The starter is an obsolete part, and cannot be found at a parts dealer, online or otherwise. Your best bet IMO is to search atv salvage yards online. The starter from a 110 is has a different part #, but they are also obsolete, so it really doesn't matter much if it did fit. The engine design hasn't changed much, so there is a chance that the recoil starter off of a '93 or newer TRX 90 may fit, but you may have to use the entire mechanism, including the innermost pulley. There is also the possibility that the electric starting system off a newer chinese atv could be adapted to your motor since most of those small chinese machines use engines that are literal copies of old Honda technology. Do your research and good luck.
Yours truly, sincerelly, love always, Josh aka The DirtDemon.