Not worst but definately most pinch ever. It really needs to be babied for the first 10 tanks or so and needs lots of attention at least that has been my Expierience, but it's not fair to give an overall opinion yet because it's still in the "bitch" stage. This may turn out to be the perfect buggy engine and the price is unbeatable. I'm getting reports from customers of 8+ gallons on all original parts also. I should have it on the track on 5/12 for a really good testing with almost a gallon of fuel through it at that point.