Stutter under 3000rpm, HELP!
So I think I might have found the more technical explanation for the 3000rpm issue. Your petcock is a vacuum petcock system and if the diaphragm seal on the inside gets a hole rip or tear your vacuum hose will suck air from the petcock into your #1 cylinder and throw off your low rpm air/fuel mixture. I think this is the issue. I will know for a fact later tonight or tomorrow tho.
Any update? I'm kinda curious to see how this works out. I have an F3 with a similar problem though not as pronounced and it doesn't cause me any issues while riding. Just enough to hear it. A friend of mine does have an F2, though and his sounds exactly like the rest of you. Mine has a slightly taller profile cam, so mine could just be a slight lope and I always assumed his was too, but this could indicate other issues that would be nice to look into.


