Actually, I find that the choke is really useful on my TT91FS in a P51 Mustang because I don't run a muffler. Without the choke I'd never get the damned thing started because I'd never get it wet enough. With a muffler you can just put your finger of the exhaust and turn the motor over a few times so that the pressure pushes the fuel to the carby but without a muffler that just won't work.