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cant you drill the old nipple out? you can buy nipples with 0.5 oversize for this reason. You can also buy bleedable banjos, they replace the existing banjo but have a bleed nipple built in - i have fitted one and as long as you orientate the caliper correctly you can bleed them out. They look like this: if you must replace the caliper, do you know the bolt spacing? There are a number of yamahas with the same ~(i think) 83mm calipers.

Hi Mike. Welcome to the forum. If by barn find you mean it's been sitting a while, then the carbs may well have gummed up all the various jets and airways, so they'll most likely need stripping and ultrasonic cleaning. Best to clean out the fuel tank as well

7 months, bad fuel. you need to drain out the fuel in the bike and switch it for some fresh.