browng300,
Yep, thats what I reckon too. May need to be a little richer in the air. Will check out the regulator hole and shift it to the rear of the carby. It seems nice and powerful but haven't tached it yet. Saw model number is CS451VL.

mikelapaz,
The carby spacer is actually molded that way with webbing instead of being solid which is nice. The engine cases were cut from the original saw cases, then trimmed down and painted with heat proof paint. You have had a good look at the photos to pick up the studs holding the pickup assembly. The studs were a part of the cases. Where I have mounted the pickup assembly, the points ignition plate was mounts, being held by these studs. They were also used to adjust the points gap. It worked out well for me.