I've just replaced the carby after cleaning and replaciing o-rings. It doesn't leak. However, now I have no spark. I've removed both wires from the carby (in case they were not properly installed) - still no spark. the various wires seem ok - no broken insulation, connectors still firm.
It's a 160cc, green Conquest (I think that was its name) about 1987 vintage. The electronic module is secure - appears to be riveted on! Not sure how you'd replace it.