Lynn,
 >
 > Will the old motorbike timing trick work if you modify the
 > technique? If the plug holes are symmetrical to tdc in the
 > housing, make 2 screw-in probes that extend the same depth
 > into the chamber, deep enough that the rotor cannot make it
 > to TDC. Insert the first probe, rotate the engine one
 > direction to make the rotor contact the nearest probe & mark
 > the wheel at the pointer. Remove the 1st probe rotate the
 > engine past TDC, & install the other probe. Rotate the
 > engine backward to make the rotor contact the other probe.
 > Mark the wheel at the pointer & split the difference between
 > the marks for TDC.
 >
 > I've never rebuilt a rotary, so I don't know about the plug
 > hole symmetry. If they are symmetrical, then this might be a
 > little easier to do if the engine is already mounted &
 > 'accessorize.'
 >
 > For those of us still flying Lycosaurs, the technique works
 > fine using just one probe.
 >
 > Charlie England

    The logic is sound. But the plug holes have different depths. If you
could build a plug shell up with a perfectly centered pin that will fit
through an 1/8" hole, you could rock the apex seal back and forth over the
plug hole and screw in the plug until it just touches the apex seal. Then
back the rotor up away from the plug hole and screw the special plug in, say
5 turns and bring the rotor back until it touches. Record the degree wheel
reading or make a mark under the timing pointer. Move the special plug to the
other hole and repeat as above. It would work just fine I think. A deft hand
is required around the apex seals as any damage will be costly.
Lynn E. Hanover

 
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