I like the Tigre's too. I bought a 20 dollar used 51 off of eBay and it runs like a top. Have used them for decades in Stunt.They just take a touch more adjustment of the carbs than an OS. I love to hear the Chinese vs Italian debate. My buddy blueprints ST's and says the manufacturing equipment was more accurately installed in China as the pistons and liners are now round instead of egg shaped!
My dad runs a couple of ST 61's and they are some of his favorites.
Chris...