Can't get it started now.
Here is what I have done:
New float needle in carby
Added 2 brass washers to carby in an attempt to provide idle adjustment
Dismantled and thoroughly cleaned carby
Cleaned points and checked gap, OK at 0.50mm,(have new set of points but not installed yet)
Checked de-compressor and it seems OK
New CJ8 spark plug with gap set to 0.635 mm
New air filter
New muffler and washer
New fuel pipe from tank to carby
New set of blades.
Have spark at plug, but haven't been able to get it to fire.
Throttle cable seems changed, maybe due to adding 2 washers in carby.
Maybe flooded, so will try again tomorrow.
Styx