I went to the drag track friday for the first time and my best run in the 1/8 mile was 9.376 seconds and 73.13 mph. My sprockets are 14/42 and my rear tires are 20 inch knobbies. My reaction times were horrible. My best was .477 seconds. Whats your guys recommendations? I'm getting to the end of fifth gear at the 1/8 th mile.