Well, without getting into the AC/DC theory stuff, if you have an AC circuit without a "rectifier" to change it to DC, then the bulb won't work unless you install a rectifier to convert your AC to DC. Any of the LED stuff has got to receive a DC circuit.
So I don't know what an '87 has for a circuit. Since it is not electric start, I suspect it is AC which means you'd need to add an rectifier. Check the shop manual for the specs on the electrical and it should tell you if the lighting circuit is AC or DC.
I'm guessing with out checking the '87 specs that the bulb won't work without a rectifier.