your comment on the weedeater needing flywheel weight to pull a prop seems to make for a good question,i have seen on here that with the fly wheel left on, a smother runing engine at idle is noticed. i would not say the same for a zdz or others as these motors are made for rc. weedeater,chain saw and other conversion engines are not built for rc but we are trying to make them work as per a cost saving factor and also so of us just like to tinker and make things work. maby if the flywheel is left on and still use the ch or whut ever conversion it would run very well,i think its worth a try,and yes the engine may spool up a little slower but whut ever,arnie...