The dandys are collector items keep that in mind (parts are extremely scarce and when they pop up collectors are on it) check and make sure you have spark ( if you don't know how to do this search YouTube all engines are the same). If you have spark then clean out your carburator make sure you shine a flashlight throw the jet and that it's clear. If it still won't run do a compershon test
If it won't start after 6 or so pulls something is wrong there is no reason to keep yanking on it if you brake the pull starter it's over a and it's going to be extremely hard to find another one!!!
Faster then a speeding E Revo