I agree Max - those ones don't have a choke plate in the carby - just the rod and another enrichment method
The later ones have a too large hole in the choke plate - I cover half with epoxy and they start easy - otherwise 5-10 pulls
Or get a replacement where the hole is way too small and the trimmer floods on the very first pull. Been there once. Should had to modify a new carburetor but I did to get it work right.
