The Hyperion at DLR and I was squeezed in by a triple pooh lady, oh the pain of them seats. I am more top heavy and over all stuffed. My friend who was "way skinnier" woud get stuck in turnstiles and have to do the tiptoes dance through the turnstiles. My neighbor had problems with the Maliboomer and other drop down rides as he was barrel chested and tall yet seat belts were no problem.
It is not your weight except on some rides like the Orange Stinger. It is your body shape and advice depends on that shape. Pirates and Small world do not let you stretch your legs out like in a theater. I have had more than one Jungle Cruise knee to knee with someone but usually you can work that out. Long legged persons need to watch out for the rides that have solid backs like Pirates. I did fine on Barnstormer at DLR but it was a bit small but you should be fine as it is a short ride.
Once I was stuck on Screamin at DCA and we all had to wait for an E stop to be over. I was fine as I love to have a loose harness and I brought water and had a snack in my bag. The guys a couple rows back were complaining as they were getting cramped from the long wait as they has long legs. I am short and prepared, lol. Must have been there 15 minutes, lol, or more but I did not care. Bathroom, snacks, water and get comfortable just in case.
You will be fine.