I have converted two 23cc weed eaters to RC and they work very well. the most difficult part was to fabricate a prop adapter. Yes they are somewhat heavy but on many old style bipes, you need that extra weight up front. Unless you have a lot of time or just like to experiment, buying one of the newer commercial units will save you a lot of time and aggravation though as the cost savings of converting a weed eater is highly problematically..