Allright how bout some vids.
2 of me and 1 of my stepdad and his open tractor. First hook I turned down. moved some weight and dropped a gear. Then repulled and full pulled the sled. Beat some really good running open twins. My big 50 ran like I hoped it would. Jetting is a little lean yet. Hardley any color on the plug.
This is my full pull. 26 tooth gear with 84 inch cepeks. This engine makes a ton of torque. I'm turning a tooth or two faster then the twins pull. Not sure on rpm but its as fast as it would turn leaving the line. I figure 6500ish from the way it sounds.
This was the first hook, 27 tooth gear. Had the weight wrong.
The ole mans open twin. leaves the line at 8-8200 and runs down the track at 75-7800. 28 tooth gear. VM07's.