> Kurt Valentine Wrote:
> -------------------------------------------------------
> Are used 150 grit sandpaper on both the head and the cylinder. And yes,
> I have a 15 mm intake to go with the carburetor.
theres likely your issue. 150 is waaaay too coarse. You need to work your way up to at least 400 grit, in stages, to remove all fine scratches. It takes time and effort, and several sheets of sandpaper. Your final sanding should be with oiled 400 grit, and leave a shiny, mirrored finish. you'll go thru at least two sheets of each grit sandpaper. Start with 180 next, then 220, 320, 400.