Small Aircraft
Flight Crew Private
Flight Crew Last 90 Days 15; Flight Crew Total 1500; Flight Crew Type 400
Conflict Ground Conflict; Critical; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Vehicle
Flight Crew Took Evasive Action
Human Factors; Environment - Non Weather Related; Airport; Procedure
Taking off Runway 17 (North End) of 1K1 airport. Lots of activities at the airport during the fly-in. Folks walking across North ditch to gain access to the restaurant. Performed run-up and check list between North end and fuel service area (staying clear not to prop blast pedestrians walking through the ditch on the North end. Started take-off roll full power; lifted tail wheel... and just then I see a motorcycle take off down the left (East side of the runway).  I'm at full power flying a 450hp tail dragger. Not an option to just chop the power. I pulled over to the right side (West) of the runway and continued the take-off. After reaching 60 knots lifted off gaining speed and began climb out just past mid-field. Continued following West edge of runway in case emergency procedures were required (engine failure). There was zero coordination or expectation of a motorcycle jumping out on the runway. I handled the situation as safely as possible maintaining distance but also gaining speed for climb out. I believe I made the safest choice to maintain visibility (Cowling of a 450hp tail dragger); continue gaining airspeed and then maintaining a steady climb out with options if failures were to happen.
Pilot reported taking evasive action on the take-off roll when they encountered a motorcycle on the runway.