coils. I figured I might as well post how I'm trying to fix my situation so here goes. The three methods I've come across so far on the forums are:
A) Strip back the plug wire that's too short and install an NGK splicer and new plug wire.
B) Cut off the wire at the coil, drill into the coil, shove in a copper rod/wire and attach your new wire to the other end, sealing the connections with epoxy or the sort.
C) Cut the top off the coil where the plug wire is recessed into with a dremel, lay in your new wire, and seal the whole thing with epoxy.
Those descriptions aren't too in depth and if you're interested in them just search for "coil wires" on the SOHC4 forum, that's where I got them.
Anyway, one of my spark plug wires is now too short, after the PO must have cut it back some, that I'm not getting much any spark on my #2 cylinder. To remedy this, I went and picked up some 14g copper wire, spark plug wire, and epoxy intending to do the method described in part B).
I figured that before I go cutting it all off and drilling into my coil that I might as well try stripping the wire back and soldering on a length of new wire and give it a shot.
Wire from coil stripped back.
New wire twisted together with wire from coil.
New length soldered on.
For the time being I wrapped the connection in electrical tape. Tomorrow I'll put it back on the bike and see how it works out. If all goes well I'll take off the electrical tape and make it look pretty with a few layers of heat shrink. If for some reason this doesn't work, I'll revert to my original plan of drilling into the coil and going that route. If that doesn't work I'll do method C). If that doesn't work, screw it I'll eat the $50 for new coils. By the way, the new spark plug wire I'm using is BWD 7mm plug wire part #MW11 I got from O'Reilly's for $0.69 a foot.
A) Strip back the plug wire that's too short and install an NGK splicer and new plug wire.
B) Cut off the wire at the coil, drill into the coil, shove in a copper rod/wire and attach your new wire to the other end, sealing the connections with epoxy or the sort.
C) Cut the top off the coil where the plug wire is recessed into with a dremel, lay in your new wire, and seal the whole thing with epoxy.
Those descriptions aren't too in depth and if you're interested in them just search for "coil wires" on the SOHC4 forum, that's where I got them.
Anyway, one of my spark plug wires is now too short, after the PO must have cut it back some, that I'm not getting much any spark on my #2 cylinder. To remedy this, I went and picked up some 14g copper wire, spark plug wire, and epoxy intending to do the method described in part B).
I figured that before I go cutting it all off and drilling into my coil that I might as well try stripping the wire back and soldering on a length of new wire and give it a shot.
Wire from coil stripped back.
New wire twisted together with wire from coil.
New length soldered on.
For the time being I wrapped the connection in electrical tape. Tomorrow I'll put it back on the bike and see how it works out. If all goes well I'll take off the electrical tape and make it look pretty with a few layers of heat shrink. If for some reason this doesn't work, I'll revert to my original plan of drilling into the coil and going that route. If that doesn't work I'll do method C). If that doesn't work, screw it I'll eat the $50 for new coils. By the way, the new spark plug wire I'm using is BWD 7mm plug wire part #MW11 I got from O'Reilly's for $0.69 a foot.
