Ok WD-40 wont hurt anything, I just rebuilt my VX-18 with it and it still runs. All WD-40 does is remove water and lubes up parts for a small time(burns off very fast)but after that the oil in the fuel will keep it all running smoth. Soak the parts with WD-40 in a baggy(keep pison separate) every once in a while or when your not going to use it for a long time.