Re: Removing tank vent on 87 1100
For the smaller, non-CA vent I use 2 sections of weld rod or similar rod to fit into 2 of the ventcheck scallops then use a visegrip on the rods to turn the vent out in normal lefty-loosy (CCW) direction. Do not touch the vent with the visegrip or any other tools - it appears to be potmetal and marks very easily. Most come out easily but if it seems very tight, spray the thread area with liquid wrench or WD40 and let sit for a day. If you have to force it, it may twist off and require an easyout or drilling it out which is doable - remember to wash the subchamber out and blow it out after! If it was put in without copper grease it may be seized.
Cleaning - if not obviously rust-caked inside, it doesn't necessarily need to be coated; just remove & seal petcock and vent holes(silicone the bolt threads!), fill tank to brim with CLR or rad cleaner, let sit for a day with occasional sloshing to move any rust off surfaces, drain and follow with gasline antifreeze rinse(s). Biggest prob in Calgary is getting rid of the used CLR (down a drain followed by water) or rad cleaner (gas station or hazardous disposal). Oh - and make sure the tank is sitting on a sealed surface, like a plastic or rubber drainage tank, as any leaks will chew up your concrete floor! Easypeasy!