Installing Nemesis or Dynatech Coils and Plug-Wires

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Written by Randy Fox (Randysgym)   
Thursday, 04 October 2007

Mounting the Right-Side Coil

The right coil is mounted as a mirror image of the left one, so that the sparkplug nipples face rearward, just like the left ones.

Begin removing the right-side, stock coil by unplugging the two sparkplugs of the front cylinder.

Next, unplug the two little wires from the stock right coil. You don't have to keep track of which wire goes where--as long as you keep the wires for the right-side coil from ending up on the left coil.

Now unscrew the little bolt at the coil's rearward end.

The coil and plug-wire assembly can now be removed. Do this by swinging the bolt-end of the coil away from the bike enough to allow you to wiggle the other end rearward and out of its rubber mount.

Set the coil assembly aside.

Remove the rubber mount from the front bracket. Clean it. Then lubricate the inside of the mount with a rubber dressing or dielectric grease, and reinstall it back into its bracket.

Tip: You do not need to cut the rubber mount for the right-side coil.

Take out the other two terminal-posts from your small parts bag. Then mount them onto the coil, via the two, brass mounting screws.

As you tighten the screws, hold the terminal-posts so they are oriented out, sideways. Remember, you must orient the terminal-posts so that they point out, when the coil is mounted. See photo example below.

Next attach the remaining two sparkplug wires to the coil. Put some dielectric grease on the metal terminals inside the 90* boots, and then push a 90* boot over each of the coil’s plug-wire nipples. Push them on all the way, until you can feel the terminal snap or engage inside the coil.

Tip: I put the shortest wire on the rear-most nipple, and routed this wire to the right-side sparkplug, once the coil was mounted.

Now lubricate the short side of the coil's square mounting post with a little dielectric grease to make it easier slide in. Then install the new coil. To do this, push the short side of the square mounting post into the rubber mount. Wiggle and push the coil until you can swing it in place. It's tight, but take your time. Then line up the bolt hole in the long side of the square post with the threaded bolt bracket on the bike's frame.

Note: Yes, there are two bolt holes in the long end. The one furthest from the coil is not used for the Road Star.

Screw in and tighten the small mounting bolt. Since this coil is under some rearward tension from the rubber mount, be careful you don't cross-thread your bolt. Take your time getting the bolt cleanly started.

Push the input-wire connectors into the terminals on the coil. It makes no difference which wire goes to which terminal. However, if you are following the normal, stock convention, by wiring your right coil to the front cylinder, be sure you've got the input-wire pair that includes a white wire.

Your right coil should now look like the photo below.

 

Nemesis Coil, right, mounted, Yamaha Road Star

 

 
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