have heard some positive comments on the 3 prong spark plug, (w7dtc) for the
waterboxer digifant.  i have a 90 syncro with the digifant control system.
i just put in a new oxy sens at 125k miles, have installed the tornado air
device and am getting 20 mpg.  would like comments on experience with this
plug.  want to get max power and mpg.  in colorado in sept. and syncro
didn't like "rocky mtn high", frequently over 11k ft. getting to trailheads.
that was before i put in the new oxy sens, but the tornado device was in
place.  hope the new sens helps with elevation.
thanks, roger ehret, gig harbor, wa.  90 syncro westy