It's funny, but it's the exact opposite. My bike ran like a 4 stroke, meaning it had AWESOME bottom end and pulled hard all the way through. I am in the middle of a rebuild right now. I will be using a 38mm on my motor set up. That just gives you an idea of how much bottom end it had. The 36mm carb I have was only in production for a couple years. It's a quad vent, non air striker, pwk, 36mm. Looking forward to the 38mm I:I