Either a manual or electric choke is an easy bolt-on swap for your hot air choke equipped carb. You basically just take out 3 little screws to remove the black plastic cap / thermostat coil assembly from the side of the carb and replace it with the manual adapter or electric thermostat from the kit.
Here's an example of a manual choke conversion kit -->
http://www.tooltopia.com/wilmar-w511c.aspx