We typically recommend Ironwood Pacific tiller extensions.

We do not currently make a tiller extension, but we haven't found any Tiller Extensions on the market that are incompatible with our motors. 

When searching and choosing one, please find one that can accommodate a handle diameter of 1.5". In the event you purchase one, and the tiller clasp is just a little small, you can remove the rubber sheath inside the tiller extension clasp to allow it to fit. These come in several different versions with options for length and the angle at which they can be used. Hopefully, this helps!