MF, one other thing to check is the fuel cap. I can't see it being the problem here but I had a guy bring around a late 90s PT that had been fully serviced, but would flood seriously in the shed.
After another new fuel tap, needle, etc he said the problem was solved last june. He then came back a few months ago right after we got a bout of hot days. I put 2 and 2 together - the tank wasn't venting, heat in the shed pressurised it in hot weather and forced fuel past the tap and needle.
New house, detached shed storage in lieu of cooler garage it lived in for 20 years
Everyone else who had looked previously was apparently telling him he wasn't shutting the tap, etc, but he keeps it in good nick and knows a 2 stroke - shuts it down like Paul mentioned.
Drilled out the hole in the fuel cap a bit larger, told him to disconnect fuel line and put end in a bucket and see how much (if any) comes out and tell me if there is any. Haven't seen him in the last 2 months so probably worked.
The hole was in the cap but very small and easily clogged with grass. There was a service bulletin at the time regarding poorly formed hole in a production run (wouldn't affect yours though as its older - but it is the same cap so could have been substituted).
