Gizmo, the following brands are frequently advertized as suitable for 2 and 4 stroke, providing there are only 2 magnets on the flywheel:SIG-01 (the one in your link), NOVA-II, and the almost identical STENS.
Some of these newer ones are said to be able to detect the correct moment to spark the instant the flywheel magnets rotate past the coil. So technically the timing should be the same as with points and condensor. Why it is not on some engines using some brands of ignition modules is a mystery to me. Perhaps the few I have experimented with in the past were all faulty. I bought mine from ebay and worry a bit that unscrupulous people may have tried these modules and wired them incorrectly, thus frying the circuitry, and then sent them back to the seller for a refund. One would assume the seller would not re-sell potentially faulty returned products like these, or at least test them... but this is ebay we are talking about! I am sure I could not have been so unlucky as to purchase 3 faulty ignition modules all at once, but I guess this is not outside the bounds of probability.
