Wirespokes has the best method, I think, but the bike also has to be in good tune with adjusted carbs/choke or you've got little chance. As mentioned, these kickers on the 70s-> airheads have a tendency to break teeth on the short spur inside the transmission - if your electric leg is working, I'd use that and save the kicker for "dire emergencies" and for setting valve lash, etc. but not constant/frequent use.