have a da50 with about 1.5 gals of 32:1 ashless fuel through it ran great till 1 day it would not start . spark plug was soaked put in new one ,same prob. i can turn motor over with out plug it seems to fire most of the time .can i buy i spare ignition sys? can't handle any one else asking how much does one cost that runs? plus my arm is going to fall off? help!