My engine has had about a gallon through it and produces great power but it is not easy to keep the temp right but I do have the Schumacher one with the short head it keeps rising to 245. But maybe it's not run in yet. I was on the Picco forum and heard it needs around 2 gallons to run in fully it still pinches at the top hard. I also read that once run in you can take the thin shim out and the power goes way up. I'm running a 15 tooth clutchbell and just a normal hyper 7 pipe on 20% tornado fuel with a schumacher super cool plug. What are you running on yours and what temp do you run. Mines gives best performance at 225.