looks to me like you have a bicycle chain breaker and not a motorcycle one. Lezyne as far as i know only makes bicycle parts. moped chain (except the pedal side on some bikes with a separate pedal chain) is a different size. significantly so.
search google for how to break a bicycle chain if you're trying to use this on a pedal chain
i assume you mean the drive chain since it's got a masterlink. for that you'll need a motorcycle chain breaker like the motionpro one from 1977mopeds.
if you're careful not to push the pin all the way out, sometimes you can use a chainbreaker to add links as well.
alternatively you can file off the end of the pin on the chain and pound it through to shorten the chain. you can't put links onto a chain this way