I'm going to swtich out my petcock for the raptor, but i wasn't sure what the best option for plugging the vac line into the carb was. i have 3.17 and 4.76 mm rubber caps (only could find imperial sized caps 1/4" or 3/8" i believe) as well as high temperature RTV sealant. Any other solutions? are my plugs going to be the correct fit? Should i bother using the sealant when pluggging the cap down? would gorilla glue be good solution when capping the vac port? Thanks!

The caps are from autozone (47396): https://shop.advanceautoparts.com/p/dorman-autograde-rubber-black-vacuum-cap-...

I have a 2007 S40 boulevard btw.

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Right, but I don't want to start this process and realize I cannot plug the vacuum line. I don't have a lot laying around that i could jerry right you know?

Thanks Dave, not a bad suggestion. I'll see if that works after trying my vac plugs

 I cut then folded the stock tubing over and used a small hose clamp.  

 I wouldn't use any sealant, a cap will work fine and a small clamp will make sure it doesn't go anywhere.

I ran a sheet metal screw into the hole and tried sealing it with epoxy which worked for about two years then developed a vacuum leak around the threads, took a while to figure out why the bike was making real loud pops out the exhaust and running hot. Ended up using a cap on the fitting sealed with some RTV black and didn't look back.