I still stand by STS, the cranks blowing just show how much insane RPM it puts out compared to the other .28's through .32's. I dunno how you could have such bad luck with yours... I still have to put some more fuel through mine before I shim it and I really start pushing it. Not to mention Ill be modding it as soon as I get a dremel, I love mine Best $170 Ive ever spent on an engine/pipe combo[8D] Hopefully the new O.S. .28 wont be a turd like its big brother