I'm sure this has been beaten to death but I couldn't find anything with a search that nailed it down for me. The question is: When are 'marine' rated parts (carb, ignition, ect) required? The answer seems obvious but some have stated that you only need them with enclosed motors. Smokin Lowrider dropped some great quotes from the regs (if you could post those again it would be awesome) that back up the enclosed engine theory. But there seems to be some exceptions in them that don't quite fit. Bottom line........do I need to pony up for the 'marine' grade parts or not?