I don't have a super rat, but I know my cover doesn't have any vent holes in it, and I don't seem to see any in the pictures provided in this thread? I know this system with the entire CDI under the cover is quite a bit different than what the rest of us are running, on a regular HT motor getting moisture under the cover is a bigger threat than heat.the cover has air vents from the factory to keep it cool. heat will kill a cdi.
I don't think the stock cover has vent holes but not sure cause I've never had a super rat and there wasn't a picture from every angle. I suppose the cdi with the built in magneto coil would make the ignition less susceptible to moisture but more susceptible to heat, so it makes sense to have the vent holes (and the fan fins)...Holey billet Super Rat mag cover sold by Sick Bike Parts.
A regular CDI is sealed and pretty much water proof, this new CDI with built in coil looks to be sealed up in a similar manner so I guess it's all waterproof under the magneto cover on the super rat. So it would seem spacers should be ok, but I would prob just grind the fan fins down until they didn't rub the cover when the gasket is missing....That may be why there was no gasket available for a Super Rat! It's hard to seal vent holes...
I only ride in when it's dry, so I can keep the shims in for a little while. Thanks to everyone for their input!