50cc holeshot chain replacement

[nlalaboy]

I am trying to swap chains on a syxmoto holeshot 50cc.
I have the new chain but it needs to be broken and my chain breaker oin id to thick to do the job.
Can some advise about the correct tool with the correct diameter pin or if there is another way to do this which I was not able to figure out.
Could not find any youtube video either.
thank you in advance