We had the 4 cylinder kit as well-the fit and finish on the pieces was terrible. The kit came with a dc motor that was supposed to drive the whole thing, but none of the gears meshed. The distributor was also supposed to turn and light up the led "spark plugs" in time.
I saw my science teacher at the time had the same kit, neatly assembled and working. He told me he bought it as Kay-Bee as a closeout, with the caveat that the wiring instructions were wrong, and that it would take some work to get it going. He said it was a real bear to make it work, but it did in the end.
Even though I was disappointed in mine not working, I learned a LOT about how an engine works thanks to that kit, so ultimately it was worth it.
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