I think I may have a solution. Your issue lies with the magnetic switch underneath the parking brake. It's not the best of switches, and gets knocked out of alignment by dirt thrown up by the tyres (especially when you're scarifying). At least on the new C600H's, if it stops making contact, you out the brake on, then get off the seat, the engine stops. On trying to start it, you'll see a "C" in the display instead of a "P". Either simply push the switch assembly backwards by hand until until you see a "P" (then press start), get a new switch, or just short the wires (but this deactivates a safety feature). Hope this helps. br/David