Yes you can, one of my GS .21 B01 has a pullstart and it's handy to have both. starter box in the pits and a pullstart anywhere else (backyard bashing, in the middle of the track, etc.). What many argue is the downside of having a pullstarter is that it causes some drag in the crank which looses horsepower. I personally don't really agree to most motors except for certain motors that a one way bearings would affect the crank designed for speed and racing such as the Hyper 21 8P and race.